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// ========== Copyright Header Begin ==========================================
// 
// OpenSPARC T1 Processor File: sparc_ffu_ctl.v
// Copyright (c) 2006 Sun Microsystems, Inc.  All Rights Reserved.
// DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.
// 
// The above named program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License version 2 as published by the Free Software Foundation.
// 
// The above named program is distributed in the hope that it will be 
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
// 
// You should have received a copy of the GNU General Public
// License along with this work; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
// 
// ========== Copyright Header End ============================================
////////////////////////////////////////////////////////////////////////
/*
//  Module Name: sparc_ffu_ctl
//      Description: This is the ffu control block.
*/
 
/*
/* ========== Copyright Header Begin ==========================================
*
* OpenSPARC T1 Processor File: iop.h
* Copyright (c) 2006 Sun Microsystems, Inc.  All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.
*
* The above named program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License version 2 as published by the Free Software Foundation.
*
* The above named program is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* ========== Copyright Header End ============================================
*/
//-*- verilog -*-
////////////////////////////////////////////////////////////////////////
/*
//
//  Description:        Global header file that contain definitions that
//                      are common/shared at the IOP chip level
*/
////////////////////////////////////////////////////////////////////////
 
 
// Address Map Defines
// ===================
 
 
 
 
// CMP space
 
 
 
// IOP space
 
 
 
 
                               //`define ENET_ING_CSR     8'h84
                               //`define ENET_EGR_CMD_CSR 8'h85
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
// L2 space
 
 
 
// More IOP space
 
 
 
 
 
//Cache Crossbar Width and Field Defines
//======================================
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
//bits 133:128 are shared by different fields
//for different packet types.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
//End cache crossbar defines
 
 
// Number of COS supported by EECU 
 
 
 
// 
// BSC bus sizes
// =============
//
 
// General
 
 
 
 
// CTags
 
 
 
 
 
 
 
 
 
 
 
 
 
// reinstated temporarily
 
 
 
 
// CoS
 
 
 
 
 
 
// L2$ Bank
 
 
 
// L2$ Req
 
 
 
 
 
 
 
 
 
 
 
 
 
// L2$ Ack
 
 
 
 
 
 
 
 
// Enet Egress Command Unit
 
 
 
 
 
 
 
 
 
 
 
 
 
 
// Enet Egress Packet Unit
 
 
 
 
 
 
 
 
 
 
 
 
 
// This is cleaved in between Egress Datapath Ack's
 
 
 
 
 
 
 
 
// Enet Egress Datapath
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
// In-Order / Ordered Queue: EEPU
// Tag is: TLEN, SOF, EOF, QID = 15
 
 
 
 
 
 
// Nack + Tag Info + CTag
 
 
 
 
// ENET Ingress Queue Management Req
 
 
 
 
 
 
 
 
 
 
 
 
// ENET Ingress Queue Management Ack
 
 
 
 
 
 
 
 
// Enet Ingress Packet Unit
 
 
 
 
 
 
 
 
 
 
 
 
// ENET Ingress Packet Unit Ack
 
 
 
 
 
 
 
// In-Order / Ordered Queue: PCI
// Tag is: CTAG
 
 
 
 
 
// PCI-X Request
 
 
 
 
 
 
 
 
 
 
 
// PCI_X Acknowledge
 
 
 
 
 
 
 
 
 
 
 
//
// BSC array sizes
//================
//
 
 
 
 
 
 
 
 
 
 
 
 
// ECC syndrome bits per memory element
 
 
 
 
//
// BSC Port Definitions
// ====================
//
// Bits 7 to 4 of curr_port_id
 
 
 
 
 
 
 
 
// Number of ports of each type
 
 
// Bits needed to represent above
 
 
// How wide the linked list pointers are
// 60b for no payload (2CoS)
// 80b for payload (2CoS)
 
//`define BSC_OBJ_PTR   80
//`define BSC_HD1_HI    69
//`define BSC_HD1_LO    60
//`define BSC_TL1_HI    59
//`define BSC_TL1_LO    50
//`define BSC_CT1_HI    49
//`define BSC_CT1_LO    40
//`define BSC_HD0_HI    29
//`define BSC_HD0_LO    20
//`define BSC_TL0_HI    19
//`define BSC_TL0_LO    10
//`define BSC_CT0_HI     9
//`define BSC_CT0_LO     0
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
// I2C STATES in DRAMctl
 
 
 
 
 
 
 
//
// IOB defines
// ===========
//
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
//`define IOB_INT_STAT_WIDTH   32
//`define IOB_INT_STAT_HI      31
//`define IOB_INT_STAT_LO       0
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
// fixme - double check address mapping
// CREG in `IOB_INT_CSR space
 
 
 
 
 
 
 
 
 
 
// CREG in `IOB_MAN_CSR space
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
// Address map for TAP access of SPARC ASI
 
 
 
 
 
 
 
 
 
 
 
 
 
//
// CIOP UCB Bus Width
// ==================
//
//`define IOB_EECU_WIDTH       16  // ethernet egress command
//`define EECU_IOB_WIDTH       16
 
//`define IOB_NRAM_WIDTH       16  // NRAM (RLDRAM previously)
//`define NRAM_IOB_WIDTH        4
 
 
 
 
//`define IOB_ENET_ING_WIDTH   32  // ethernet ingress
//`define ENET_ING_IOB_WIDTH    8
 
//`define IOB_ENET_EGR_WIDTH    4  // ethernet egress
//`define ENET_EGR_IOB_WIDTH    4
 
//`define IOB_ENET_MAC_WIDTH    4  // ethernet MAC
//`define ENET_MAC_IOB_WIDTH    4
 
 
 
 
//`define IOB_BSC_WIDTH         4  // BSC
//`define BSC_IOB_WIDTH         4
 
 
 
 
 
 
 
//`define IOB_CLSP_WIDTH        4  // clk spine unit
//`define CLSP_IOB_WIDTH        4
 
 
 
 
 
//
// CIOP UCB Buf ID Type
// ====================
//
 
 
 
//
// Interrupt Device ID
// ===================
//
// Caution: DUMMY_DEV_ID has to be 9 bit wide
//          for fields to line up properly in the IOB.
 
 
 
//
// Soft Error related definitions 
// ==============================
//
 
 
 
//
// CMP clock
// =========
//
 
 
 
 
//
// NRAM/IO Interface
// =================
//
 
 
 
 
 
 
 
 
 
 
//
// NRAM/ENET Interface
// ===================
//
 
 
 
 
 
 
 
//
// IO/FCRAM Interface
// ==================
//
 
 
 
 
 
 
//
// PCI Interface
// ==================
// Load/store size encodings
// -------------------------
// Size encoding
// 000 - byte
// 001 - half-word
// 010 - word
// 011 - double-word
// 100 - quad
 
 
 
 
 
 
//
// JBI<->SCTAG Interface
// =======================
// Outbound Header Format
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
// Inbound Header Format
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
//
// JBI->IOB Mondo Header Format
// ============================
//
 
 
 
 
 
 
 
 
 
 
 
 
 
 
// JBI->IOB Mondo Bus Width/Cycle
// ==============================
// Cycle  1 Header[15:8]
// Cycle  2 Header[ 7:0]
// Cycle  3 J_AD[127:120]
// Cycle  4 J_AD[119:112]
// .....
// Cycle 18 J_AD[  7:  0]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
module sparc_ffu_ctl (/*AUTOARG*/
   // Outputs
   ffu_exu_rsr_data_mid_m, ffu_exu_rsr_data_lo_m,
   ffu_exu_rsr_data_hi_m, ctl_vis_subtract, ctl_vis_sel_log,
   ctl_vis_sel_align, ctl_vis_sel_add, ctl_vis_log_sel_xor,
   ctl_vis_log_sel_pass, ctl_vis_log_sel_nor, ctl_vis_log_sel_nand,
   ctl_vis_log_pass_rs2, ctl_vis_log_pass_rs1,
   ctl_vis_log_pass_const, ctl_vis_log_invert_rs2,
   ctl_vis_log_invert_rs1, ctl_vis_log_constant, ctl_vis_cin,
   ctl_vis_align_odd, ctl_vis_align6, ctl_vis_align4, ctl_vis_align2,
   ctl_vis_align0, ctl_vis_add32, ctl_dp_wsr_data_w2, ctl_dp_thr_e,
   ctl_dp_gsr_wsr_w2, so, ctl_dp_rst_l, ffu_ifu_fpop_done_w2,
   ffu_ifu_cc_vld_w2, ffu_ifu_cc_w2, ffu_ifu_tid_w2,
   ffu_ifu_stallreq, ffu_ifu_ecc_ce_w2, ffu_ifu_ecc_ue_w2,
   ffu_ifu_err_reg_w2, ffu_ifu_err_synd_w2, ffu_ifu_fst_ce_w,
   ffu_lsu_kill_fst_w, ffu_ifu_inj_ack, ffu_lsu_data,
   ffu_lsu_fpop_rq_vld, ffu_lsu_blk_st_va_e, ffu_lsu_blk_st_e,
   ffu_tlu_trap_ieee754, ffu_tlu_trap_other, ffu_tlu_trap_ue,
   ffu_tlu_ill_inst_m, ffu_tlu_fpu_tid, ffu_tlu_fpu_cmplt,
   ctl_frf_ren, ctl_frf_wen, ctl_frf_addr, ctl_dp_fp_thr,
   ctl_dp_fcc_w2, ctl_dp_ftt_w2, ctl_dp_exc_w2, ctl_dp_ecc_sel_frf,
   ctl_dp_output_sel_rs1, ctl_dp_output_sel_rs2,
   ctl_dp_output_sel_frf, ctl_dp_output_sel_fsr, ctl_dp_rs2_frf_read,
   ctl_dp_rs2_sel_vis, ctl_dp_rs2_sel_fpu_lsu, ctl_dp_rs2_keep_data,
   ctl_dp_rd_ecc, ctl_dp_fsr_sel_ld, ctl_dp_fsr_sel_fpu,
   ctl_dp_fsr_sel_old, ctl_dp_noshift64_frf, ctl_dp_shift_frf_right,
   ctl_dp_shift_frf_left, ctl_dp_zero_low32_frf, ctl_dp_new_rs1,
   ctl_dp_sign, ctl_dp_flip_fpu, ctl_dp_flip_lsu, ctl_dp_noflip_fpu,
   ctl_dp_noflip_lsu, ctl_frf_write_synd,
   // Inputs
   ifu_tlu_sraddr_d, exu_ffu_wsr_inst_e, exu_ffu_gsr_scale_m,
   exu_ffu_gsr_rnd_m, exu_ffu_gsr_mask_m, exu_ffu_gsr_align_m,
   dp_ctl_gsr_scale_e, dp_ctl_gsr_mask_e, rclk, si, se, grst_l,
   arst_l, rst_tri_en, dp_ctl_rs2_sign, cpx_vld, cpx_fcmp, cpx_req,
   cpx_fccval, cpx_fpexc, dp_ctl_fsr_fcc, dp_ctl_fsr_rnd,
   dp_ctl_fsr_tem, dp_ctl_fsr_aexc, dp_ctl_fsr_cexc,
   dp_ctl_synd_out_low, dp_ctl_synd_out_high, ifu_ffu_fpop1_d,
   ifu_ffu_fpop2_d, ifu_ffu_visop_d, ifu_ffu_fpopcode_d,
   ifu_ffu_frs1_d, ifu_ffu_frs2_d, ifu_ffu_frd_d, ifu_ffu_fld_d,
   ifu_ffu_fst_d, ifu_ffu_ldst_single_d, ifu_ffu_tid_d,
   ifu_ffu_fcc_num_d, ifu_ffu_mvcnd_m, ifu_ffu_inj_frferr,
   ifu_exu_ecc_mask, ifu_ffu_ldfsr_d, ifu_ffu_ldxfsr_d,
   ifu_ffu_stfsr_d, ifu_ffu_quad_op_e, ifu_tlu_inst_vld_w,
   lsu_ffu_flush_pipe_w, ifu_tlu_flush_w, lsu_ffu_ack,
   lsu_ffu_ld_vld, lsu_ffu_bld_cnt_w, dp_ctl_ld_fcc, ifu_exu_nceen_e,
   ifu_exu_disable_ce_e, lsu_ffu_blk_asi_e, exu_ffu_ist_e,
   ifu_tlu_flsh_inst_e, ifu_lsu_ld_inst_e, lsu_ffu_stb_full0,
   lsu_ffu_stb_full1, lsu_ffu_stb_full2, lsu_ffu_stb_full3,
//sotheas,8/17/04: fixed eco 6529
   lsu_ffu_st_dtlb_perr_g
//////////////////////////////
   ) ;
   /*AUTOINPUT*/
   // Beginning of automatic inputs (from unused autoinst inputs)
   input [31:0]         dp_ctl_gsr_mask_e;      // To visctl of sparc_ffu_ctl_visctl.v
   input [4:0]          dp_ctl_gsr_scale_e;     // To visctl of sparc_ffu_ctl_visctl.v
   input [2:0]          exu_ffu_gsr_align_m;    // To visctl of sparc_ffu_ctl_visctl.v
   input [31:0]         exu_ffu_gsr_mask_m;     // To visctl of sparc_ffu_ctl_visctl.v
   input [2:0]          exu_ffu_gsr_rnd_m;      // To visctl of sparc_ffu_ctl_visctl.v
   input [4:0]          exu_ffu_gsr_scale_m;    // To visctl of sparc_ffu_ctl_visctl.v
   input                exu_ffu_wsr_inst_e;     // To visctl of sparc_ffu_ctl_visctl.v
   input [6:0]          ifu_tlu_sraddr_d;       // To visctl of sparc_ffu_ctl_visctl.v
   // End of automatics
   input rclk;
   input si;
   input se;
   input grst_l;
   input arst_l;
   input rst_tri_en;
   input [1:0] dp_ctl_rs2_sign;
 
   input          cpx_vld;
   input          cpx_fcmp;
   input [3:0]    cpx_req;
   input [1:0]    cpx_fccval;
   input [4:0]    cpx_fpexc;
   input [7:0] dp_ctl_fsr_fcc;
   input [1:0] dp_ctl_fsr_rnd;
   input [4:0] dp_ctl_fsr_tem;
         input [4:0] dp_ctl_fsr_aexc;
         input [4:0] dp_ctl_fsr_cexc;
 
   input [6:0] dp_ctl_synd_out_low;   // signals for ecc errors
   input [6:0] dp_ctl_synd_out_high;
 
   input       ifu_ffu_fpop1_d;
   input       ifu_ffu_fpop2_d;
   input       ifu_ffu_visop_d;
   input [8:0] ifu_ffu_fpopcode_d;
   input [4:0] ifu_ffu_frs1_d;
   input [4:0] ifu_ffu_frs2_d;
   input [4:0] ifu_ffu_frd_d;
   input       ifu_ffu_fld_d;
   input       ifu_ffu_fst_d;
   input       ifu_ffu_ldst_single_d;
   input [1:0] ifu_ffu_tid_d;
   input [1:0] ifu_ffu_fcc_num_d;
   input       ifu_ffu_mvcnd_m;
 
   input       ifu_ffu_inj_frferr;
   input [6:0] ifu_exu_ecc_mask;
 
   input       ifu_ffu_ldfsr_d,
               ifu_ffu_ldxfsr_d,
               ifu_ffu_stfsr_d;
   input       ifu_ffu_quad_op_e;
 
   input       ifu_tlu_inst_vld_w;
   input       lsu_ffu_flush_pipe_w;
   input       ifu_tlu_flush_w;
 
   input        lsu_ffu_ack;
   input        lsu_ffu_ld_vld;
   input [2:0]  lsu_ffu_bld_cnt_w;
   input [7:0]  dp_ctl_ld_fcc;
 
   input        ifu_exu_nceen_e;// enable ecc traps
   input        ifu_exu_disable_ce_e; // all ce are treated as ue
   input        lsu_ffu_blk_asi_e;
   input        exu_ffu_ist_e;
   input        ifu_tlu_flsh_inst_e;
   input        ifu_lsu_ld_inst_e;
   input        lsu_ffu_stb_full0;
   input        lsu_ffu_stb_full1;
   input        lsu_ffu_stb_full2;
   input        lsu_ffu_stb_full3;
 
   input        lsu_ffu_st_dtlb_perr_g; //sotheas,8/17/04: fixed eco 6529, when asserted terminated
                                        //                 block store
 
   /*AUTOOUTPUT*/
   // Beginning of automatic outputs (from unused autoinst outputs)
   output [3:0]         ctl_dp_gsr_wsr_w2;      // From visctl of sparc_ffu_ctl_visctl.v
   output [3:0]         ctl_dp_thr_e;           // From visctl of sparc_ffu_ctl_visctl.v
   output [36:0]        ctl_dp_wsr_data_w2;     // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_add32;          // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_align0;         // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_align2;         // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_align4;         // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_align6;         // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_align_odd;      // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_cin;            // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_log_constant;   // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_log_invert_rs1; // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_log_invert_rs2; // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_log_pass_const; // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_log_pass_rs1;   // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_log_pass_rs2;   // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_log_sel_nand;   // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_log_sel_nor;    // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_log_sel_pass;   // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_log_sel_xor;    // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_sel_add;        // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_sel_align;      // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_sel_log;        // From visctl of sparc_ffu_ctl_visctl.v
   output               ctl_vis_subtract;       // From visctl of sparc_ffu_ctl_visctl.v
   output [31:0]        ffu_exu_rsr_data_hi_m;  // From visctl of sparc_ffu_ctl_visctl.v
   output [7:0]         ffu_exu_rsr_data_lo_m;  // From visctl of sparc_ffu_ctl_visctl.v
   output [2:0]         ffu_exu_rsr_data_mid_m; // From visctl of sparc_ffu_ctl_visctl.v
   // End of automatics
   output               so;
   output               ctl_dp_rst_l;
   output       ffu_ifu_fpop_done_w2;
   output [3:0] ffu_ifu_cc_vld_w2;// one hot valid for each set of fcc
   output [7:0] ffu_ifu_cc_w2;// all 4 sets of fcc
   output [1:0] ffu_ifu_tid_w2;
   output       ffu_ifu_stallreq; // stall pipe so blk st can issue
 
   output       ffu_ifu_ecc_ce_w2;  // correctable ecc error
   output       ffu_ifu_ecc_ue_w2;  // uncorrectable ecc error
   output [5:0] ffu_ifu_err_reg_w2;
   output [13:0] ffu_ifu_err_synd_w2;
   output       ffu_ifu_fst_ce_w;
   output       ffu_lsu_kill_fst_w;
   output       ffu_ifu_inj_ack;
 
   output [80:64] ffu_lsu_data;
   output         ffu_lsu_fpop_rq_vld ;   // ffu dispatches fpop issue request.
   output [5:3]  ffu_lsu_blk_st_va_e;
   output        ffu_lsu_blk_st_e;
 
   output         ffu_tlu_trap_ieee754;
   output         ffu_tlu_trap_other;
   output     ffu_tlu_trap_ue;
   output     ffu_tlu_ill_inst_m;
 
   output [1:0] ffu_tlu_fpu_tid;
   output       ffu_tlu_fpu_cmplt;
 
   output       ctl_frf_ren;
   output [1:0] ctl_frf_wen;
   output [6:0] ctl_frf_addr;
 
   output [3:0] ctl_dp_fp_thr;
 
   output [7:0] ctl_dp_fcc_w2;
   output [2:0] ctl_dp_ftt_w2;
   output [9:0] ctl_dp_exc_w2;
 
   output ctl_dp_ecc_sel_frf;
 
 
   // mux selects
   output       ctl_dp_output_sel_rs1;
   output       ctl_dp_output_sel_rs2;
   output       ctl_dp_output_sel_frf;
   output       ctl_dp_output_sel_fsr;
 
   output       ctl_dp_rs2_frf_read;
   output       ctl_dp_rs2_sel_vis;
   output       ctl_dp_rs2_sel_fpu_lsu;
   output       ctl_dp_rs2_keep_data;
   output   ctl_dp_rd_ecc;
 
   output [3:0] ctl_dp_fsr_sel_ld,
                ctl_dp_fsr_sel_fpu,
                ctl_dp_fsr_sel_old;
 
   output       ctl_dp_noshift64_frf;
   output       ctl_dp_shift_frf_right;
   output       ctl_dp_shift_frf_left;
   output       ctl_dp_zero_low32_frf;
 
   output ctl_dp_new_rs1;
 
   output [1:0] ctl_dp_sign;
 
   output       ctl_dp_flip_fpu;
   output       ctl_dp_flip_lsu;
   output       ctl_dp_noflip_fpu;
   output       ctl_dp_noflip_lsu;
 
 
   wire     clk;
   wire     reset;
   wire     ffu_reset_l;
   // FPOP is broken into parts:
   // [8:4] fpop_high
   // [3:2] fpop_mid
   // [1:0] fpop_size
   wire         fpop_size_0;    // 2 lsbs of fpop
   wire         fpop_size_1;
 
   wire         fpop_high_0;    // 4 msbs of fpop
   wire         fpop_high_2;
   wire         fpop_high_4;
   wire         fpop_high_5;
   wire         fpop_high_6;
   wire         fpop_high_8;
   wire         fpop_high_a;
   wire         fpop_high_c;
   wire         fpop_high_d;
   wire         fpop_high_e;
   wire         fpop_high_10;
   wire         fpop_high_18;
   wire    fpop_low_1;
   wire    fpop_low_2;
   wire    fpop_low_4;
   wire    fpop_low_5;
   wire    fpop_low_6;
   wire    fpop_low_8;
   wire    fpop_low_9;
   wire    fpop_low_a;
   wire    fpop_low_d;
   wire    fpop_low_e;
 
   wire         source_single_e;
   wire         source_single_next;
   wire         source_single;
 
   wire         dest_single_e;
   wire         dest_single_next;
   wire         dest_single;
 
   wire [4:0]   frs1_e;
   wire [5:0]   rs1_e;
   wire [5:0]   rs1_next;
   wire [5:0]   rs1;
   wire [4:0]   frs2_e;
   wire [5:0]   rs2_e;
   wire [4:0]   frd_e;
   wire         ldst_single_e;
   wire [5:0]   rd_e;
   wire [5:1]   st_rd_d;
   wire [5:1]   write_addr;
 
   wire [5:0]    rs2_next;
   wire [5:0]    rs2;
   wire [5:0]    rd_next;
   wire [5:0]    rd;
   wire [5:1]   blk_rd;
 
   wire         is_fpop_d;
   wire    shift_frf_rs2_m;
   wire    shift_frf_rs1_w;
   wire    shift_frf_right_next;
   wire    shift_frf_right;
   wire    shift_frf_left_next;
   wire    shift_frf_left;
   wire    noshift64_frf_next;
   wire    noshift64_frf;
 
   wire         abs_w;
   wire         neg_w;
   wire         cond_move_e;
   wire         cond_move_m;
   wire         move_e;
   wire         move_m;
   wire         move_m_valid;
   wire         move_w;
   wire   move_w_valid;
   wire   move_w2;
   wire   move_w2_vld;
   wire   move_wen_m;
   wire   move_wen_w;
   wire         move_wen_w2;
   wire         move_wen_w2_valid;
 
   wire   vis_nofrf_e;
   wire         ren_rs2_e;
   wire         ren_rs2_e_vld;
   wire         ren_rs2_m;
   wire         ren_rs2_m_vld;
   wire         ren_rs2_w;
   wire         ren_rs2_w2;
   wire         ren_rs2_w3;
   wire         ren_rs2_w4;
   wire         ren_rs1_e;
   wire         ren_rs1_m;
   wire         ren_rs1_w;
   wire         ren_rs1_w_vld;
   wire         ren_rs1_w2_vld;
   wire         ren_rs1_w2;
   wire         ren_rs1_w3;
   wire         ren_rs1_w4;
   wire         ren_rs1_w5;
   wire         read_rs1;
   wire         read_rs2;
   wire   read_rd;
   wire         read_bst;
 
   wire         fpu_op_e;
   wire         fpu_op_m;
   wire         fpu_op_w_vld;
   wire         fpu_op_w;
   wire         fpu_op_w2;
   wire         fpu_op_w2_vld;
   wire         fpu_op_w3;
   wire         fpu_op_w3_vld;
   wire         any_op_e;
   wire         any_op_m;
   wire         any_op_w;
   wire         any_op_w2;
   wire         any_op_m_valid;
   wire   visop_e;
   wire   visop_m;
   wire   visop_w_vld;
 
   wire         fld_e;
   wire         fld_m;
   wire         fst_e;
   wire         fst_m;
   wire         fst_w;
   wire         zero_lower_data_next;
 
   wire   fpop1_e;
   wire   fpop2_e;
   wire   fpop1_next;
   wire   fpop1;
   wire   fpop2_next;
   wire   fpop2;
   wire   visop_next;
   wire   visop;
   wire         kill_m;
   wire         killed_w;
   wire         kill_w;
   wire         kill_unimpl_w;
   wire         kill_fp;
   wire         kill_eccchk_w;
   wire   flush_w;
   wire   flush_w2;
 
   wire [1:0]    tid_next;
   wire [1:0]   tid;
   wire [1:0]   extra_tid;
   wire [8:0]    opf_next;
   wire [8:0]    opf;
   wire [5:1]   early_frf_rnum;
   wire [5:1]   frf_rnum;
   wire [1:0]   frf_tid;
   wire [1:0]   fpu_rnd;
 
   wire         thr_match_mw2;
   wire         thr_match_ww2;
   wire         thr_match_fpw2;
   wire [1:0]    tid_e,
                tid_m,
                tid_w,
                tid_w2;
 
   wire         fpop1_ready_w2_next;
   wire         fpop2_ready_w3_next;
   wire         fpop1_ready_w2;
   wire         fpop2_ready_w3;
   wire   issue_fpop2;
 
   wire         ldfsr,
                ldxfsr,
                stfsr_e,
                stfsr_w,
                stfsr_qual_w,
                ldfsr_vld,
                ldxfsr_vld;
   wire   stfsr_w2;
   wire   stfsr_w2_vld;
 
   wire   clear_ftt;
 
   wire [1:0]    ldfsr_next;
 
   wire         is_fpu_result;
 
   wire   output_sel_rs1_next;
   wire   output_sel_frf_next;
   wire   output_sel_fsr_next;
   wire   output_sel_rs2_next;
   wire   output_sel_rs1;
   wire   output_sel_frf;
   wire   output_sel_fsr;
   wire   output_sel_rs2;
 
   wire   ffu_op_done_next;
   wire   ffu_op_done;
   wire   ffu_op_done_vld;
   wire         external_wen_next;
   wire         lsu_pkt_vld;
   wire [1:0]    lsu_pkt_type;
   wire         store_ready;
   wire         load_pending;
   wire         load_pending_next;
   wire   blk_ld_done;
   wire   blk_ld_m;
   wire         blk_load_pending;
   wire         blk_load_pending_next;
   wire         fp_pending,
                fp_pending_next;
 
   wire [3:0]    fcc_num_dec;
   wire [1:0]    fcc_num,
                fcc_num_next;
 
   wire [7:0]    fpu_fcc;
   wire [9:0]    fp_exc_w2;
 
   wire         fcc_sel_fpu;
   wire         fcc_sel_ldx;
   wire         fcc_sel_ld;
   wire         fcc_sel_old;
   wire         cc_changed;
   wire         rf_wen;
   wire   rf_wen_next;
   wire   rf_ecc_gen_next;
   wire   rf_ecc_gen;
   wire   vis_wen_next;
   wire   vis_result;
 
   wire [4:0] fsr_tem_d1;
   wire       ieee_trap;
   wire         take_ieee_trap;
   wire         take_other_trap;
   wire [4:0]    ieee_trap_vec;
   wire         fpexc_nxc;
   wire   fpexc_ofc;
   wire   fpexc_ufc;
 
   wire [1:0] error_detected;
   wire [1:0] possible_ue;
   wire [1:0] ce;
   wire [1:0] prev_err_detected;
   wire [1:0] prev_poss_ue;
   wire       rollback_fst_m;
   wire       rollback_fst_w;
   wire       rollback_rs2_w2;
   wire       rollback_rs1_w3;
   wire       rollback_c1_next;
   wire   rollback_c1;
   wire   rollback_c1_vld;
   wire   rollback_c2;
   wire   rollback_c3;
   wire   rolled_back_next;
   wire   rolled_back;
   wire   chk_rs1_w2;
   wire         check_ecc_next;
   wire [1:0] chk_ecc_m;
   wire [1:0] chk_ecc_w;
   wire [1:0] chk_ecc_w2;
   wire [1:0] chk_ecc;
   wire [1:0] chk_ecc_prev;
   wire   disable_ce_m;
   wire   disable_ce_w;
   wire         fst_ce_w;
   wire         fst_ue_w;
   wire         fst_ce_w2;
   wire         fst_ue_w2;
   wire         rs2_ce_w2;
   wire         rs2_ue_w2;
   wire         rs2_fst_ce_w2_vld;
   wire         rs2_fst_ue_w2_vld;
   wire         rs2_fst_ce_w3;
   wire         rs2_fst_ue_w3;
   wire   rs1_ce_w3;
   wire         ce_w3;
   wire         ue_w3;
   wire   nceen;
   wire   nceen_next;
   wire   ue_trap_w3;
   wire [1:0]    previous_ce;
   wire         previous_ue;
   wire [1:0]    ecc_wen_next;
   wire [1:0]    ecc_wen_gen_next;
   wire [1:0]    ecc_wen_gen;
   wire [1:0]    ecc_wen;
   wire         inject_err_next;
   wire [6:0]    err_data;
   wire         inject_err;
   wire   wen_rs1_ecc;
   wire   wen_rs2_ecc;
   wire   ecc_kill_rs2_w2;
   wire [13:0] new_err_synd;
   wire [13:0] err_synd_d1;
   wire [13:0] err_synd_next;
   wire [5:0]  new_err_reg;
   wire [5:0]  err_reg_next;
   wire [5:0]  err_reg_d1;
   wire        log_new_err;
   wire   kill_st_ce_w;
   wire   possible_kill_st_ue_m;
   wire   possible_kill_st_ce_m;
   wire   possible_kill_st_ue_w;
   wire   possible_kill_st_ce_w;
 
   wire         unimpl_op_e,
                unimpl_op_all_e,
                unimpl_op_m,
                unimpl_op_w,
                unimpl_qual_w,
                unimpl_qual_w2,
                unimpl_op_w2;
   wire    illegal_vis_e;
   wire    illegal_vis_m;
   wire    illegal_blk_m;
   wire    illegal_rs1_e;
   wire    illegal_field_e;
   wire    convert_op_e;
 
   wire          cpx_vld_d1;
   wire          cpx_fcmp_d1;
   wire [3:0]    cpx_req_d1;
   wire [1:0]    cpx_fccval_d1;
   wire [4:0]    cpx_fpexc_d1;
 
   wire   bst_m;
   wire   bst_w;
   wire   st_dtlb_perr_w2_l;
   wire   can_issue_bst_c2;
   wire   other_mem_op_e;
   wire [5:0] bst_rs;
   wire [2:0] bst_cnt;
   wire [2:0] bst_cnt_next;
   wire       bst_read_req;
   wire       bst_issue_c1;
   wire       bst_issue_c2;
   wire       bst_issue_c3;
   wire       bst_issue_c4;
   wire       bst_issue_c5;
   wire       bst_issue_c6;
   wire       bst_issue_c1_next;
   wire       bst_issue_c2_next;
   wire       bst_issue_c3_next;
   wire       bst_issue_c4_next;
   wire       bst_issue_c5_next;
   wire       bst_issue_c6_next;
   wire       bst_done;
   wire [2:0] bld_cnt_d1;
   wire [2:0] bld_cnt_d2;
   wire [2:0] bld_cnt_d3;
   wire       stb_full0;
   wire       stb_full1;
   wire       stb_full2;
   wire       stb_full3;
   wire       stb_full_c2;
   wire [5:0] bst_stall_cnt;
   wire [5:0] bst_stall_cnt_next;
   wire       bst_stall_req;
   wire       bst_stall_req_next;
   wire       fld_done;
   wire       ld_ret;
   wire   bst_ce_c4;
   wire   bst_ue_c4;
   wire   fixed_bst_ce;
   wire   fixed_bst_ce_next;
   wire   blk_asi_m;
 
//
// Code begins here
//
   assign clk = rclk;
   // Reset flop
    dffrl_async rstff(.din (grst_l),
                        .q   (ffu_reset_l),
                        .clk (clk),
                        .rst_l (arst_l), .si(), .so(), .se(se));
   assign        ctl_dp_rst_l = ffu_reset_l;
   assign        reset = ~ffu_reset_l;
   // Stage cpx data by one cycle
   dff #(13) cpx_dff(.din({cpx_vld, cpx_fcmp, cpx_req[3:0], cpx_fccval[1:0], cpx_fpexc[4:0]}),
                     .q({cpx_vld_d1, cpx_fcmp_d1, cpx_req_d1[3:0], cpx_fccval_d1[1:0], cpx_fpexc_d1[4:0]}),
                     .clk(clk), .se(se), .si(), .so());
   dff #(3) lsu_bld_cnt1_dff(.din({lsu_ffu_bld_cnt_w[2:0]}), .clk(clk),
                         .q({bld_cnt_d1[2:0]}), .se(se), .si(), .so());
   dff #(3) lsu_bld_cnt2_dff(.din({bld_cnt_d1[2:0]}), .clk(clk),
                         .q({bld_cnt_d2[2:0]}), .se(se), .si(), .so());
   dff #(3) lsu_bld_cnt3_dff(.din({bld_cnt_d2[2:0]}), .clk(clk),
                         .q({bld_cnt_d3[2:0]}), .se(se), .si(), .so());
 
//----------------------------------------
// Decode Instruction From IFU
//----------------------------------------
   dff #(3) fpop_d2e(.din({ifu_ffu_fpop1_d, ifu_ffu_fpop2_d, ifu_ffu_visop_d}), .clk(clk),
                     .q({fpop1_e, fpop2_e, visop_e}), .se(se), .si(), .so());
   assign        fpop1_next = (any_op_e | reset)? fpop1_e: fpop1;
   assign        fpop2_next = (any_op_e | reset)? fpop2_e: fpop2;
   assign        visop_next = (any_op_e | reset)? visop_e: visop;
   dff #(3) fpop_dff(.din({fpop1_next,fpop2_next,visop_next}),
                     .q({fpop1,fpop2,visop}),
                     .clk(clk), .se(se), .si(), .so());
 
   assign  fpop_size_0 = ~opf[1] & ~opf[0];
   assign  fpop_size_1 = ~opf[1] & opf[0];
 
   assign  fpop_low_1 = ~opf[3] & ~opf[2] & ~opf[1] & opf[0];
   assign  fpop_low_2 = ~opf[3] & ~opf[2] & opf[1] & ~opf[0];
   assign  fpop_low_4 = ~opf[3] & opf[2] & ~opf[1] & ~opf[0];
   assign  fpop_low_5 = ~opf[3] & opf[2] & ~opf[1] & opf[0];
   assign  fpop_low_6 = ~opf[3] & opf[2] & opf[1] & ~opf[0];
   assign  fpop_low_8 = opf[3] & ~opf[2] & ~opf[1] & ~opf[0];
   assign  fpop_low_9 = opf[3] & ~opf[2] & ~opf[1] & opf[0];
   assign  fpop_low_a = opf[3] & ~opf[2] & opf[1] & ~opf[0];
   assign  fpop_low_d = opf[3] & opf[2] & ~opf[1] & opf[0];
   assign  fpop_low_e = opf[3] & opf[2] & opf[1] & ~opf[0];
 
   assign  fpop_high_0 = ~opf[8] & ~opf[7] & ~opf[6] & ~opf[5] & ~opf[4];
   assign  fpop_high_2 = ~opf[8] & ~opf[7] & ~opf[6] & opf[5] & ~opf[4];
   assign  fpop_high_4 = ~opf[8] & ~opf[7] & opf[6] & ~opf[5] & ~opf[4];
   assign  fpop_high_5 = ~opf[8] & ~opf[7] & opf[6] & ~opf[5] & opf[4];
   assign  fpop_high_6 = ~opf[8] & ~opf[7] & opf[6] & opf[5] & ~opf[4];
   assign  fpop_high_a = ~opf[8] & opf[7] & ~opf[6] & opf[5] & ~opf[4];
   assign  fpop_high_8 = ~opf[8] & opf[7] & ~opf[6] & ~opf[5] & ~opf[4];
   assign  fpop_high_c = ~opf[8] & opf[7] & opf[6] & ~opf[5] & ~opf[4];
   assign  fpop_high_d = ~opf[8] & opf[7] & opf[6] & ~opf[5] & opf[4];
   assign  fpop_high_e = ~opf[8] & opf[7] & opf[6] & opf[5] & ~opf[4];
   assign  fpop_high_10 = opf[8] & ~opf[7] & ~opf[6] & ~opf[5] & ~opf[4];
   assign  fpop_high_18 = opf[8] & opf[7] & ~opf[6] & ~opf[5] & ~opf[4];
 
   assign  unimpl_op_e = ~((fpop_low_1 | fpop_low_2) & (fpop_high_0 | fpop_high_4 | fpop_high_8 |
                                                        fpop1_e & fpop_high_d |
                                                        fpop2_e & (fpop_high_5 | fpop_high_c |
                                                                           fpop_high_10 | fpop_high_18)) |
                           (fpop_low_4 | fpop_low_8) & fpop1_e & (fpop_high_8 | fpop_high_c) |
                           (fpop_low_5 | fpop_low_6) & (fpop_high_4 |
                                                        fpop1_e & fpop_high_0 |
                                                        fpop2_e & (fpop_high_2 | fpop_high_5 |
                                                                           fpop_high_6 | fpop_high_a |
                                                                           fpop_high_c | fpop_high_e)) |
                           fpop_low_6 & fpop1_e & fpop_high_c |
                           fpop_low_9 & fpop1_e & (fpop_high_0 | fpop_high_4 | fpop_high_6 |
                                                           fpop_high_c) |
                           fpop_low_a & fpop1_e & (fpop_high_0 | fpop_high_4) |
                           (fpop_low_d | fpop_low_e) & fpop1_e & fpop_high_4) & (fpop1_e | fpop2_e);
   assign illegal_field_e = fpop2_e & (fpop_high_5 & |rd_e[4:2] |// bits 29:27 must be zero on fcmp
                                       ~opf[4] & ~opf[2] & rs1_e[4]);// bit 18 must be zero on fmovcc
 
 
   assign  convert_op_e = fpop1_e & opf[7];
   assign  illegal_rs1_e = (frs1_e[4:0] != 5'b00000) & (move_e & ~rollback_c3 | convert_op_e);
 
//
// Decode size of source and destination. don't care for unimplemented ops
//
   assign source_single_e = (fpop_high_c & fpop_size_0) | //32b int
                                 (opf[0]);// single (also quad but those are illegal
 
/* -----\/----- EXCLUDED -----\/-----
   assign  convert_op = (ifu_ffu_fpopcode_d[7] |fpop_high_6_d) & ifu_ffu_fpop1_d;
   assign dest_single_d = (is_fpop_d)? (fpop_size_1_d & ~convert_op) | // sgl and not conv
                                         (ifu_ffu_fpop1_d & ifu_ffu_fpopcode_d[7] & ~ifu_ffu_fpopcode_d[3] &
                                          (~fpop_high_8_d | ifu_ffu_fpopcode_d[2])) |// int to s or float to short int
                                           (ifu_ffu_visop_d & ifu_ffu_fpopcode_d[0]) :// vis single
                                        ifu_ffu_ldst_single_d;
 -----/\----- EXCLUDED -----/\----- */
   assign dest_single_e = (fpop1_e & (~opf[1] & opf[0] & ~(opf[7] |fpop_high_6) | // sgl and not conv
                                              opf[7] & ~opf[3] &
                                              (~fpop_high_8 | opf[2])) |// int to s or float to short int
                           fpop2_e & fpop_size_1 |
                           visop_e & opf[0] | // vis single
                           (fst_e | fld_e) & ldst_single_e);
 
   assign unimpl_op_all_e = (unimpl_op_e | ifu_ffu_quad_op_e |
                             illegal_rs1_e | illegal_field_e);
 
   dff #1 qopm_ff(.din (unimpl_op_all_e),
                  .q   (unimpl_op_m),
                  .clk (clk), .se(se), .si(), .so());
 
   dff #1 qopw_ff(.din (unimpl_op_m),
                  .q   (unimpl_op_w),
                  .clk (clk), .se(se), .si(), .so());
   assign unimpl_qual_w = unimpl_op_w & ~kill_unimpl_w;
   assign unimpl_qual_w2 = unimpl_op_w2 & ~flush_w2;
 
   dff #1 qopw2_ff(.din (unimpl_qual_w),
                   .q   (unimpl_op_w2),
                   .clk (clk), .se(se), .si(), .so());
 
 
   // Decode register encoding (bit[5] wrapped to bit[0] for non singles)
   // Also the storage is flopped around so odd regs are at even addresses 
   // in the regfile for singles.  this helps because everything external 
   // expects data to be [63:0] not [31:0, 63:32] on doubles.
 
   assign rs1_e[5] = frs1_e[0] & ~source_single_e;// zero for singles
   assign rs1_e[4:2] = frs1_e[4:2];
   assign rs1_e[1] = frs1_e[1];
   assign rs1_e[0] = frs1_e[0] & source_single_e;// only nonzro for sgl
 
   assign rs2_e[5] = frs2_e[0] & ~source_single_e;// zero for singles
   assign rs2_e[4:2] = frs2_e[4:2];
   assign rs2_e[1] = frs2_e[1];
   assign rs2_e[0] = frs2_e[0] & source_single_e;// only nonzro for sgl
 
   assign rd_e[5] = frd_e[0] & ~dest_single_e;// zero for singles
   assign rd_e[4:2] = frd_e[4:2];
   assign rd_e[1] = frd_e[1];
   assign rd_e[0] = frd_e[0] & dest_single_e;// only nonzro for sgl
 
 
   // Decode general type of operation
   assign is_fpop_d = ifu_ffu_fpop1_d | ifu_ffu_fpop2_d | ifu_ffu_visop_d;
 
   // Do locally
   assign move_e = fpop_high_0 & (fpop1_e | (fpop1 & rollback_c3)) |
                                                (rollback_c3 & fpop2 & ~opf[4]);// rollback cond_move
   // cond moves don't get rollback because they either don't happen or become unconditional
   assign cond_move_e = fpop2_e & ~opf[4];
 
   assign abs_w = move_w & fpop_high_0 & opf[3];
   assign neg_w = move_w & fpop_high_0 & opf[2];
 
   // Send to FPU
   assign fpu_op_e = ((~fpop_high_0 & fpop1_next) | (fpop_high_5 & fpop2_next)) & (any_op_e | rollback_c3);
 
   // FRF read indication
   assign ren_rs2_e = (fpop1_e | fpop2_e | visop_e) | rollback_c3;
   assign ren_rs2_e_vld = ren_rs2_e & ~vis_nofrf_e;
   assign ren_rs2_m_vld = ren_rs2_m & (cond_move_m & ifu_ffu_mvcnd_m | ~cond_move_m);
   assign ren_rs1_e = ((~vis_nofrf_e & visop_e) | // all vis except siam read rs1
                       (rollback_c3 & visop) |
                       ((fpop2_next & opf[4]) | //FCMP
                        (fpop1_next & ~opf[7] & opf[6])) &      // add,sub,mul,div
                       (any_op_e | rollback_c3 & ~reset));
   assign ren_rs1_w_vld = ren_rs1_w & ~kill_eccchk_w;
   assign ren_rs1_w2_vld = ren_rs1_w2 & ~flush_w2;
 
   //------------------------------------
   // Store and wait for FPop to complete
   //------------------------------------
   // Storage of control signals
 
   // >>>>> added ~kill_fp
   // set these in e so that kill_fp doesn't kill spuriously
   assign load_pending_next = fld_e |          // set
                (load_pending & ~lsu_ffu_ld_vld & ~kill_fp & ~blk_ld_m);
   assign fld_done = lsu_ffu_ld_vld & ~kill_fp & load_pending;
   dffr ldpend_dff(.din (load_pending_next),
                               .q   (load_pending),
                               .clk (clk),
                               .rst (reset),
                               .se(se), .si(), .so());
 
   assign blk_ld_m = fld_m & blk_asi_m;
   assign blk_ld_done = lsu_ffu_ld_vld & ~kill_fp & (bld_cnt_d1[2:0] == 3'b111) & blk_load_pending;
   assign blk_load_pending_next = (blk_ld_m & ~kill_m)  | // set
          (blk_load_pending & ~kill_fp & ~ffu_ifu_fpop_done_w2);
   dffr blk_ldpend_dff(.din(blk_load_pending_next),
                       .q(blk_load_pending),
                       .clk(clk),
                       .rst(reset),
                       .se(se), .si(), .so());
 
   assign fp_pending_next = fpu_op_e |   // set
                            (fp_pending & ~is_fpu_result & ~kill_fp);
   dffr fppend_dff(.din(fp_pending_next),
                               .q(fp_pending),
                               .clk(clk),
                               .rst (reset),
                               .se(se), .si(), .so());
 
   // rs1
   dff #(5) rs1_d2e(.din(ifu_ffu_frs1_d[4:0]), .clk(clk), .q(frs1_e[4:0]), .se(se), .si(), .so());
   mux2ds #(6) rs1_mux(.dout (rs1_next[5:0]),
                          .in0  (rs1[5:0]),
                          .in1  (rs1_e[5:0]),
                          .sel0  (~any_op_e),
                          .sel1  (any_op_e));
   dff #(6) rs1_dff(.din(rs1_next[5:0]),
                                .clk(clk),
                                .q(rs1[5:0]),
                    .se(se), .si(), .so());
   // rs2
   dff #(5) rs2_d2e(.din(ifu_ffu_frs2_d[4:0]), .clk(clk), .q(frs2_e[4:0]), .se(se), .si(), .so());
   mux2ds #(6) rs2_mux(.dout(rs2_next[5:0]),
                       .in0 (rs2[5:0]),
                       .in1 (rs2_e[5:0]),
                       .sel0(~any_op_e),
                       .sel1 (any_op_e));
   dff #(6) rs2_dff(.din (rs2_next[5:0]),
                                .clk (clk),
                                .q   (rs2[5:0]),
                    .se(se), .si(), .so());
   // rd
   dff #(6) rd_d2e(.din({ifu_ffu_ldst_single_d,ifu_ffu_frd_d[4:0]}), .clk(clk),
                   .q({ldst_single_e,frd_e[4:0]}),
                   .se(se), .si(), .so());
   mux2ds #(6) rd_mux(.dout (rd_next[5:0]),
                      .in0  (rd[5:0]),
                      .in1  (rd_e[5:0]),
                      .sel0 (~any_op_e),
                      .sel1  (any_op_e));
   dff #(6) rd_dff(.din (rd_next[5:0]),
                               .clk (clk),
                               .q    (rd[5:0]),
                   .se  (se), .si(), .so());
   // rs size
   mux2ds source_single_mux(.dout (source_single_next),
                            .in0  (source_single),
                            .in1  (source_single_e),
                            .sel0(~any_op_e),
                            .sel1 (any_op_e));
   dff source_single_dff(.din(source_single_next),
                                           .clk(clk),
                                           .q(source_single),
                         .se(se), .si(), .so());
   // rd size
   assign dest_single_next = (any_op_e)? dest_single_e: dest_single;
   dff dest_single_dff(.din (dest_single_next),
                                            .clk (clk),
                                            .q   (dest_single),
                          .se  (se), .si(), .so());
   // thread
   mux2ds #(2) tid_mux(.dout (tid_next[1:0]),
                       .in0  (tid[1:0]),
                       .in1  (tid_e[1:0]),
                       .sel0 (~any_op_e),
                       .sel1  (any_op_e));
   dff #(2) tid_dff(.din(tid_next[1:0]),
                                .clk(clk),
                                .q(tid[1:0]),
                    .se(se), .si(), .so());
   // extra tid to help fanout for critical signals
   dff #(2) extra_tid_dff(.din(tid_next[1:0]),
                          .clk(clk), .q(extra_tid[1:0]), .se(se), .si(), .so());
   // fcc num
   mux2ds #(2) fcc_mux(.dout (fcc_num_next[1:0]),
                       .in0   (fcc_num[1:0]),
                       .in1   (ifu_ffu_fcc_num_d[1:0]),
                       .sel0 (~is_fpop_d),
                       .sel1   (is_fpop_d));
   dff #(2) fcc_dff(.din (fcc_num_next[1:0]),
                                .clk (clk),
                                .q   (fcc_num[1:0]),
                    .se  (se), .si(), .so());
 
   // ldfsr
   mux2ds #(2) ldfsr_mux(.dout (ldfsr_next[1:0]),
                         .in0  ({ldfsr, ldxfsr}),
                         .in1  ({ifu_ffu_ldfsr_d, ifu_ffu_ldxfsr_d}),
                         .sel0  (~ifu_ffu_fld_d),
                         .sel1  (ifu_ffu_fld_d));
   dff #(2) ldfsr_dff(.din (ldfsr_next[1:0]),
                                  .clk (clk),
                                  .q   ({ldfsr, ldxfsr}),
                      .se  (se), .si(), .so());
 
   // op code
   mux2ds #(9) opf_mux(.dout (opf_next[8:0]),
                       .in0  (opf[8:0]),
                       .in1  (ifu_ffu_fpopcode_d[8:0]),
                       .sel0  (~is_fpop_d),
                       .sel1  (is_fpop_d));
   dff #(9) opf_dff(.din(opf_next[8:0]),
                                .clk(clk),
                                .q(opf[8:0]),
                   .se(se), .si(), .so());
   //----------
   // FP Pipe
   //----------
   dff fop_e2m(.din(any_op_e), .clk(clk),
                     .q(any_op_m),
                     .se(se), .si(), .so());
 
   dff fop_m2w(.din(any_op_m_valid), .clk(clk),
                     .q(any_op_w),
                     .se(se), .si(), .so());
   dff fop_w2w2(.din(any_op_w), .clk(clk),
                     .q(any_op_w2),
                     .se(se), .si(), .so());
 
   dff fst_d2e(.din(ifu_ffu_fst_d),  .clk(clk),
                     .q  (fst_e),
                     .se(se), .si(), .so());
   dff fst_e2m(.din(fst_e), .clk(clk),
                     .q  (fst_m),
                     .se(se), .si(), .so());
   dff fst_m2w(.din(fst_m), .clk(clk),
                     .q  (fst_w),
                     .se(se), .si(), .so());
   dff fld_d2e(.din(ifu_ffu_fld_d),  .clk(clk),
                     .q  (fld_e),
                     .se(se), .si(), .so());
   dff fld_e2m(.din(fld_e),  .clk(clk),
                     .q  (fld_m),
                     .se(se), .si(), .so());
 
   dff ren_rs2_e2m(.din(ren_rs2_e_vld), .clk(clk),
                               .q(ren_rs2_m),
                               .se(se), .si(), .so());
   dff ren_rs2_m2w(.din(ren_rs2_m_vld), .clk(clk),
                               .q(ren_rs2_w),
                               .se(se), .si(), .so());
   dff ren_rs2_w2w2(.din(ren_rs2_w), .clk(clk),
                                .q(ren_rs2_w2),
                                .se(se), .si(), .so());
   dff ren_rs2_w22w3(.din(ren_rs2_w2), .clk(clk),
                                .q(ren_rs2_w3),
                                .se(se), .si(), .so());
   dff ren_rs2_w32w4(.din(ren_rs2_w3), .clk(clk),
                                .q(ren_rs2_w4),
                                .se(se), .si(), .so());
 
   dff ren_rs1_e2m(.din(ren_rs1_e), .clk(clk),
                               .q(ren_rs1_m),
                               .se(se), .si(), .so());
   dff ren_rs1_m2w(.din(ren_rs1_m), .clk(clk),
                               .q(ren_rs1_w),
                               .se(se), .si(), .so());
   dff ren_rs1_w2w2(.din(ren_rs1_w_vld), .clk(clk),
                               .q(ren_rs1_w2),
                               .se(se), .si(), .so());
   dff ren_rs1_w22w3(.din(ren_rs1_w2_vld), .clk(clk),
                               .q(ren_rs1_w3),
                               .se(se), .si(), .so());
   dff ren_rs1_w32w4(.din(ren_rs1_w3), .clk(clk),
                               .q(ren_rs1_w4),
                               .se(se), .si(), .so());
   dff ren_rs1_w42w5(.din(ren_rs1_w4), .clk(clk),
                               .q(ren_rs1_w5),
                               .se(se), .si(), .so());
 
   dff cond_move_e2m(.din(cond_move_e), .clk(clk),
                                 .q(cond_move_m),
                                 .se(se), .si(), .so());
 
   dff move_e2m(.din(move_e), .clk(clk),
                            .q(move_m),
                            .se(se), .si(), .so());
   dff move_m2w(.din(move_m_valid), .clk(clk),
                            .q(move_w),
                            .se(se), .si(), .so());
   dff move_wen_m2w(.din(move_wen_m), .clk(clk), .q(move_wen_w),
                    .se(se), .si(), .so());
   dff move_wen_w2w2(.din(move_wen_w), .clk(clk), .q(move_wen_w2),
                    .se(se), .si(), .so());
   dff move_wdff(.din(move_w_valid), .clk(clk), .q(move_w2), .se(se), .si(), .so());
 
   dff stfsr_d2e(.din(ifu_ffu_stfsr_d),
                             .q(stfsr_e),
                             .clk(clk),
                             .se(se), .si(), .so());
 
   dff fpu_op_e2m(.din(fpu_op_e), .clk(clk),
                              .q(fpu_op_m),
                              .se(se), .si(), .so());
   dff fpu_op_m2w(.din(fpu_op_m), .clk(clk),
                              .q(fpu_op_w),
                              .se(se), .si(), .so());
   dff fpu_op_w2w2(.din(fpu_op_w_vld), .clk(clk),
                              .q(fpu_op_w2),
                              .se(se), .si(), .so());
   dff fpu_op_w22w3(.din(fpu_op_w2_vld), .clk(clk),
                              .q(fpu_op_w3),
                              .se(se), .si(), .so());
 
   dff #(2) tid_d2e(.din(ifu_ffu_tid_d[1:0]),
                                .clk(clk),
                                .q(tid_e[1:0]),
                                .se(se), .si(), .so());
 
   dff #(2) tid_e2m(.din(tid_e[1:0]),
                                .clk(clk),
                                .q(tid_m[1:0]),
                                .se(se), .si(), .so());
 
   dff #(2) tid_m2w(.din(tid_m[1:0]),
                                .clk(clk),
                                .q(tid_w[1:0]),
                                .se(se), .si(), .so());
 
   dff #(2) tid_w2w2(.din(tid_w[1:0]),
                                 .clk(clk),
                                 .q(tid_w2[1:0]),
                                 .se(se), .si(), .so());
 
   dff dff_killed_w(.din(kill_m),
                                .clk(clk),
                                .q(killed_w),
                                .se(se), .si(), .so());
 
   dff dff_flush_w2(.din(flush_w), .clk(clk), .q(flush_w2), .se(se), .si(), .so());
 
   assign  thr_match_mw2 = ~((tid_m[1] ^ tid_w2[1]) |
                           (tid_m[0] ^ tid_w2[0]));
   assign  thr_match_ww2 = ~((tid_w[1] ^ tid_w2[1]) |
                           (tid_w[0] ^ tid_w2[0]));
 
   assign thr_match_fpw2 = ~((tid[1] ^ tid_w2[1]) |
                           (tid[0] ^ tid_w2[0]));
 
   // new fpops squash previous ones (only possible in m or w, but w will also have ifu_tlu_flush_w)
   // all kill_w signals do not include lsu_ffu_flush_pipe_w.  This must be included at the final destination
   assign flush_w = (lsu_ffu_flush_pipe_w | ifu_tlu_flush_w) & ~rolled_back;
   assign any_op_e = fpop1_e | fpop2_e | fst_e | fld_e | visop_e;
   assign any_op_m_valid = any_op_m & ~any_op_e;
   assign  kill_m = (thr_match_mw2 & flush_w2) | any_op_e;
   assign  kill_eccchk_w = (~ifu_tlu_inst_vld_w | killed_w | unimpl_op_w | any_op_e |
                            (thr_match_ww2 & flush_w2)) & ~rolled_back;
   // unimplemented ops don't check rolled_back because they trap before rollback happens
   assign  kill_unimpl_w = (~ifu_tlu_inst_vld_w | killed_w | any_op_e
                          | (thr_match_ww2 & flush_w2));
   assign  kill_w = (~ifu_tlu_inst_vld_w | killed_w | any_op_e |
                          unimpl_op_w | ffu_lsu_kill_fst_w | (thr_match_ww2 & flush_w2)) & ~rolled_back;
   // this kills the "pending" signals that are set in the E stage.
   // Since they are set in E all the kills can be delayed by one cycle without
   // squashing a new, valid op
   assign  kill_fp = (thr_match_fpw2 & flush_w2 | any_op_e |
                                  any_op_w & (~ifu_tlu_inst_vld_w | unimpl_op_w)) & ~rolled_back;
 
 
//----------------------------
// Control for muxes that manipulate data to/from FRF
//----------------------------
   // implement fmov/fmovcc
   assign  move_wen_m = move_m | (cond_move_m & ifu_ffu_mvcnd_m);
   assign  move_wen_w2_valid = move_wen_w2 & move_w2_vld;
   assign  move_m_valid = (move_m | cond_move_m);
   // used for updating fsr
   assign  move_w_valid = move_w & ~kill_w;
   assign  move_w2_vld = move_w2 & ~flush_w2 & ~rollback_rs2_w2 & ~(rs2_ue_w2 & nceen);
 
   // negation or absolute value happen to rs2 in the m_stage if needed
   assign  ctl_dp_sign[1] = (dp_ctl_rs2_sign[1] ^ neg_w) & ~abs_w;
   assign  ctl_dp_sign[0] = (source_single) ?
                             (dp_ctl_rs2_sign[0] ^ neg_w) & ~abs_w :
                              dp_ctl_rs2_sign[0];
 
   //
   // Shifts to align sgl precision 32b data
   //
   // mux for moving around single data from frf
 
   // shift on moves or stores
   assign shift_frf_rs2_m = (rs2[0] ^ rd[0]) & (move_m | cond_move_m | visop_m) & ~fst_e;
   assign shift_frf_rs1_w = (rs1[0] ^ rd[0]) & visop_w_vld; //check for squash
 
   assign  shift_frf_right_next = (source_single & shift_frf_rs2_m & ~rs2[0]) |
                                      (source_single & shift_frf_rs1_w & ~rs1[0]) |
                                      (dest_single_e & fst_e & ~rd_e[0]);
 
   assign  shift_frf_left_next = ((source_single & rs2[0] & (shift_frf_rs2_m | fpu_op_m & ~fst_e) |
                                   source_single & rs1[0] & (shift_frf_rs1_w | fpu_op_w_vld))
                                  & ~shift_frf_right_next);
 
   assign  noshift64_frf_next = ~(shift_frf_right_next | shift_frf_left_next);
 
   assign  ctl_dp_shift_frf_right = shift_frf_right & ~rst_tri_en;
   assign  ctl_dp_shift_frf_left = shift_frf_left & ~rst_tri_en;
   assign  ctl_dp_noshift64_frf = noshift64_frf | rst_tri_en;
 
   // fpu expects lower 32 bits to be zero on single operands
   assign  zero_lower_data_next = ((source_single & ~rs1[0] & fpu_op_w_vld) |
                                   (source_single & ~rs2[0] & fpu_op_m));
 
   dff shift_frf_right_dff(.din(shift_frf_right_next), .clk(clk), .q(shift_frf_right),
                           .se(se), .si(), .so());
   dff shift_frf_left_dff(.din(shift_frf_left_next), .clk(clk), .q(shift_frf_left),
                           .se(se), .si(), .so());
   dff noshift64_dff(.din(noshift64_frf_next), .clk(clk), .q(noshift64_frf),
                     .se(se), .si(), .so());
   dff noshift32_dff(.din(zero_lower_data_next), .clk(clk), .q(ctl_dp_zero_low32_frf),
                     .se(se), .si(), .so());
 
   wire    flip_fpu;
   wire    flip_lsu;
   // mux for rearranging data from fpu
   // data comes in with msb always at b63.  This means that singles with an odd
   // rd must be flipped so that the data ends up in the correct
   //  registers.
   assign  flip_fpu = (dest_single & rd[0]);// single with odd rd
 
   // mux for rearranging data from lsu
   // data comes in [63:0].  This means that singles with an even
   // rd must be flipped so that the data ends up in the correct
   //  registers.
   assign  flip_lsu = (dest_single & ~rd[0]);// single with even rd
 
   assign  ctl_dp_noflip_lsu = ld_ret & ~flip_lsu;
   assign  ctl_dp_flip_lsu = ld_ret & flip_lsu;
   assign  ctl_dp_noflip_fpu = ~ld_ret & ~flip_fpu & is_fpu_result & ~cpx_fcmp_d1;
   assign  ctl_dp_flip_fpu = ~ld_ret & ~ctl_dp_noflip_fpu;
 
 
//---------------------------------
// LSU Interface
//---------------------------------
 
   // Note that stores fit into the standard pipeline so they are automatically 
   // accepted and do not require an ACK.  The lsu will check for kills in m and w.
 
   assign  store_ready = fst_m | bst_issue_c3;
   assign  fpu_op_w_vld = fpu_op_w & ~kill_w;
   assign  fpu_op_w2_vld = fpu_op_w2 & ~flush_w2 & ~ecc_kill_rs2_w2;
   assign  fpu_op_w3_vld = fpu_op_w3 & ~ue_trap_w3 & ~rollback_rs1_w3;
   // don't qual with inst_vld since it takes too much time?
   // Resolved with Sanjay:
   //    Will never receive ack in the same cycle req was first made
   assign  fpop1_ready_w2_next = (fpu_op_w3_vld |
                                                         (fpop1_ready_w2 & ~lsu_ffu_ack));
 
   dffr #1 fpop1_w2_dff(.din (fpop1_ready_w2_next),
                                   .q   (fpop1_ready_w2),
                                   .rst (reset),
                                   .clk (clk), .se(se), .si(), .so());
 
   // once op1 has been accepted, move to w2, and in the next cycle op2 is ready
   //
   // C1 -- recv ack, send op1 (fpop1_ready_w2)
   // C2 -- send op2 (fpop2_ready_w3)
   assign fpop2_ready_w3_next = fpop1_ready_w2 & lsu_ffu_ack;
 
   dff fpop2_w22w3(.din (fpop2_ready_w3_next),
                               .q   (fpop2_ready_w3),
                               .clk(clk), .se(se), .si(), .so());
 
 
   // request in W2 and wait till an ack is received
   //    Will never receive ack in the same cycle req was first made
   assign ffu_lsu_fpop_rq_vld = fpu_op_w3_vld;
 
   // valid pkt sent to lsu (after request)
   assign issue_fpop2 = fpop2_ready_w3 & ~opf[7];// not conversion op
   assign  lsu_pkt_vld = fpop1_ready_w2 | fpu_op_w3_vld | issue_fpop2 | store_ready;
 
   assign lsu_pkt_type[1:0] = {store_ready, fpop2_ready_w3};
 
   // Create packet for LSU: ffu_lsu_data[80:0]
   //     80 = vld
   //     79:78 = type (00 = fpu operand 1, 01 = fpu operand 2, 10 = fp store)
   //     77:76 = tid
   //     75:68 = floating point opcode
   //     67:66 = fcc
   //     65:64 = rounding mode
   //     63:0 = data
   assign ffu_lsu_data[80:64] = {lsu_pkt_vld,
                                 lsu_pkt_type[1:0],
                                 extra_tid[1:0],
                                 opf[7:0],
                                 fcc_num[1:0],
                                 fpu_rnd[1:0]};  // rounding mode
 
   // Select data to send to LSU.  This is calculated one cycle early and flopped
   assign output_sel_rs1_next = fpop2_ready_w3_next & ~fst_e & ~bst_issue_c3_next;     // rs2 is sent first (fpop1)
   assign output_sel_frf_next = fst_e & ~stfsr_e | bst_issue_c3_next;   // store data
   assign output_sel_fsr_next = fst_e & stfsr_e & ~bst_issue_c3_next;
   assign output_sel_rs2_next = ~(fpop2_ready_w3_next | fst_e | bst_issue_c3_next);
   assign ctl_dp_output_sel_rs1 = output_sel_rs1 & ~rst_tri_en;
   assign ctl_dp_output_sel_frf = output_sel_frf & ~rst_tri_en;
   assign ctl_dp_output_sel_fsr = output_sel_fsr & ~rst_tri_en;
   assign ctl_dp_output_sel_rs2 = output_sel_rs2 | rst_tri_en;
   dff #(4) output_sel_dff(.din({output_sel_rs1_next,output_sel_rs2_next,output_sel_frf_next,output_sel_fsr_next}),
                           .q({output_sel_rs1,output_sel_rs2,output_sel_frf,output_sel_fsr}),
                           .clk(clk), .se(se), .si(), .so());
 
 
   dff #1 sfsrw_ff(.din (ctl_dp_output_sel_fsr),
                               .q   (stfsr_w),
                               .clk (clk), .se(se), .si(), .so());
   dff stfsr_wdff(.din(stfsr_qual_w), .clk(clk), .q(stfsr_w2), .se(se), .si(), .so());
   assign stfsr_qual_w =  (stfsr_w & ~kill_w);
   assign stfsr_w2_vld = stfsr_w2 & ~flush_w2;
 
 
   //------------------------------------------------------
   //  Block Stores
   //------------------------------------------------------
   // interface with lsu.  bst packet issues in c3
   // check for stb_full so it doesn't confuse lsu.  Don't have to count inflight packets
   // because none exist by bst_issue_c2
   assign        ffu_lsu_blk_st_e = bst_issue_c2 & ~stb_full_c2;
   assign        ffu_lsu_blk_st_va_e[5:3] = bst_cnt[2:0];
   assign        bst_done = bst_issue_c4 & (bst_cnt[2:0] == 3'b111) & ~bst_ce_c4 & ~(bst_ue_c4 & nceen);
 
   mux4ds stb_full_mux (.dout(stb_full_c2),
                        .in0(stb_full0),
                        .in1(stb_full1),
                        .in2(stb_full2),
                        .in3(stb_full3),
                        .sel0(ctl_dp_fp_thr[0]),
                        .sel1(ctl_dp_fp_thr[1]),
                        .sel2(ctl_dp_fp_thr[2]),
                        .sel3(ctl_dp_fp_thr[3]));
 
   assign        other_mem_op_e = exu_ffu_ist_e | ifu_tlu_flsh_inst_e | ifu_lsu_ld_inst_e;
   assign        can_issue_bst_c2  = (~other_mem_op_e & ~stb_full_c2);
   assign bst_m = fst_m & blk_asi_m;
 
   assign bst_rs[5:0] = {rd[5:4], bst_cnt[2:0], 1'b0};
 
   // bst starts when bst hits w and is done when the 7th pckt has issued
   assign bst_issue_c1_next = ((bst_w & ~kill_w) |
                               (bst_issue_c4 & ~(bst_cnt[2:0] == 3'b111) & ~bst_ce_c4 &
                                ~(bst_ue_c4 & nceen)) | bst_issue_c6);
 
   // sotheas,9/14/04: fixed eco 6910, suppress block store start on dtlb perr
   //                  using registered version of lsu_ffu_st_dtlb_perr_g
   //   WAS:
   //        assign bst_issue_c2_next = ((bst_issue_c1 & ~(any_op_w2 & flush_w2)) | (bst_issue_c2 & ~can_issue_bst_c2)) & ~reset;
   //   IS:
   dff #1 st_dtlbperr_ff(.din (!lsu_ffu_st_dtlb_perr_g),
                               .q   (st_dtlb_perr_w2_l),
                               .clk (clk), .se(se), .si(), .so());
   assign bst_issue_c2_next = ((bst_issue_c1 & ~(any_op_w2 & flush_w2) & st_dtlb_perr_w2_l)
                             | (bst_issue_c2 & ~can_issue_bst_c2)) & ~reset;
   assign bst_issue_c3_next = bst_issue_c2 & can_issue_bst_c2 & ~reset;
   assign bst_issue_c4_next = bst_issue_c3 & ~reset;
   assign bst_issue_c5_next = bst_issue_c4 & bst_ce_c4 & ~reset;
   assign bst_issue_c6_next = bst_issue_c5 & ~reset;
 
   // bst keeps reading in both c1 and c2 in case it stalls in c2
   assign bst_read_req = bst_issue_c1 | bst_issue_c2;
   // counter resets to 1 when bst hits w, increments when one is issued to lsu without ce
   assign bst_cnt_next[2:0] = (bst_w?                            3'b001:
                               (bst_issue_c4 & ~bst_ce_c4)?  (bst_cnt[2:0] + 3'b001):
                                               bst_cnt[2:0]);
 
   ///////////////////
   // bst starvation
   //----------------
   // when six bit counter saturates then a req to stall inst issue is made
   // The request stays high until a bst gets issued
   ///////////////////
   assign ffu_ifu_stallreq = bst_stall_req;
   assign bst_stall_req_next = ((bst_stall_cnt[5:0] == 6'b111111) & bst_issue_c2 & ~can_issue_bst_c2 |
                                bst_stall_req & other_mem_op_e);
   assign bst_stall_cnt_next[5:0] = (~bst_issue_c2)? 6'd0: bst_stall_cnt[5:0] + 6'd1;
 
   /////////////////////
   // bst ecc control
   /////////////////////
   // if a ce occurs even after correction then it is converted to a ue
   assign bst_ue_c4 = bst_issue_c4 & (previous_ue | (fixed_bst_ce & |previous_ce[1:0]));
   assign bst_ce_c4 = bst_issue_c4 & |previous_ce[1:0] & ~fixed_bst_ce & ~previous_ue;
   assign fixed_bst_ce_next = bst_ce_c4 | (fixed_bst_ce & ~bst_issue_c4);
 
   dff #(4) stb_full_dff(.din({lsu_ffu_stb_full0,lsu_ffu_stb_full1,lsu_ffu_stb_full2,lsu_ffu_stb_full3}),
                         .q({stb_full0, stb_full1, stb_full2, stb_full3}),
                         .clk(clk), .se(se), .si(), .so());
   dff blk_asi_dff(.din(lsu_ffu_blk_asi_e), .clk(clk), .q(blk_asi_m),
                   .se(se), .si(), .so());
   dffr bst_fix_ce_dff(.din(fixed_bst_ce_next), .clk(clk), .q(fixed_bst_ce),
                       .se(se), .si(), .so(), .rst(reset));
   dff #(3) bst_cnt_dff(.din(bst_cnt_next[2:0]), .clk(clk), .q(bst_cnt[2:0]),
                        .se(se), .si(), .so());
   dff bst_m2w(.din(bst_m), .clk(clk), .q(bst_w), .se(se), .si(), .so());
   dff bst_issue_c1_dff(.din(bst_issue_c1_next), .clk(clk), .q(bst_issue_c1), .se(se),
                     .si(), .so());
   dff bst_issue_c2_dff(.din(bst_issue_c2_next), .clk(clk), .q(bst_issue_c2), .se(se),
                     .si(), .so());
   dff bst_issue_c3_dff(.din(bst_issue_c3_next), .clk(clk), .q(bst_issue_c3), .se(se),
                     .si(), .so());
   dff bst_issue_c4_dff(.din(bst_issue_c4_next), .clk(clk), .q(bst_issue_c4), .se(se),
                     .si(), .so());
   dff bst_issue_c5_dff(.din(bst_issue_c5_next), .clk(clk), .q(bst_issue_c5), .se(se),
                     .si(), .so());
   dff bst_issue_c6_dff(.din(bst_issue_c6_next), .clk(clk), .q(bst_issue_c6), .se(se),
                     .si(), .so());
   dff #(6) bst_stall_cntdff(.din(bst_stall_cnt_next[5:0]), .clk(clk), .q(bst_stall_cnt[5:0]),
                             .se(se), .si(), .so());
   dffr bst_stall_reqdff(.din(bst_stall_req_next), .clk(clk), .q(bst_stall_req),
                        .se(se), .si(), .so(), .rst(reset));
 
//----------------------------------------
// Decode Returning FPU/LSU packets
//----------------------------------------
 
   // FPU result pulled off of cpx
   assign is_fpu_result = (cpx_req_d1 == 4'b1000) ?
                           cpx_vld_d1 & fp_pending : 1'b0;
   assign ld_ret = lsu_ffu_ld_vld & ~(thr_match_fpw2 & flush_w2) & (blk_load_pending | load_pending);
 
   // select frf write data
   // don't write data on Fcompares
   assign ctl_dp_rs2_sel_fpu_lsu = is_fpu_result & ~cpx_fcmp_d1 | ld_ret;
   assign ctl_dp_rs2_sel_vis = vis_result & ~ctl_dp_rs2_sel_fpu_lsu;
   assign ctl_dp_rs2_frf_read = (ren_rs2_w | ctl_dp_rd_ecc) & ~ctl_dp_rs2_sel_fpu_lsu & ~vis_result;
   assign ctl_dp_rs2_keep_data = ~(ren_rs2_w | ctl_dp_rd_ecc | vis_result |
                                   ctl_dp_rs2_sel_fpu_lsu);
 
   // selects for rs2 result mux
   assign ctl_dp_rd_ecc = fst_ce_w | rollback_rs2_w2 | bst_ce_c4 | rollback_rs1_w3;
 
   // Selects for rs1 mux
   assign ctl_dp_new_rs1 = ren_rs1_w2;
 
//----------------------------------------
// FRF Controls
//----------------------------------------   
   // WEN for frf from load, FPU result or mov
   assign external_wen_next = ld_ret & ~(ldfsr | ldxfsr) | (is_fpu_result & ~cpx_fcmp_d1 & ~take_ieee_trap);
   assign rf_ecc_gen_next = external_wen_next | vis_wen_next;
 
   dff rf_eccgen_dff(.din(rf_ecc_gen_next), .q(rf_ecc_gen), .clk(clk), .se(se), .si(), .so());
   dff rf_wen_dff(.din(rf_wen_next), .q(rf_wen), .clk(clk), .se(se), .si(), .so());
   // check for flush_pipe for moves
   assign rf_wen_next = rf_ecc_gen & ~(any_op_w2 & flush_w2) | move_wen_w2_valid;
 
 
   // REN and WEN must be mutually exclusive.  This works because WEN is always after W
   // if a new fpop has arrived to cancel it.
   // The even register is the upper half, odd is the lower half
   assign ctl_frf_wen[1] = ((rf_wen & ~rd[0]) | ecc_wen[1]) & ~ctl_frf_ren;   // double or even sgl
   assign ctl_frf_wen[0] = ((rf_wen & (~dest_single | rd[0])) | ecc_wen[0]) & ~ctl_frf_ren; // dbl or odd sgl
 
   // REN for frf  -- rd rs2 in D, rs1 in E
   assign read_rs2 = ren_rs2_e;
   assign read_rs1 = ren_rs1_m;
   assign read_rd = ifu_ffu_fst_d;
   assign read_bst = bst_read_req;
   // expanded out the terms for reading rs2 to help timing
   assign ctl_frf_ren = (read_rs1 | read_rs2 |
                         ifu_ffu_fst_d | bst_read_req);
 
   assign early_frf_rnum[5:1] = read_rs2?  rs2_next[5:1]:
                                read_rs1?  rs1[5:1]:
                                read_bst?  bst_rs[5:1]:
                                           write_addr[5:1];
   assign     st_rd_d[5:1] = {ifu_ffu_frd_d[0] & ~ifu_ffu_ldst_single_d, ifu_ffu_frd_d[4:1]};
   mux2ds #5 frf_rnum_mux(.dout(frf_rnum[5:1]),
                            .in0(early_frf_rnum[5:1]),
                            .in1(st_rd_d[5:1]),
                            .sel0(~read_rd),
                            .sel1(read_rd));
 
   assign frf_tid[1:0] = (read_rd)? ifu_ffu_tid_d[1:0]: tid_next[1:0];
 
   assign wen_rs2_ecc = |ecc_wen[1:0] & ren_rs2_w4;
   assign wen_rs1_ecc = |ecc_wen[1:0] & ren_rs1_w5;
   assign blk_rd[5:1] = rd[5:1] + {2'b0, bld_cnt_d3[2:0]};
   assign write_addr[5:1] = wen_rs2_ecc?          rs2[5:1] :
                            wen_rs1_ecc?          rs1[5:1] :
                            bst_issue_c6?         bst_rs[5:1]:
                            blk_load_pending?     blk_rd[5:1]:
                                                  rd[5:1];
 
   // Address is combination of tid and rnum
   assign ctl_frf_addr[6:0] = {frf_tid[1:0], frf_rnum[5:1]};
 
//----------------------------------------
// Data from FPU forwarded to IFU
//----------------------------------------
   // Send thrid to IFU
   assign ffu_ifu_tid_w2[1:0] = tid;
 
   // completion is always signalled after the w-stage so that flush_pipe, etc.
   // can be checked.  For lds and fpops this is signalled after they write.
   // ecc_kill_rs2_w is checked for move and fst because the "compeletion"
   // is signalled over a separate interface so rollback can occur.
   // This is staged 2 cycles to allow for the cycle of ecc generation.
   //
   assign ffu_op_done_next = ((is_fpu_result & ~take_ieee_trap) | fld_done |
                              blk_ld_done | bst_done | vis_result |
                              fst_w & ~bst_w & ~kill_w);
   dff ffu_op_done_dff(.din(ffu_op_done_next), .clk(clk), .q(ffu_op_done),
                       .se(se), .si(), .so());
   // sotheas,9/14/04: fixed eco 6910, send done on dtlb perr for block store
   //                  using registered version of lsu_ffu_st_dtlb_perr_g
   //   WAS:
   //     assign ffu_op_done_vld = ffu_op_done & ~(any_op_w2 & flush_w2) | move_w2_vld;
   assign ffu_op_done_vld = (ffu_op_done | (bst_issue_c1 & !st_dtlb_perr_w2_l) )
                            & ~(any_op_w2 & flush_w2) | move_w2_vld;
   dff ffu_op_done2_dff(.din(ffu_op_done_vld), .clk(clk), .q(ffu_ifu_fpop_done_w2),
                        .se(se), .si(), .so());
 
//------------------------------------------
// FSR Controls
//------------------------------------------
 
   assign ctl_dp_fp_thr[0] = ~extra_tid[1] & ~extra_tid[0];
   assign ctl_dp_fp_thr[1] = ~extra_tid[1] &  extra_tid[0];
   assign ctl_dp_fp_thr[2] =  extra_tid[1] & ~extra_tid[0];
   assign ctl_dp_fp_thr[3] =  extra_tid[1] &  extra_tid[0];
 
   // CC's
   assign fcc_num_dec[0] = ~fcc_num[1] & ~fcc_num[0];
   assign fcc_num_dec[1] = ~fcc_num[1] & fcc_num[0];
   assign fcc_num_dec[2] = fcc_num[1] & ~fcc_num[0];
   assign fcc_num_dec[3] = fcc_num[1] & fcc_num[0];
 
   // selects to load next fsr from
   // stfsr or fmov always clear ftt
   assign clear_ftt = stfsr_w2_vld | move_w2_vld | is_fpu_result;
 
   assign ctl_dp_fsr_sel_fpu[3:0] = ({4{is_fpu_result | move_w2_vld | take_other_trap | stfsr_w2_vld}}
                                     & ctl_dp_fp_thr[3:0]);
   assign ctl_dp_fsr_sel_ld[3:0] =  ({4{ld_ret & (ldfsr | ldxfsr)}} &
                                     ~ctl_dp_fsr_sel_fpu[3:0] & ctl_dp_fp_thr[3:0]);
   assign ctl_dp_fsr_sel_old[3:0] =  (~ctl_dp_fsr_sel_fpu[3:0] & ~ctl_dp_fsr_sel_ld[3:0]);
 
   // align fcc depending on which fcc_num was used
   mux4ds #8 fcc_ret_mux(.dout (fpu_fcc[7:0]),
                         .in0  ({dp_ctl_fsr_fcc[7:2], cpx_fccval_d1[1:0]}),
                         .in1  ({dp_ctl_fsr_fcc[7:4], cpx_fccval_d1[1:0], dp_ctl_fsr_fcc[1:0]}),
                         .in2  ({dp_ctl_fsr_fcc[7:6], cpx_fccval_d1[1:0], dp_ctl_fsr_fcc[3:0]}),
                         .in3  ({cpx_fccval_d1[1:0], dp_ctl_fsr_fcc[5:0]}),
                         .sel0 (fcc_num_dec[0]),
                         .sel1 (fcc_num_dec[1]),
                         .sel2 (fcc_num_dec[2]),
                         .sel3 (fcc_num_dec[3]));
 
   // set fcc if this was an fcmp instruction
   assign fcc_sel_fpu = cpx_fcmp_d1 & ~ieee_trap & is_fpu_result;
   assign fcc_sel_ld = ~is_fpu_result & ldfsr_vld;
   assign fcc_sel_ldx = ~is_fpu_result & ~ldfsr_vld & ldxfsr_vld;
   assign fcc_sel_old = ~fcc_sel_fpu & ~fcc_sel_ld & ~fcc_sel_ldx;
   mux4ds #8 fcc_set_mux(.dout (ctl_dp_fcc_w2[7:0]),
                                           .in0  (dp_ctl_fsr_fcc[7:0]),
                                           .in1  (fpu_fcc[7:0]),
                                           .in2  (dp_ctl_ld_fcc[7:0]),
                                           .in3  ({dp_ctl_fsr_fcc[7:2], dp_ctl_ld_fcc[1:0]}),
                                           .sel0 (fcc_sel_old),
                                           .sel1 (fcc_sel_fpu),
                                           .sel2 (fcc_sel_ldx),
                                           .sel3 (fcc_sel_ld));
 
   // get fcc's from ldfsr instruction
   assign ldfsr_vld = ldfsr & load_pending;
   assign ldxfsr_vld = ldxfsr & load_pending;
 
   wire   cc_changed_w2;
 
   // fcc set by fcmp, ldfsr or ldxfsr
   assign cc_changed = fcc_sel_fpu |
                             fld_done & (ldfsr_vld | ldxfsr_vld);
 
   dff cc_changed_dff(.din(cc_changed), .clk(clk), .q(cc_changed_w2),
                      .se(se), .si(), .so());
   dff #(8) cc_next(.din(ctl_dp_fcc_w2[7:0]), .clk(clk), .q(ffu_ifu_cc_w2[7:0]),
                    .se(se), .si(), .so());
 
   assign ffu_ifu_cc_vld_w2[3:0] = ctl_dp_fp_thr[3:0] & {4{cc_changed_w2}};
 
//-----------------------------------
// Traps
//-----------------------------------   
 
   // illegal instruction if blk ld/st is not 8 dp regs aligned
   dff illegal_vis_e2m (.din(illegal_vis_e), .clk(clk), .q(illegal_vis_m),
                        .se(se), .si(), .so());
   assign illegal_blk_m = (blk_ld_m | bst_m) & (rd[0] | rd[1] | rd[2] | rd[3]) & ~dest_single;
   assign ffu_tlu_ill_inst_m = illegal_blk_m | illegal_vis_m;
 
   assign ctl_dp_ftt_w2 = take_ieee_trap      ? 3'b001 :
                          unimpl_qual_w2        ? 3'b011 :
                          clear_ftt           ? 3'b000 :
                                                3'bxxx;
 
// SPARC V9 Underflow, Overflow, Inexact behavior: 
//
//      Exception(s)             |            Current
//      Detected    Trap Enable  | fp_        Exception
//      in f.p.     Mask Bits    | exception_ Bits (in
//      operation   (in FSR.TEM) | ieee_754   FSR.cexc)   
//      ----------- ------------ | Trap       ----------- 
//      of  uf  nx  OFM UFM NXM  | Occurs?    ofc ufc nxc  Notes
//      --- --- --- --- --- ---  | ---------- --- --- ---  -----
//       -   -   -   x   x   x   |  no         0   0   0   
//       -   -   *   x   x   0   |  no         0   0   1 
//       -   *   *   x   0   0   |  no         0   1   1
//       *   -   *   0   x   0   |  no         1   0   1    (2)
//                               | 
//       -   -   *   x   x   1   |  yes        0   0   1 
//       -   *   *   x   0   1   |  yes        0   0   1 
//       -   *   -   x   1   x   |  yes        0   1   0
//       -   *   *   x   1   x   |  yes        0   1   0 
//       *   -   *   1   x   x   |  yes        1   0   0    (2)
//       *   -   *   0   x   1   |  yes        0   0   1    (2)
//
//      (2) Overflow is always accompanied by inexact.
//
//
// The FPU does not receive FSR.TEM bits. FSR.TEM bits are used within
// the FFU for the following cases:
// (1) fp_exception_ieee_754 trap detection
//     If a FPop generates an IEEE exception (nv, of, uf, dz, nx) for
//     which the corresponding trap enable (TEM) is set, then a
//     fp_exception_ieee_754 trap is caused. FSR.cexc field has one bit
//     set corresponding to the IEEE exception, and FSR.aexc field is
//     unchanged.
// (2) Clear FSR.nxc if an overflow (underflow) exception does trap
//     because FSR.OFM (FSR.UFM) is set, regardless of whether FSR.NXM
//     is set. Set FSR.ofc (FSR.ufc).
// (3) Clear FSR.ofc (FSR.ufc) if overflow (underflow) exception traps
//     and FSR.OFM (FSR.UFM) is not set and FSR.NXM is set. Set FSR.nxc.
// (4) Clear FSR.ufc if the result is exact (FSR.nxc is not set) and
//     FSR.UFM is not set. This case represents an exact denormalized
//     result.
//
// Note: - FPU will signal underflow to the FFU for all "tiny" results.
//       - FPU always reports inexact along with overflow.
   dff #(5) tem_dff(.din(dp_ctl_fsr_tem[4:0]), .clk(clk), .q(fsr_tem_d1),
                    .se(se), .si(), .so());
   assign fpexc_nxc =
          cpx_fpexc_d1[0] &
          ~(( fsr_tem_d1[3] & cpx_fpexc_d1[3]) |    // enabled  of
            ( fsr_tem_d1[2] & cpx_fpexc_d1[2])  );  // enabled  uf
 
   assign fpexc_ofc =
          cpx_fpexc_d1[3] &
          ~(~fsr_tem_d1[3] & fsr_tem_d1[0] & cpx_fpexc_d1[0]); // disabled of and enabled nx
 
   assign fpexc_ufc =
          cpx_fpexc_d1[2] &
          ~(~fsr_tem_d1[2] & ( fsr_tem_d1[0] & cpx_fpexc_d1[0])) & // disabled uf & enabled nx
          ~(~fsr_tem_d1[2] & ~cpx_fpexc_d1[0]) ; // disabled uf with no inexact
                                                               // (i.e. exact denorm w/ UFM=0)
 
 
   assign ieee_trap_vec[4:0] =
          ({cpx_fpexc_d1[4],
            fpexc_ofc,
            fpexc_ufc,
            cpx_fpexc_d1[1],
            fpexc_nxc       } & fsr_tem_d1[4:0]);
 
 
   // ieee trap has least priority.  Put through a flop for timing reasons
   assign ieee_trap = (|ieee_trap_vec[4:0]);
   assign take_ieee_trap = ieee_trap & is_fpu_result;
   dff trap_ieee_dff(.din(take_ieee_trap), .clk(clk), .q(ffu_tlu_trap_ieee754),
                     .se(se), .si(), .so());
 
   assign take_other_trap = unimpl_qual_w2;
   assign ffu_tlu_trap_other = take_other_trap;
   assign ffu_tlu_trap_ue = ue_trap_w3;
 
   // current exception
   assign fp_exc_w2[4:0] =
          ({cpx_fpexc_d1[4],
            fpexc_ofc,
            fpexc_ufc,
            cpx_fpexc_d1[1],
            fpexc_nxc       });
 
 
 
 
   // accrued exceptions
   // fp_exc_w2 = dp_ctl_fsr_aexc | cpx_fpexc_d1 & {5{~take_ieee_trap}};
   assign fp_exc_w2[9] = dp_ctl_fsr_aexc[4] |
                             is_fpu_result & cpx_fpexc_d1[4] & ~fsr_tem_d1[4];
   assign fp_exc_w2[6] = dp_ctl_fsr_aexc[1] |
                             is_fpu_result & cpx_fpexc_d1[1] & ~fsr_tem_d1[1];
   assign fp_exc_w2[7] = dp_ctl_fsr_aexc[2] |
                             is_fpu_result & fpexc_ufc & ~fsr_tem_d1[2];
   assign fp_exc_w2[8] = dp_ctl_fsr_aexc[3] |
                             is_fpu_result & fpexc_ofc & ~fsr_tem_d1[3];
   assign fp_exc_w2[5] = dp_ctl_fsr_aexc[0] |
                             is_fpu_result & fpexc_nxc & ~fsr_tem_d1[0];
 
   assign ctl_dp_exc_w2[9:5] = fp_exc_w2[9:5];
   // move, abs, etc will clear cexc, fpu_results will update, all else will leave unchanged
   wire   update_cexc;
   assign update_cexc = is_fpu_result | move_w2_vld;
   assign ctl_dp_exc_w2[4:0] = ((update_cexc)? fp_exc_w2[4:0] & {5{is_fpu_result}}:
                                dp_ctl_fsr_cexc[4:0]);
 
 
 
   ////////////////////////////////
   // ECC control
   ////////////////////////////////
   // Generation of the parity bit for writes
   wire [13:0] gen_synd_d1;
   wire        gen_par_hi;
   wire        gen_par_low;
   wire [6:0]  error_inj_data;
   output [13:0] ctl_frf_write_synd;
   dff #(14) gen_synd_dff (.din({dp_ctl_synd_out_high[6:0],dp_ctl_synd_out_low[6:0]}),
                           .q(gen_synd_d1[13:0]), .clk(clk), .se(se), .si(), .so());
   assign  gen_par_hi = ^gen_synd_d1[13:7];
   assign  gen_par_low = ^gen_synd_d1[6:0];
   assign  ctl_frf_write_synd[13:0] = ({gen_par_hi,gen_synd_d1[12:7],gen_par_low,gen_synd_d1[5:0]} ^
                                       {error_inj_data[6:0],error_inj_data[6:0]});
   /////////////////////////////////
   // error injection
   /////////////////////////////////
   // injection doesn't check for flush on wen
   assign  inject_err_next = ifu_ffu_inj_frferr & rf_wen_next;
   assign error_inj_data[6:0] = {7{inject_err}} & err_data[6:0];
   dff #(7) err_data_dff(.din(ifu_exu_ecc_mask[6:0]),
                     .q(err_data[6:0]),
                     .clk(clk), .se(se), .si(), .so());
   dff err_cntl(.din(inject_err_next),
                .q(inject_err),
                .clk(clk), .se(se), .si(), .so());
   // speculate on error injection (don't check flush_pipe etc)
   assign ffu_ifu_inj_ack = inject_err;
 
 
   // check the upper half on a double or a single with an even reg num
   // check the lower half on a double or a single with an odd reg num
   // ecc block will run on frf input for reads
   // otherwise it will run on the rd_data
   assign check_ecc_next = ren_rs2_m | fst_e | ren_rs1_w | bst_issue_c3_next;
   dff check_ecc_dff(.din(check_ecc_next), .clk(clk), .q(ctl_dp_ecc_sel_frf),
                     .se(se), .si(), .so());
   // rs1 will not be checked if a ce was detected on rs2.  If there was a ue on rs2
   // rs1 will be checked and a ce will be corrected, but the error on rs2 will be logged
   assign chk_rs1_w2 = ren_rs1_w2;
   assign chk_ecc_m[1] = fst_m & ~rd[0] & ~output_sel_fsr;
   assign chk_ecc_m[0] = fst_m & (~dest_single | rd[0]) & ~output_sel_fsr;
   assign chk_ecc_w[1] = ren_rs2_w & ~kill_eccchk_w & ~rs2[0];
   assign chk_ecc_w[0] = ren_rs2_w & ~kill_eccchk_w & (~source_single | rs2[0]);
   assign chk_ecc_w2[1] = chk_rs1_w2 & ~rs1[0];
   assign chk_ecc_w2[0] = chk_rs1_w2 & (~source_single | rs1[0]);
 
   assign chk_ecc[1:0] = chk_ecc_m[1:0] | chk_ecc_w[1:0] | chk_ecc_w2[1:0] | {2{bst_issue_c3}};
   dff #(2) chk_ecc_dff(.din(chk_ecc[1:0]), .clk(clk), .q(chk_ecc_prev[1:0]),
                        .se(se), .si(), .so());
 
   assign     error_detected[1] = |dp_ctl_synd_out_high[5:0];
   assign     error_detected[0] = |dp_ctl_synd_out_low[5:0];
 
   assign     possible_ue[1] = ~dp_ctl_synd_out_high[6] & chk_ecc[1];
   assign     possible_ue[0] = ~dp_ctl_synd_out_low[6] & chk_ecc[0];
   assign     ce[1] = dp_ctl_synd_out_high[6] & chk_ecc[1];
   assign     ce[0] = dp_ctl_synd_out_low[6] & chk_ecc[0];
 
   assign rollback_fst_m = ((dp_ctl_synd_out_high[6] & chk_ecc_m[1] & ~disable_ce_m) |
                        (dp_ctl_synd_out_low[6] & chk_ecc_m[0] & ~disable_ce_m));
   dff rollback_m2w(.din(rollback_fst_m), .clk(clk), .q(rollback_fst_w), .se(se), .si(), .so());
   dff #(2) possible_ue_dff(.din(possible_ue[1:0]), .clk(clk), .q(prev_poss_ue[1:0]),
                            .se(se), .si(), .so());
   dff #(2) ce_dff(.din(ce[1:0]), .clk(clk), .q(previous_ce[1:0]),
                            .se(se), .si(), .so());
   dff #(2) err_det_dff(.din(error_detected[1:0]), .clk(clk), .q(prev_err_detected[1:0]),
                            .se(se), .si(), .so());
   assign previous_ue = |(prev_err_detected[1:0] & prev_poss_ue[1:0]);
 
   dff #(2) ecc_wen1_dff(.din(ecc_wen_gen_next[1:0]), .clk(clk), .q(ecc_wen_gen[1:0]),
                        .se(se), .si(), .so());
   dff #(2) ecc_wen2_dff(.din(ecc_wen_next[1:0]), .clk(clk), .q(ecc_wen[1:0]),
                        .se(se), .si(), .so());
   // if the ecc error was in the m stage we need to check for a kill
   // if the ecc error was in the w stage we need to check flush
   // ECC errors on rs1 will not be written back to the frf.  The data that is used will be corrected.
   assign ecc_wen_gen_next[1:0] = previous_ce[1:0] &
          {2{bst_issue_c4 | fst_ce_w | rollback_rs2_w2 | rollback_rs1_w3}};
   assign ecc_wen_next = ecc_wen_gen[1:0] & {2{~(fst_ce_w2 & flush_w2)}};
 
   // pass along ce and ue so trap can be signalled to ffu and tlu
   // if disable_ce_m then don't tell ifu reissue ce.  Instead convert to a ue.
   dff disable_ce_e2m(.din(ifu_exu_disable_ce_e), .clk(clk), .q(disable_ce_m),
                      .se(se), .si(), .so());
   dff disable_ce_m2w(.din(disable_ce_m), .clk(clk), .q(disable_ce_w),
                      .se(se), .si(), .so());
   assign fst_ce_w = rollback_fst_w & ~kill_eccchk_w;
   assign fst_ue_w = fst_w & (previous_ue | (disable_ce_w & |(previous_ce[1:0])))  & ~kill_eccchk_w;
   assign rollback_rs2_w2 = (ren_rs2_w2 & ~flush_w2 & |previous_ce[1:0]
                             & ~rolled_back);
   assign rs2_ce_w2 = ren_rs2_w2 & |previous_ce[1:0] & ~rolled_back & ~previous_ue;
   assign rs2_ue_w2 = ren_rs2_w2 & (previous_ue | (rolled_back & |previous_ce[1:0]));
   // must check for flush because eccchk doesn't do this
   assign rs2_fst_ce_w2_vld = (rs2_ce_w2 | fst_ce_w2) & ~flush_w2;
   assign rs2_fst_ue_w2_vld = (rs2_ue_w2 | fst_ue_w2) & ~flush_w2;
   dff ce_w2w2(.din(fst_ce_w), .clk(clk), .q(fst_ce_w2),
               .se(se), .si(), .so());
   dff ue_w2w2(.din(fst_ue_w), .clk(clk), .q(fst_ue_w2),
               .se(se), .si(), .so());
   dff ce_w22w3(.din(rs2_fst_ce_w2_vld), .clk(clk), .q(rs2_fst_ce_w3),
               .se(se), .si(), .so());
   dff ue_w22w3(.din(rs2_fst_ue_w2_vld), .clk(clk), .q(rs2_fst_ue_w3),
               .se(se), .si(), .so());
 
   assign rs1_ce_w3 = ren_rs1_w3 & |previous_ce[1:0] & ~previous_ue & ~rolled_back;
   assign rollback_rs1_w3 = rs1_ce_w3 & ~ue_trap_w3;
   assign ce_w3 = (rs1_ce_w3 | rs2_fst_ce_w3);
   assign ue_w3 = (ren_rs1_w3 & (previous_ue | (rolled_back & |previous_ce[1:0]))) | rs2_fst_ue_w3;
 
   assign ffu_ifu_ecc_ce_w2 = (ce_w3 | bst_ce_c4);
   assign ffu_ifu_ecc_ue_w2 = (ue_w3 | bst_ue_c4);
 
   // error logging signals.  The error register priority is fst, bst, rs1_ue, rs2_ue, rs1_ce, rs2_ce
   assign log_new_err = (ren_rs2_w2 | bst_issue_c4 | fst_w |
                         (ren_rs1_w3 & previous_ue) | (rs1_ce_w3 & ~rs2_fst_ue_w3));
   assign new_err_reg[5:0] = fst_w ?        rd[5:0]:
                             bst_issue_c4 ? bst_rs[5:0]:
                             ren_rs2_w2 ?    rs2[5:0]:
                                            rs1[5:0];
   assign err_reg_next[5:0] = (log_new_err) ? new_err_reg[5:0] : err_reg_d1[5:0];
   dff #(6) err_reg_dff(.din(err_reg_next[5:0]), .clk(clk), .q(err_reg_d1[5:0]),
                        .se(se), .si(), .so());
   assign ffu_ifu_err_reg_w2[5:0] = err_reg_d1[5:0];
 
   // storage of error syndrome for logging
   // For singles the invalid half of the syndrome is zeroed out.
   // The syndrome reported to the ifu will be latched until a new error is detected
   assign      new_err_synd[13:7] = gen_synd_d1[13:7] & {7{chk_ecc_prev[1]}};
   assign      new_err_synd[6:0] = gen_synd_d1[6:0] & {7{chk_ecc_prev[0]}};
   assign      err_synd_next[13:0] = (log_new_err)? new_err_synd: err_synd_d1;
   dff #(14) err_synd_d1ff(.din(err_synd_next[13:0]), .clk(clk), .q(err_synd_d1[13:0]),
                          .se(se), .si(), .so());
   assign      ffu_ifu_err_synd_w2[13:0] = err_synd_d1[13:0];
 
   // kill moves and fpu ops
   assign ecc_kill_rs2_w2 = rollback_rs2_w2 | (rs2_ue_w2 & nceen);
 
 
   // pipe along enable signal for ue traps
   assign nceen_next = (any_op_e)? ifu_exu_nceen_e: (nceen & ~rollback_fst_w);
   dff nceen_dff(.din(nceen_next), .clk(clk), .q(nceen),
                 .se(se), .si(), .so());
   assign ue_trap_w3 = (ue_w3 | bst_ue_c4) & nceen;
 
   // signals for killing stores on ecc
   // use this to kill any rs2/rd ce   
   assign ffu_ifu_fst_ce_w = rollback_fst_w;
 
   // These signals kill the entry in the store buffer for any ce or trapping ue.  Very critical timing.
   assign possible_kill_st_ce_m = ((fst_m & ~output_sel_fsr & ~(disable_ce_m & ~nceen)) |
                                   (bst_issue_c3 & ~(fixed_bst_ce & ~nceen)));
   assign possible_kill_st_ue_m = (fst_m & ~output_sel_fsr & nceen | bst_issue_c3 & nceen);
   assign kill_st_ce_w = (|previous_ce[1:0]) & possible_kill_st_ce_w;
   assign ffu_lsu_kill_fst_w = (previous_ue)? possible_kill_st_ue_w: kill_st_ce_w;
   dff kill_fst_ce_dff(.din(possible_kill_st_ce_m), .clk(clk), .q(possible_kill_st_ce_w),
                       .se(se), .si(), .so());
   dff kill_fst_ue_dff(.din(possible_kill_st_ue_m), .clk(clk), .q(possible_kill_st_ue_w),
                       .se(se), .si(), .so());
 
   // rollback signals
   assign rollback_c1_next = rollback_rs2_w2 | rollback_rs1_w3;
   dffr #(3) rollback_dff(.din({rollback_c1_next,rollback_c1_vld,rollback_c2}),
                         .q({rollback_c1, rollback_c2, rollback_c3}),
                         .clk(clk), .se(se), .si(), .so(), .rst(reset));
   // if both rs1 and rs2 rollback then the state machine needs to start on rs1
   assign rollback_c1_vld = rollback_c1 & ~ue_trap_w3 & ~rollback_rs1_w3;
 
   assign rolled_back_next = rollback_c1_vld | rolled_back & ~any_op_e;
   dffr rollback_state(.din(rolled_back_next), .q(rolled_back),
                        .rst(reset), .clk(clk),
                        .se(se), .si(), .so());
 
   //////////////////////////////
   // Performance counter signals
   //////////////////////////////
   assign ffu_tlu_fpu_tid[1:0] = tid[1:0] & {2{is_fpu_result}}; // don't toggle wire if not needed
   assign ffu_tlu_fpu_cmplt = is_fpu_result;
 
   sparc_ffu_ctl_visctl visctl(
                               .illegal_vis_e(illegal_vis_e),
                               .vis_nofrf_e(vis_nofrf_e),
                               .visop_e (visop_e),
                               .visop_m (visop_m),
                               .visop_w_vld (visop_w_vld),
                               .vis_wen_next (vis_wen_next),
                               .ifu_ffu_rnd_e(frs2_e[2:0]),
                               .fpu_rnd (fpu_rnd[1:0]),
                               .vis_result(vis_result),
                               /*AUTOINST*/
                               // Outputs
                               .ctl_vis_sel_add(ctl_vis_sel_add),
                               .ctl_vis_sel_log(ctl_vis_sel_log),
                               .ctl_vis_sel_align(ctl_vis_sel_align),
                               .ctl_vis_add32(ctl_vis_add32),
                               .ctl_vis_subtract(ctl_vis_subtract),
                               .ctl_vis_cin(ctl_vis_cin),
                               .ctl_vis_align0(ctl_vis_align0),
                               .ctl_vis_align2(ctl_vis_align2),
                               .ctl_vis_align4(ctl_vis_align4),
                               .ctl_vis_align6(ctl_vis_align6),
                               .ctl_vis_align_odd(ctl_vis_align_odd),
                               .ctl_vis_log_sel_pass(ctl_vis_log_sel_pass),
                               .ctl_vis_log_sel_nand(ctl_vis_log_sel_nand),
                               .ctl_vis_log_sel_nor(ctl_vis_log_sel_nor),
                               .ctl_vis_log_sel_xor(ctl_vis_log_sel_xor),
                               .ctl_vis_log_invert_rs1(ctl_vis_log_invert_rs1),
                               .ctl_vis_log_invert_rs2(ctl_vis_log_invert_rs2),
                               .ctl_vis_log_constant(ctl_vis_log_constant),
                               .ctl_vis_log_pass_const(ctl_vis_log_pass_const),
                               .ctl_vis_log_pass_rs1(ctl_vis_log_pass_rs1),
                               .ctl_vis_log_pass_rs2(ctl_vis_log_pass_rs2),
                               .ffu_exu_rsr_data_hi_m(ffu_exu_rsr_data_hi_m[31:0]),
                               .ffu_exu_rsr_data_mid_m(ffu_exu_rsr_data_mid_m[2:0]),
                               .ffu_exu_rsr_data_lo_m(ffu_exu_rsr_data_lo_m[7:0]),
                               .ctl_dp_wsr_data_w2(ctl_dp_wsr_data_w2[36:0]),
                               .ctl_dp_gsr_wsr_w2(ctl_dp_gsr_wsr_w2[3:0]),
                               .ctl_dp_thr_e(ctl_dp_thr_e[3:0]),
                               // Inputs
                               .clk     (clk),
                               .se      (se),
                               .reset   (reset),
                               .opf     (opf[8:0]),
                               .tid_w2  (tid_w2[1:0]),
                               .tid_e   (tid_e[1:0]),
                               .tid     (tid[1:0]),
                               .kill_w  (kill_w),
                               .ifu_tlu_sraddr_d(ifu_tlu_sraddr_d[6:0]),
                               .exu_ffu_wsr_inst_e(exu_ffu_wsr_inst_e),
                               .exu_ffu_gsr_align_m(exu_ffu_gsr_align_m[2:0]),
                               .exu_ffu_gsr_rnd_m(exu_ffu_gsr_rnd_m[2:0]),
                               .exu_ffu_gsr_mask_m(exu_ffu_gsr_mask_m[31:0]),
                               .exu_ffu_gsr_scale_m(exu_ffu_gsr_scale_m[4:0]),
                               .dp_ctl_fsr_rnd(dp_ctl_fsr_rnd[1:0]),
                               .flush_w2(flush_w2),
                               .thr_match_mw2(thr_match_mw2),
                               .thr_match_ww2(thr_match_ww2),
                               .ifu_tlu_inst_vld_w(ifu_tlu_inst_vld_w),
                               .ue_trap_w3(ue_trap_w3),
                               .frs1_e  (frs1_e[4:0]),
                               .frs2_e  (frs2_e[4:0]),
                               .frd_e   (frd_e[4:0]),
                               .rollback_c3(rollback_c3),
                               .rollback_rs2_w2(rollback_rs2_w2),
                               .visop   (visop),
                               .rollback_rs1_w3(rollback_rs1_w3),
                               .dp_ctl_gsr_mask_e(dp_ctl_gsr_mask_e[31:0]),
                               .dp_ctl_gsr_scale_e(dp_ctl_gsr_scale_e[4:0]));
 
endmodule // sparc_ffu_ctl
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Line No.	Rev	Author	Line
1	95	fafa1971	`// ========== Copyright Header Begin ==========================================`
2			`//`
3			`// OpenSPARC T1 Processor File: sparc_ffu_ctl.v`
4			`// Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.`
5			`// DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.`
6			`//`
7			`// The above named program is free software; you can redistribute it and/or`
8			`// modify it under the terms of the GNU General Public`
9			`// License version 2 as published by the Free Software Foundation.`
10			`//`
11			`// The above named program is distributed in the hope that it will be`
12			`// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
14			`// General Public License for more details.`
15			`//`
16			`// You should have received a copy of the GNU General Public`
17			`// License along with this work; if not, write to the Free Software`
18			`// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.`
19			`//`
20			`// ========== Copyright Header End ============================================`
21			`////////////////////////////////////////////////////////////////////////`
22			`/*`
23			`// Module Name: sparc_ffu_ctl`
24			`// Description: This is the ffu control block.`
25			`*/`
26
27			`/*`
28			`/* ========== Copyright Header Begin ==========================================`
29			`*`
30			`* OpenSPARC T1 Processor File: iop.h`
31			`* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.`
32			`* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.`
33			`*`
34			`* The above named program is free software; you can redistribute it and/or`
35			`* modify it under the terms of the GNU General Public`
36			`* License version 2 as published by the Free Software Foundation.`
37			`*`
38			`* The above named program is distributed in the hope that it will be`
39			`* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of`
40			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`