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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  OR1200's CPU                                                ////

////                                                              ////

////  This file is part of the OpenRISC 1200 project              ////

////  http://www.opencores.org/cores/or1k/                        ////

////                                                              ////

////  Description                                                 ////

////  Instantiation of internal CPU blocks. IFETCH, SPRS, FRZ,    ////

////  ALU, EXCEPT, ID, WBMUX, OPERANDMUX, RF etc.                 ////

////                                                              ////

////  To Do:                                                      ////

////   - make it smaller and faster                               ////

////                                                              ////

////  Author(s):                                                  ////

////      - Damjan Lampret, lampret@opencores.org                 ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2000 Authors and OPENCORES.ORG                 ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

////                                                              ////

//// This source 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 Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

//

// CVS Revision History

//

// $Log: not supported by cvs2svn $

// Revision 1.12  2002/09/07 05:42:02  lampret

// Added optional SR[CY]. Added define to enable additional (compare) flag modifiers. Defines are OR1200_IMPL_ADDC and OR1200_ADDITIONAL_FLAG_MODIFIERS.

//

// Revision 1.11  2002/08/28 01:44:25  lampret

// Removed some commented RTL. Fixed SR/ESR flag bug.

//

// Revision 1.10  2002/07/14 22:17:17  lampret

// Added simple trace buffer [only for Xilinx Virtex target]. Fixed instruction fetch abort when new exception is recognized.

//

// Revision 1.9  2002/03/29 16:29:37  lampret

// Fixed some ports in instnatiations that were removed from the modules

//

// Revision 1.8  2002/03/29 15:16:54  lampret

// Some of the warnings fixed.

//

// Revision 1.7  2002/02/11 04:33:17  lampret

// Speed optimizations (removed duplicate _cyc_ and _stb_). Fixed D/IMMU cache-inhibit attr.

//

// Revision 1.6  2002/02/01 19:56:54  lampret

// Fixed combinational loops.

//

// Revision 1.5  2002/01/28 01:15:59  lampret

// Changed 'void' nop-ops instead of insn[0] to use insn[16]. Debug unit stalls the tick timer. Prepared new flag generation for add and and insns. Blocked DC/IC while they are turned off. Fixed I/D MMU SPRs layout except WAYs. TODO: smart IC invalidate, l.j 2 and TLB ways.

//

// Revision 1.4  2002/01/18 14:21:43  lampret

// Fixed 'the NPC single-step fix'.

//

// Revision 1.3  2002/01/18 07:56:00  lampret

// No more low/high priority interrupts (PICPR removed). Added tick timer exception. Added exception prefix (SR[EPH]). Fixed single-step bug whenreading NPC.

//

// Revision 1.2  2002/01/14 06:18:22  lampret

// Fixed mem2reg bug in FAST implementation. Updated debug unit to work with new genpc/if.

//

// Revision 1.1  2002/01/03 08:16:15  lampret

// New prefixes for RTL files, prefixed module names. Updated cache controllers and MMUs.

//

// Revision 1.19  2001/11/30 18:59:47  simons

// *** empty log message ***

//

// Revision 1.18  2001/11/23 21:42:31  simons

// Program counter divided to PPC and NPC.

//

// Revision 1.17  2001/11/23 08:38:51  lampret

// Changed DSR/DRR behavior and exception detection.

//

// Revision 1.16  2001/11/20 00:57:22  lampret

// Fixed width of du_except.

//

// Revision 1.15  2001/11/18 09:58:28  lampret

// Fixed some l.trap typos.

//

// Revision 1.14  2001/11/18 08:36:28  lampret

// For GDB changed single stepping and disabled trap exception.

//

// Revision 1.13  2001/11/13 10:02:21  lampret

// Added 'setpc'. Renamed some signals (except_flushpipe into flushpipe etc)

//

// Revision 1.12  2001/11/12 01:45:40  lampret

// Moved flag bit into SR. Changed RF enable from constant enable to dynamic enable for read ports.

//

// Revision 1.11  2001/11/10 03:43:57  lampret

// Fixed exceptions.

//

// Revision 1.10  2001/10/21 17:57:16  lampret

// Removed params from generic_XX.v. Added translate_off/on in sprs.v and id.v. Removed spr_addr from dc.v and ic.v. Fixed CR+LF.

//

// Revision 1.9  2001/10/14 13:12:09  lampret

// MP3 version.

//

// Revision 1.1.1.1  2001/10/06 10:18:35  igorm

// no message

//

// Revision 1.4  2001/08/17 08:01:19  lampret

// IC enable/disable.

//

// Revision 1.3  2001/08/13 03:36:20  lampret

// Added cfg regs. Moved all defines into one defines.v file. More cleanup.

//

// Revision 1.2  2001/08/09 13:39:33  lampret

// Major clean-up.

//

// Revision 1.1  2001/07/20 00:46:03  lampret

// Development version of RTL. Libraries are missing.

//

//

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

`include "or1200_defines.v"

module or1200_cpu(

        // Clk & Rst

        clk, rst,

        // Insn interface

        ic_en,

        icpu_adr_o, icpu_cycstb_o, icpu_sel_o, icpu_tag_o,

        icpu_dat_i, icpu_ack_i, icpu_rty_i, icpu_err_i, icpu_adr_i, icpu_tag_i,

        immu_en,

        // Debug unit

        ex_insn, ex_freeze, branch_op,

        spr_dat_npc, rf_dataw,

        du_stall, du_addr, du_dat_du, du_read, du_write, du_dsr, du_except, du_dat_cpu,

        // Data interface

        dc_en,

        dcpu_adr_o, dcpu_cycstb_o, dcpu_we_o, dcpu_sel_o, dcpu_tag_o, dcpu_dat_o,

        dcpu_dat_i, dcpu_ack_i, dcpu_rty_i, dcpu_err_i, dcpu_tag_i,

        dmmu_en,

        // Interrupt & tick exceptions

        sig_int, sig_tick,

        // SPR interface

        supv, spr_addr, spr_dat_cpu, spr_dat_pic, spr_dat_tt, spr_dat_pm,

        spr_dat_dmmu, spr_dat_immu, spr_dat_du, spr_cs, spr_we

);

parameter dw = `OR1200_OPERAND_WIDTH;

parameter aw = `OR1200_REGFILE_ADDR_WIDTH;

//

// I/O ports

//

//

// Clk & Rst

//

input                           clk;

input                           rst;

//

// Insn (IC) interface

//

output                          ic_en;

output  [31:0]                   icpu_adr_o;

output                          icpu_cycstb_o;

output  [3:0]                    icpu_sel_o;

output  [3:0]                    icpu_tag_o;

input   [31:0]                   icpu_dat_i;

input                           icpu_ack_i;

input                           icpu_rty_i;

input                           icpu_err_i;

input   [31:0]                   icpu_adr_i;

input   [3:0]                    icpu_tag_i;

//

// Insn (IMMU) interface

//

output                          immu_en;

//

// Debug interface

//

output  [31:0]                   ex_insn;

output                          ex_freeze;

output  [`OR1200_BRANCHOP_WIDTH-1:0]     branch_op;

input                           du_stall;

input   [dw-1:0]         du_addr;

input   [dw-1:0]         du_dat_du;

input                           du_read;

input                           du_write;

input   [`OR1200_DU_DSR_WIDTH-1:0]       du_dsr;

output  [12:0]                   du_except;

output  [dw-1:0]         du_dat_cpu;

output  [dw-1:0]         rf_dataw;

//

// Data (DC) interface

//

output  [31:0]                   dcpu_adr_o;

output                          dcpu_cycstb_o;

output                          dcpu_we_o;

output  [3:0]                    dcpu_sel_o;

output  [3:0]                    dcpu_tag_o;

output  [31:0]                   dcpu_dat_o;

input   [31:0]                   dcpu_dat_i;

input                           dcpu_ack_i;

input                           dcpu_rty_i;

input                           dcpu_err_i;

input   [3:0]                    dcpu_tag_i;

output                          dc_en;

//

// Data (DMMU) interface

//

output                          dmmu_en;

//

// SPR interface

//

output                          supv;

input   [dw-1:0]         spr_dat_pic;

input   [dw-1:0]         spr_dat_tt;

input   [dw-1:0]         spr_dat_pm;

input   [dw-1:0]         spr_dat_dmmu;

input   [dw-1:0]         spr_dat_immu;

input   [dw-1:0]         spr_dat_du;

output  [dw-1:0]         spr_addr;

output  [dw-1:0]         spr_dat_cpu;

output  [dw-1:0]         spr_dat_npc;

output  [31:0]                   spr_cs;

output                          spr_we;

//

// Interrupt exceptions

//

input                           sig_int;

input                           sig_tick;

//

// Internal wires

//

wire    [31:0]                   if_insn;

wire    [31:0]                   if_pc;

wire    [31:2]                  lr_sav;

wire    [aw-1:0]         rf_addrw;

wire    [aw-1:0]                 rf_addra;

wire    [aw-1:0]                 rf_addrb;

wire                            rf_rda;

wire                            rf_rdb;

wire    [dw-1:0]         simm;

wire    [dw-1:2]                branch_addrofs;

wire    [`OR1200_ALUOP_WIDTH-1:0]        alu_op;

wire    [`OR1200_SHROTOP_WIDTH-1:0]      shrot_op;

wire    [`OR1200_COMPOP_WIDTH-1:0]       comp_op;

wire    [`OR1200_BRANCHOP_WIDTH-1:0]     branch_op;

wire    [`OR1200_LSUOP_WIDTH-1:0]        lsu_op;

wire                            genpc_freeze;

wire                            if_freeze;

wire                            id_freeze;

wire                            ex_freeze;

wire                            wb_freeze;

wire    [`OR1200_SEL_WIDTH-1:0]  sel_a;

wire    [`OR1200_SEL_WIDTH-1:0]  sel_b;

wire    [`OR1200_RFWBOP_WIDTH-1:0]       rfwb_op;

wire    [dw-1:0]         rf_dataw;

wire    [dw-1:0]         rf_dataa;

wire    [dw-1:0]         rf_datab;

wire    [dw-1:0]         muxed_b;

wire    [dw-1:0]         wb_forw;

wire                            wbforw_valid;

wire    [dw-1:0]         operand_a;

wire    [dw-1:0]         operand_b;

wire    [dw-1:0]         alu_dataout;

wire    [dw-1:0]         lsu_dataout;

wire    [dw-1:0]         sprs_dataout;

wire    [31:0]                   lsu_addrofs;

wire    [`OR1200_MULTICYCLE_WIDTH-1:0]   multicycle;

wire    [`OR1200_EXCEPT_WIDTH-1:0]       except_type;

wire                            flushpipe;

wire                            extend_flush;

wire                            branch_taken;

wire                            flag;

wire                            flagforw;

wire                            flag_we;

wire                            carry;

wire                            cyforw;

wire                            cy_we;

wire                            lsu_stall;

wire                            epcr_we;

wire                            eear_we;

wire                            esr_we;

wire                            pc_we;

wire    [31:0]                   epcr;

wire    [31:0]                   eear;

wire    [`OR1200_SR_WIDTH-1:0]   esr;

wire                            sr_we;

wire    [`OR1200_SR_WIDTH-1:0]   to_sr;

wire    [`OR1200_SR_WIDTH-1:0]   sr;

wire                            except_start;

wire                            except_started;

wire    [31:0]                   wb_insn;

wire    [15:0]                   spr_addrimm;

wire                            sig_syscall;

wire                            sig_trap;

wire    [31:0]                   spr_dat_cfgr;

wire    [31:0]                   spr_dat_rf;

wire    [31:0]                  spr_dat_npc;

wire    [31:0]                   spr_dat_ppc;

wire    [31:0]                   spr_dat_mac;

wire                            force_dslot_fetch;

wire                            no_more_dslot;

wire                            ex_void;

wire                            if_stall;

wire                            id_macrc_op;

wire                            ex_macrc_op;

wire    [`OR1200_MACOP_WIDTH-1:0] mac_op;

wire    [31:0]                   mult_mac_result;

wire                            mac_stall;

wire    [12:0]                   except_stop;

wire                            genpc_refetch;

wire                            rfe;

wire                            lsu_unstall;

wire                            except_align;

wire                            except_dtlbmiss;

wire                            except_dmmufault;

wire                            except_illegal;

wire                            except_itlbmiss;

wire                            except_immufault;

wire                            except_ibuserr;

wire                            except_dbuserr;

wire                            abort_ex;

//

// Send exceptions to Debug Unit

//

assign du_except = except_stop;

//

// Data cache enable

//

assign dc_en = sr[`OR1200_SR_DCE];

//

// Instruction cache enable

//

assign ic_en = sr[`OR1200_SR_ICE];

//

// DMMU enable

//

assign dmmu_en = sr[`OR1200_SR_DME];

//

// IMMU enable

//

assign immu_en = sr[`OR1200_SR_IME];

//

// SUPV bit

//

assign supv = sr[`OR1200_SR_SM];

//

// Instantiation of instruction fetch block

//

or1200_genpc or1200_genpc(

        .clk(clk),

        .rst(rst),

        .icpu_adr_o(icpu_adr_o),

        .icpu_cycstb_o(icpu_cycstb_o),

        .icpu_sel_o(icpu_sel_o),

        .icpu_tag_o(icpu_tag_o),

        .icpu_rty_i(icpu_rty_i),

        .icpu_adr_i(icpu_adr_i),

        .branch_op(branch_op),

        .except_type(except_type),

        .except_start(except_start),

        .except_prefix(sr[`OR1200_SR_EPH]),

        .branch_addrofs(branch_addrofs),

        .lr_restor(operand_b),

        .flag(flag),

        .taken(branch_taken),

        .binsn_addr(lr_sav),

        .epcr(epcr),

        .spr_dat_i(spr_dat_cpu),

        .spr_pc_we(pc_we),

        .genpc_refetch(genpc_refetch),

        .genpc_freeze(genpc_freeze),

  .genpc_stop_prefetch(1'b0),

        .no_more_dslot(no_more_dslot)

);

//

// Instantiation of instruction fetch block

//

or1200_if or1200_if(

        .clk(clk),

        .rst(rst),

        .icpu_dat_i(icpu_dat_i),

        .icpu_ack_i(icpu_ack_i),

        .icpu_err_i(icpu_err_i),

        .icpu_adr_i(icpu_adr_i),

        .icpu_tag_i(icpu_tag_i),

        .if_freeze(if_freeze),

        .if_insn(if_insn),

        .if_pc(if_pc),

        .flushpipe(flushpipe),

        .if_stall(if_stall),

        .no_more_dslot(no_more_dslot),

        .genpc_refetch(genpc_refetch),

        .rfe(rfe),

        .except_itlbmiss(except_itlbmiss),

        .except_immufault(except_immufault),

        .except_ibuserr(except_ibuserr)

);

//

// Instantiation of instruction decode/control logic

//

or1200_ctrl or1200_ctrl(

        .clk(clk),

        .rst(rst),

        .id_freeze(id_freeze),

        .ex_freeze(ex_freeze),

        .wb_freeze(wb_freeze),

        .flushpipe(flushpipe),

        .if_insn(if_insn),

        .ex_insn(ex_insn),

        .branch_op(branch_op),

        .branch_taken(branch_taken),

        .rf_addra(rf_addra),

        .rf_addrb(rf_addrb),

        .rf_rda(rf_rda),

        .rf_rdb(rf_rdb),

        .alu_op(alu_op),

        .mac_op(mac_op),

        .shrot_op(shrot_op),

        .comp_op(comp_op),

        .rf_addrw(rf_addrw),

        .rfwb_op(rfwb_op),

        .wb_insn(wb_insn),

        .simm(simm),

        .branch_addrofs(branch_addrofs),

        .lsu_addrofs(lsu_addrofs),

        .sel_a(sel_a),

        .sel_b(sel_b),

        .lsu_op(lsu_op),

        .multicycle(multicycle),

        .spr_addrimm(spr_addrimm),

        .wbforw_valid(wbforw_valid),

        .sig_syscall(sig_syscall),

        .sig_trap(sig_trap),

        .force_dslot_fetch(force_dslot_fetch),

        .no_more_dslot(no_more_dslot),

        .ex_void(ex_void),

        .id_macrc_op(id_macrc_op),

        .ex_macrc_op(ex_macrc_op),

        .rfe(rfe),

        .except_illegal(except_illegal)

);

//

// Instantiation of register file

//

or1200_rf or1200_rf(

        .clk(clk),

        .rst(rst),

        .supv(sr[`OR1200_SR_SM]),

        .wb_freeze(wb_freeze),

        .addrw(rf_addrw),

        .dataw(rf_dataw),

        .id_freeze(id_freeze),

        .we(rfwb_op[0]),

        .flushpipe(flushpipe),

        .addra(rf_addra),

        .rda(rf_rda),

        .dataa(rf_dataa),

        .addrb(rf_addrb),

        .rdb(rf_rdb),

        .datab(rf_datab),

        .spr_cs(spr_cs[`OR1200_SPR_GROUP_SYS]),

        .spr_write(spr_we),

        .spr_addr(spr_addr),

        .spr_dat_i(spr_dat_cpu),

        .spr_dat_o(spr_dat_rf)

);

//

// Instantiation of operand muxes

//

or1200_operandmuxes or1200_operandmuxes(

        .clk(clk),

        .rst(rst),

        .id_freeze(id_freeze),

        .ex_freeze(ex_freeze),

        .rf_dataa(rf_dataa),

        .rf_datab(rf_datab),

        .ex_forw(rf_dataw),

        .wb_forw(wb_forw),

        .simm(simm),

        .sel_a(sel_a),

        .sel_b(sel_b),

        .operand_a(operand_a),

        .operand_b(operand_b),

        .muxed_b(muxed_b)

);

//

// Instantiation of CPU's ALU

//

or1200_alu or1200_alu(

        .a(operand_a),

        .b(operand_b),

        .mult_mac_result(mult_mac_result),

        .macrc_op(ex_macrc_op),

        .alu_op(alu_op),

        .shrot_op(shrot_op),

        .comp_op(comp_op),

        .result(alu_dataout),

        .flagforw(flagforw),

        .flag_we(flag_we),

        .cyforw(cyforw),

        .cy_we(cy_we),

        .carry(carry)

);

//

// Instantiation of CPU's ALU

//

or1200_mult_mac or1200_mult_mac(

        .clk(clk),

        .rst(rst),

        .ex_freeze(ex_freeze),

        .id_macrc_op(id_macrc_op),

        .macrc_op(ex_macrc_op),

        .a(operand_a),

        .b(operand_b),

        .mac_op(mac_op),

        .alu_op(alu_op),

        .result(mult_mac_result),

        .mac_stall_r(mac_stall),

        .spr_cs(spr_cs[`OR1200_SPR_GROUP_MAC]),

        .spr_write(spr_we),

        .spr_addr(spr_addr),

        .spr_dat_i(spr_dat_cpu),

        .spr_dat_o(spr_dat_mac)

);

//

// Instantiation of CPU's SPRS block

//

or1200_sprs or1200_sprs(

        .clk(clk),

        .rst(rst),

        .addrbase(operand_a),

        .addrofs(spr_addrimm),

        .dat_i(operand_b),

        .alu_op(alu_op),

        .flagforw(flagforw),

        .flag_we(flag_we),

        .flag(flag),

        .cyforw(cyforw),

        .cy_we(cy_we),

        .carry(carry),

        .to_wbmux(sprs_dataout),

        .du_addr(du_addr),

        .du_dat_du(du_dat_du),

        .du_read(du_read),

        .du_write(du_write),

        .du_dat_cpu(du_dat_cpu),

        .spr_addr(spr_addr),

        .spr_dat_pic(spr_dat_pic),

        .spr_dat_tt(spr_dat_tt),

        .spr_dat_pm(spr_dat_pm),

        .spr_dat_cfgr(spr_dat_cfgr),

        .spr_dat_rf(spr_dat_rf),

        .spr_dat_npc(spr_dat_npc),

        .spr_dat_ppc(spr_dat_ppc),

        .spr_dat_mac(spr_dat_mac),

        .spr_dat_dmmu(spr_dat_dmmu),

        .spr_dat_immu(spr_dat_immu),

        .spr_dat_du(spr_dat_du),

        .spr_dat_o(spr_dat_cpu),

        .spr_cs(spr_cs),

        .spr_we(spr_we),

        .epcr_we(epcr_we),

        .eear_we(eear_we),

        .esr_we(esr_we),

        .pc_we(pc_we),

        .epcr(epcr),

        .eear(eear),

        .esr(esr),

        .except_started(except_started),

        .sr_we(sr_we),

        .to_sr(to_sr),

        .sr(sr),

        .branch_op(branch_op)

);

//

// Instantiation of load/store unit

//

or1200_lsu or1200_lsu(

        .addrbase(operand_a),

        .addrofs(lsu_addrofs),

        .lsu_op(lsu_op),

        .lsu_datain(operand_b),

        .lsu_dataout(lsu_dataout),

        .lsu_stall(lsu_stall),

        .lsu_unstall(lsu_unstall),

        .du_stall(du_stall),

        .except_align(except_align),

        .except_dtlbmiss(except_dtlbmiss),

        .except_dmmufault(except_dmmufault),

        .except_dbuserr(except_dbuserr),

        .dcpu_adr_o(dcpu_adr_o),

        .dcpu_cycstb_o(dcpu_cycstb_o),

        .dcpu_we_o(dcpu_we_o),

        .dcpu_sel_o(dcpu_sel_o),

        .dcpu_tag_o(dcpu_tag_o),

        .dcpu_dat_o(dcpu_dat_o),

        .dcpu_dat_i(dcpu_dat_i),

        .dcpu_ack_i(dcpu_ack_i),

        .dcpu_rty_i(dcpu_rty_i),

        .dcpu_err_i(dcpu_err_i),

        .dcpu_tag_i(dcpu_tag_i)

);

//

// Instantiation of write-back muxes

//

or1200_wbmux or1200_wbmux(

        .clk(clk),

        .rst(rst),

        .wb_freeze(wb_freeze),

        .rfwb_op(rfwb_op),

        .muxin_a(alu_dataout),

        .muxin_b(lsu_dataout),

        .muxin_c(sprs_dataout),

        .muxin_d({lr_sav, 2'b0}),

        .muxout(rf_dataw),

        .muxreg(wb_forw),

        .muxreg_valid(wbforw_valid)

);

//

// Instantiation of freeze logic

//

or1200_freeze or1200_freeze(

        .clk(clk),

        .rst(rst),