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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  OR1200's Debug Unit                                         ////
////                                                              ////
////  This file is part of the OpenRISC 1200 project              ////
////  http://www.opencores.org/project,or1k                       ////
////                                                              ////
////  Description                                                 ////
////  Basic OR1200 debug unit.                                    ////
////                                                              ////
////  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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
//
// $Log: or1200_du.v,v $
// Revision 2.0  2010/06/30 11:00:00  ORSoC
// Minor update: 
// Bugs fixed. 
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "or1200_defines.v"
 
//
// Debug unit
//
 
module or1200_du(
        // RISC Internal Interface
        clk, rst,
        dcpu_cycstb_i, dcpu_we_i, dcpu_adr_i, dcpu_dat_lsu,
        dcpu_dat_dc, icpu_cycstb_i,
        ex_freeze, branch_op, ex_insn, id_pc,
        spr_dat_npc, rf_dataw,
        du_dsr, du_dmr1, du_stall, du_addr, du_dat_i, du_dat_o,
        du_read, du_write, du_except_stop, du_hwbkpt,
        spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o,
 
        // External Debug Interface
        dbg_stall_i, dbg_ewt_i, dbg_lss_o, dbg_is_o, dbg_wp_o, dbg_bp_o,
        dbg_stb_i, dbg_we_i, dbg_adr_i, dbg_dat_i, dbg_dat_o, dbg_ack_o
);
 
parameter dw = `OR1200_OPERAND_WIDTH;
parameter aw = `OR1200_OPERAND_WIDTH;
 
//
// I/O
//
 
//
// RISC Internal Interface
//
input                           clk;            // Clock
input                           rst;            // Reset
input                           dcpu_cycstb_i;  // LSU status
input                           dcpu_we_i;      // LSU status
input   [31:0]                   dcpu_adr_i;     // LSU addr
input   [31:0]                   dcpu_dat_lsu;   // LSU store data
input   [31:0]                   dcpu_dat_dc;    // LSU load data
input   [`OR1200_FETCHOP_WIDTH-1:0]      icpu_cycstb_i;  // IFETCH unit status
input                           ex_freeze;      // EX stage freeze
input   [`OR1200_BRANCHOP_WIDTH-1:0]     branch_op;      // Branch op
input   [dw-1:0]         ex_insn;        // EX insn
input   [31:0]                   id_pc;          // insn fetch EA
input   [31:0]                   spr_dat_npc;    // Next PC (for trace)
input   [31:0]                   rf_dataw;       // ALU result (for trace)
output  [`OR1200_DU_DSR_WIDTH-1:0]     du_dsr;           // DSR
output  [24: 0]                  du_dmr1;
output                          du_stall;       // Debug Unit Stall
output  [aw-1:0]         du_addr;        // Debug Unit Address
input   [dw-1:0]         du_dat_i;       // Debug Unit Data In
output  [dw-1:0]         du_dat_o;       // Debug Unit Data Out
output                          du_read;        // Debug Unit Read Enable
output                          du_write;       // Debug Unit Write Enable
input   [13:0]                   du_except_stop; // Exception masked by DSR
output                          du_hwbkpt;      // Cause trap exception (HW Breakpoints)
input                           spr_cs;         // SPR Chip Select
input                           spr_write;      // SPR Read/Write
input   [aw-1:0]         spr_addr;       // SPR Address
input   [dw-1:0]         spr_dat_i;      // SPR Data Input
output  [dw-1:0]         spr_dat_o;      // SPR Data Output
 
//
// External Debug Interface
//
input                   dbg_stall_i;    // External Stall Input
input                   dbg_ewt_i;      // External Watchpoint Trigger Input
output  [3:0]            dbg_lss_o;      // External Load/Store Unit Status
output  [1:0]            dbg_is_o;       // External Insn Fetch Status
output  [10:0]           dbg_wp_o;       // Watchpoints Outputs
output                  dbg_bp_o;       // Breakpoint Output
input                   dbg_stb_i;      // External Address/Data Strobe
input                   dbg_we_i;       // External Write Enable
input   [aw-1:0] dbg_adr_i;      // External Address Input
input   [dw-1:0] dbg_dat_i;      // External Data Input
output  [dw-1:0] dbg_dat_o;      // External Data Output
output                  dbg_ack_o;      // External Data Acknowledge (not WB compatible)
reg     [dw-1:0] dbg_dat_o;      // External Data Output
reg                     dbg_ack_o;      // External Data Acknowledge (not WB compatible)
 
 
//
// Some connections go directly from the CPU through DU to Debug I/F
//
`ifdef OR1200_DU_STATUS_UNIMPLEMENTED
assign dbg_lss_o = 4'b0000;
 
reg     [1:0]                    dbg_is_o;
//
// Show insn activity (temp, must be removed)
//
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dbg_is_o <=  2'b00;
        else if (!ex_freeze & ~((ex_insn[31:26] == `OR1200_OR32_NOP) & ex_insn[16]))
                dbg_is_o <=  ~dbg_is_o;
`ifdef UNUSED
assign dbg_is_o = 2'b00;
`endif
`else
assign dbg_lss_o = dcpu_cycstb_i ? {dcpu_we_i, 3'b000} : 4'b0000;
assign dbg_is_o = {1'b0, icpu_cycstb_i};
`endif
assign dbg_wp_o = 11'b000_0000_0000;
 
//
// Some connections go directly from Debug I/F through DU to the CPU
//
assign du_stall = dbg_stall_i;
assign du_addr = dbg_adr_i;
assign du_dat_o = dbg_dat_i;
assign du_read = dbg_stb_i && !dbg_we_i;
assign du_write = dbg_stb_i && dbg_we_i;
 
reg                             dbg_ack;
//
// Generate acknowledge -- just delay stb signal
//
always @(posedge clk or `OR1200_RST_EVENT rst) begin
        if (rst == `OR1200_RST_VALUE) begin
                dbg_ack   <=  1'b0;
                dbg_ack_o <=  1'b0;
        end
        else begin
                dbg_ack   <=  dbg_stb_i;                // valid when du_dat_i 
                dbg_ack_o <=  dbg_ack & dbg_stb_i;      // valid when dbg_dat_o 
        end
end
 
// 
// Register data output
//
always @(posedge clk)
    dbg_dat_o <=  du_dat_i;
 
`ifdef OR1200_DU_IMPLEMENTED
 
//
// Debug Mode Register 1
//
`ifdef OR1200_DU_DMR1
reg     [24:0]                   dmr1;           // DMR1 implemented
`else
wire    [24:0]                   dmr1;           // DMR1 not implemented
`endif
assign du_dmr1 = dmr1;
 
//
// Debug Mode Register 2
//
`ifdef OR1200_DU_DMR2
reg     [23:0]                   dmr2;           // DMR2 implemented
`else
wire    [23:0]                   dmr2;           // DMR2 not implemented
`endif
 
//
// Debug Stop Register
//
`ifdef OR1200_DU_DSR
reg     [`OR1200_DU_DSR_WIDTH-1:0]       dsr;            // DSR implemented
`else
wire    [`OR1200_DU_DSR_WIDTH-1:0]       dsr;            // DSR not implemented
`endif
 
//
// Debug Reason Register
//
`ifdef OR1200_DU_DRR
reg     [13:0]                   drr;            // DRR implemented
`else
wire    [13:0]                   drr;            // DRR not implemented
`endif
 
//
// Debug Value Register N
//
`ifdef OR1200_DU_DVR0
reg     [31:0]                   dvr0;
`else
wire    [31:0]                   dvr0;
`endif
 
//
// Debug Value Register N
//
`ifdef OR1200_DU_DVR1
reg     [31:0]                   dvr1;
`else
wire    [31:0]                   dvr1;
`endif
 
//
// Debug Value Register N
//
`ifdef OR1200_DU_DVR2
reg     [31:0]                   dvr2;
`else
wire    [31:0]                   dvr2;
`endif
 
//
// Debug Value Register N
//
`ifdef OR1200_DU_DVR3
reg     [31:0]                   dvr3;
`else
wire    [31:0]                   dvr3;
`endif
 
//
// Debug Value Register N
//
`ifdef OR1200_DU_DVR4
reg     [31:0]                   dvr4;
`else
wire    [31:0]                   dvr4;
`endif
 
//
// Debug Value Register N
//
`ifdef OR1200_DU_DVR5
reg     [31:0]                   dvr5;
`else
wire    [31:0]                   dvr5;
`endif
 
//
// Debug Value Register N
//
`ifdef OR1200_DU_DVR6
reg     [31:0]                   dvr6;
`else
wire    [31:0]                   dvr6;
`endif
 
//
// Debug Value Register N
//
`ifdef OR1200_DU_DVR7
reg     [31:0]                   dvr7;
`else
wire    [31:0]                   dvr7;
`endif
 
//
// Debug Control Register N
//
`ifdef OR1200_DU_DCR0
reg     [7:0]                    dcr0;
`else
wire    [7:0]                    dcr0;
`endif
 
//
// Debug Control Register N
//
`ifdef OR1200_DU_DCR1
reg     [7:0]                    dcr1;
`else
wire    [7:0]                    dcr1;
`endif
 
//
// Debug Control Register N
//
`ifdef OR1200_DU_DCR2
reg     [7:0]                    dcr2;
`else
wire    [7:0]                    dcr2;
`endif
 
//
// Debug Control Register N
//
`ifdef OR1200_DU_DCR3
reg     [7:0]                    dcr3;
`else
wire    [7:0]                    dcr3;
`endif
 
//
// Debug Control Register N
//
`ifdef OR1200_DU_DCR4
reg     [7:0]                    dcr4;
`else
wire    [7:0]                    dcr4;
`endif
 
//
// Debug Control Register N
//
`ifdef OR1200_DU_DCR5
reg     [7:0]                    dcr5;
`else
wire    [7:0]                    dcr5;
`endif
 
//
// Debug Control Register N
//
`ifdef OR1200_DU_DCR6
reg     [7:0]                    dcr6;
`else
wire    [7:0]                    dcr6;
`endif
 
//
// Debug Control Register N
//
`ifdef OR1200_DU_DCR7
reg     [7:0]                    dcr7;
`else
wire    [7:0]                    dcr7;
`endif
 
//
// Debug Watchpoint Counter Register 0
//
`ifdef OR1200_DU_DWCR0
reg     [31:0]                   dwcr0;
`else
wire    [31:0]                   dwcr0;
`endif
 
//
// Debug Watchpoint Counter Register 1
//
`ifdef OR1200_DU_DWCR1
reg     [31:0]                   dwcr1;
`else
wire    [31:0]                   dwcr1;
`endif
 
//
// Internal wires
//
wire                            dmr1_sel;       // DMR1 select
wire                            dmr2_sel;       // DMR2 select
wire                            dsr_sel;        // DSR select
wire                            drr_sel;        // DRR select
wire                            dvr0_sel,
                                dvr1_sel,
                                dvr2_sel,
                                dvr3_sel,
                                dvr4_sel,
                                dvr5_sel,
                                dvr6_sel,
                                dvr7_sel;       // DVR selects
wire                            dcr0_sel,
                                dcr1_sel,
                                dcr2_sel,
                                dcr3_sel,
                                dcr4_sel,
                                dcr5_sel,
                                dcr6_sel,
                                dcr7_sel;       // DCR selects
wire                            dwcr0_sel,
                                dwcr1_sel;      // DWCR selects
reg                             dbg_bp_r;
reg                             ex_freeze_q;
`ifdef OR1200_DU_HWBKPTS
reg     [31:0]                   match_cond0_ct;
reg     [31:0]                   match_cond1_ct;
reg     [31:0]                   match_cond2_ct;
reg     [31:0]                   match_cond3_ct;
reg     [31:0]                   match_cond4_ct;
reg     [31:0]                   match_cond5_ct;
reg     [31:0]                   match_cond6_ct;
reg     [31:0]                   match_cond7_ct;
reg                             match_cond0_stb;
reg                             match_cond1_stb;
reg                             match_cond2_stb;
reg                             match_cond3_stb;
reg                             match_cond4_stb;
reg                             match_cond5_stb;
reg                             match_cond6_stb;
reg                             match_cond7_stb;
reg                             match0;
reg                             match1;
reg                             match2;
reg                             match3;
reg                             match4;
reg                             match5;
reg                             match6;
reg                             match7;
reg                             wpcntr0_match;
reg                             wpcntr1_match;
reg                             incr_wpcntr0;
reg                             incr_wpcntr1;
reg     [10:0]                   wp;
`endif
wire                            du_hwbkpt;
reg                             du_hwbkpt_hold;
`ifdef OR1200_DU_READREGS
reg     [31:0]                   spr_dat_o;
`endif
reg     [13:0]                   except_stop;    // Exceptions that stop because of DSR
`ifdef OR1200_DU_TB_IMPLEMENTED
wire                            tb_enw;
reg     [7:0]                    tb_wadr;
reg [31:0]                       tb_timstmp;
`endif
wire    [31:0]                   tbia_dat_o;
wire    [31:0]                   tbim_dat_o;
wire    [31:0]                   tbar_dat_o;
wire    [31:0]                   tbts_dat_o;
 
//
// DU registers address decoder
//
`ifdef OR1200_DU_DMR1
assign dmr1_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DMR1));
`endif
`ifdef OR1200_DU_DMR2
assign dmr2_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DMR2));
`endif
`ifdef OR1200_DU_DSR
assign dsr_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DSR));
`endif
`ifdef OR1200_DU_DRR
assign drr_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DRR));
`endif
`ifdef OR1200_DU_DVR0
assign dvr0_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR0));
`endif
`ifdef OR1200_DU_DVR1
assign dvr1_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR1));
`endif
`ifdef OR1200_DU_DVR2
assign dvr2_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR2));
`endif
`ifdef OR1200_DU_DVR3
assign dvr3_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR3));
`endif
`ifdef OR1200_DU_DVR4
assign dvr4_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR4));
`endif
`ifdef OR1200_DU_DVR5
assign dvr5_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR5));
`endif
`ifdef OR1200_DU_DVR6
assign dvr6_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR6));
`endif
`ifdef OR1200_DU_DVR7
assign dvr7_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR7));
`endif
`ifdef OR1200_DU_DCR0
assign dcr0_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DCR0));
`endif
`ifdef OR1200_DU_DCR1
assign dcr1_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DCR1));
`endif
`ifdef OR1200_DU_DCR2
assign dcr2_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DCR2));
`endif
`ifdef OR1200_DU_DCR3
assign dcr3_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DCR3));
`endif
`ifdef OR1200_DU_DCR4
assign dcr4_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DCR4));
`endif
`ifdef OR1200_DU_DCR5
assign dcr5_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DCR5));
`endif
`ifdef OR1200_DU_DCR6
assign dcr6_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DCR6));
`endif
`ifdef OR1200_DU_DCR7
assign dcr7_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DCR7));
`endif
`ifdef OR1200_DU_DWCR0
assign dwcr0_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DWCR0));
`endif
`ifdef OR1200_DU_DWCR1
assign dwcr1_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DWCR1));
`endif
 
// Track previous ex_freeze to detect when signals are updated
always @(posedge clk)
  ex_freeze_q <= ex_freeze;
 
//
// Decode started exception
//
// du_except_stop comes from or1200_except
//   
always @(du_except_stop or ex_freeze_q) begin
        except_stop = 14'b00_0000_0000_0000;
        casez (du_except_stop)
                14'b1?_????_????_????:
                        except_stop[`OR1200_DU_DRR_TTE] = 1'b1;
                14'b01_????_????_????: begin
                        except_stop[`OR1200_DU_DRR_IE] = 1'b1;
                end
                14'b00_1???_????_????: begin
                        except_stop[`OR1200_DU_DRR_IME] = 1'b1;
                end
                14'b00_01??_????_????:
                        except_stop[`OR1200_DU_DRR_IPFE] = 1'b1;
                14'b00_001?_????_????: begin
                        except_stop[`OR1200_DU_DRR_BUSEE] = 1'b1;
                end
                14'b00_0001_????_????:
                        except_stop[`OR1200_DU_DRR_IIE] = 1'b1;
                14'b00_0000_1???_????: begin
                        except_stop[`OR1200_DU_DRR_AE] = 1'b1;
                end
                14'b00_0000_01??_????: begin
                        except_stop[`OR1200_DU_DRR_DME] = 1'b1;
                end
                14'b00_0000_001?_????:
                        except_stop[`OR1200_DU_DRR_DPFE] = 1'b1;
                14'b00_0000_0001_????:
                        except_stop[`OR1200_DU_DRR_BUSEE] = 1'b1;
                14'b00_0000_0000_1???: begin
                        except_stop[`OR1200_DU_DRR_RE] = 1'b1;
                end
                14'b00_0000_0000_01??: begin
                        except_stop[`OR1200_DU_DRR_TE] = 1'b1 & ~ex_freeze_q;
                end
                14'b00_0000_0000_001?: begin
                        except_stop[`OR1200_DU_DRR_FPE] = 1'b1;
                end
                14'b00_0000_0000_0001:
                        except_stop[`OR1200_DU_DRR_SCE] = 1'b1 & ~ex_freeze_q;
                default:
                        except_stop = 14'b00_0000_0000_0000;
        endcase // casez (du_except_stop)
end
 
//
// dbg_bp_o is registered
//
assign dbg_bp_o = dbg_bp_r;
 
//
// Breakpoint activation register
//
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dbg_bp_r <=  1'b0;
        else if (!ex_freeze)
                dbg_bp_r <=  |except_stop
`ifdef OR1200_DU_DMR1_ST
                        | ~((ex_insn[31:26] == `OR1200_OR32_NOP) & ex_insn[16]) & dmr1[`OR1200_DU_DMR1_ST]
`endif
`ifdef OR1200_DU_DMR1_BT
                        | (branch_op != `OR1200_BRANCHOP_NOP) & (branch_op != `OR1200_BRANCHOP_RFE) & dmr1[`OR1200_DU_DMR1_BT]
`endif
                        ;
        else
                dbg_bp_r <=  |except_stop;
 
//
// Write to DMR1
//
`ifdef OR1200_DU_DMR1
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dmr1 <= 25'h000_0000;
        else if (dmr1_sel && spr_write)
`ifdef OR1200_DU_HWBKPTS
                dmr1 <=  spr_dat_i[24:0];
`else
                dmr1 <=  {1'b0, spr_dat_i[23:22], 22'h00_0000};
`endif
`else
assign dmr1 = 25'h000_0000;
`endif
 
//
// Write to DMR2
//
`ifdef OR1200_DU_DMR2
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dmr2 <= 24'h00_0000;
        else if (dmr2_sel && spr_write)
                dmr2 <=  spr_dat_i[23:0];
`else
assign dmr2 = 24'h00_0000;
`endif
 
//
// Write to DSR
//
`ifdef OR1200_DU_DSR
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dsr <= {`OR1200_DU_DSR_WIDTH{1'b0}};
        else if (dsr_sel && spr_write)
                dsr <=  spr_dat_i[`OR1200_DU_DSR_WIDTH-1:0];
`else
assign dsr = {`OR1200_DU_DSR_WIDTH{1'b0}};
`endif
 
//
// Write to DRR
//
`ifdef OR1200_DU_DRR
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                drr <= 14'b0;
        else if (drr_sel && spr_write)
                drr <=  spr_dat_i[13:0];
        else
                drr <=  drr | except_stop;
`else
assign drr = 14'b0;
`endif
 
//
// Write to DVR0
//
`ifdef OR1200_DU_DVR0
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dvr0 <= 32'h0000_0000;
        else if (dvr0_sel && spr_write)
                dvr0 <=  spr_dat_i[31:0];
`else
assign dvr0 = 32'h0000_0000;
`endif
 
//
// Write to DVR1
//
`ifdef OR1200_DU_DVR1
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dvr1 <= 32'h0000_0000;
        else if (dvr1_sel && spr_write)
                dvr1 <=  spr_dat_i[31:0];
`else
assign dvr1 = 32'h0000_0000;
`endif
 
//
// Write to DVR2
//
`ifdef OR1200_DU_DVR2
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dvr2 <= 32'h0000_0000;
        else if (dvr2_sel && spr_write)
                dvr2 <=  spr_dat_i[31:0];
`else
assign dvr2 = 32'h0000_0000;
`endif
 
//
// Write to DVR3
//
`ifdef OR1200_DU_DVR3
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dvr3 <= 32'h0000_0000;
        else if (dvr3_sel && spr_write)
                dvr3 <=  spr_dat_i[31:0];
`else
assign dvr3 = 32'h0000_0000;
`endif
 
//
// Write to DVR4
//
`ifdef OR1200_DU_DVR4
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dvr4 <= 32'h0000_0000;
        else if (dvr4_sel && spr_write)
                dvr4 <=  spr_dat_i[31:0];
`else
assign dvr4 = 32'h0000_0000;
`endif
 
//
// Write to DVR5
//
`ifdef OR1200_DU_DVR5
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dvr5 <= 32'h0000_0000;
        else if (dvr5_sel && spr_write)
                dvr5 <=  spr_dat_i[31:0];
`else
assign dvr5 = 32'h0000_0000;
`endif
 
//
// Write to DVR6
//
`ifdef OR1200_DU_DVR6
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dvr6 <= 32'h0000_0000;
        else if (dvr6_sel && spr_write)
                dvr6 <=  spr_dat_i[31:0];
`else
assign dvr6 = 32'h0000_0000;
`endif
 
//
// Write to DVR7
//
`ifdef OR1200_DU_DVR7
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dvr7 <= 32'h0000_0000;
        else if (dvr7_sel && spr_write)
                dvr7 <=  spr_dat_i[31:0];
`else
assign dvr7 = 32'h0000_0000;
`endif
 
//
// Write to DCR0
//
`ifdef OR1200_DU_DCR0
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dcr0 <= 8'h00;
        else if (dcr0_sel && spr_write)
                dcr0 <=  spr_dat_i[7:0];
`else
assign dcr0 = 8'h00;
`endif
 
//
// Write to DCR1
//
`ifdef OR1200_DU_DCR1
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dcr1 <= 8'h00;
        else if (dcr1_sel && spr_write)
                dcr1 <=  spr_dat_i[7:0];
`else
assign dcr1 = 8'h00;
`endif
 
//
// Write to DCR2
//
`ifdef OR1200_DU_DCR2
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dcr2 <= 8'h00;
        else if (dcr2_sel && spr_write)
                dcr2 <=  spr_dat_i[7:0];
`else
assign dcr2 = 8'h00;
`endif
 
//
// Write to DCR3
//
`ifdef OR1200_DU_DCR3
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dcr3 <= 8'h00;
        else if (dcr3_sel && spr_write)
                dcr3 <=  spr_dat_i[7:0];
`else
assign dcr3 = 8'h00;
`endif
 
//
// Write to DCR4
//
`ifdef OR1200_DU_DCR4
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dcr4 <= 8'h00;
        else if (dcr4_sel && spr_write)
                dcr4 <=  spr_dat_i[7:0];
`else
assign dcr4 = 8'h00;
`endif
 
//
// Write to DCR5
//
`ifdef OR1200_DU_DCR5
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dcr5 <= 8'h00;
        else if (dcr5_sel && spr_write)
                dcr5 <=  spr_dat_i[7:0];
`else
assign dcr5 = 8'h00;
`endif
 
//
// Write to DCR6
//
`ifdef OR1200_DU_DCR6
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dcr6 <= 8'h00;
        else if (dcr6_sel && spr_write)
                dcr6 <=  spr_dat_i[7:0];
`else
assign dcr6 = 8'h00;
`endif
 
//
// Write to DCR7
//
`ifdef OR1200_DU_DCR7
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dcr7 <= 8'h00;
        else if (dcr7_sel && spr_write)
                dcr7 <=  spr_dat_i[7:0];
`else
assign dcr7 = 8'h00;
`endif
 
//
// Write to DWCR0
//
`ifdef OR1200_DU_DWCR0
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dwcr0 <= 32'h0000_0000;
        else if (dwcr0_sel && spr_write)
                dwcr0 <=  spr_dat_i[31:0];
        else if (incr_wpcntr0)
                dwcr0[`OR1200_DU_DWCR_COUNT] <=  dwcr0[`OR1200_DU_DWCR_COUNT] + 16'h0001;
`else
assign dwcr0 = 32'h0000_0000;
`endif
 
//
// Write to DWCR1
//
`ifdef OR1200_DU_DWCR1
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                dwcr1 <= 32'h0000_0000;
        else if (dwcr1_sel && spr_write)
                dwcr1 <=  spr_dat_i[31:0];
        else if (incr_wpcntr1)
                dwcr1[`OR1200_DU_DWCR_COUNT] <=  dwcr1[`OR1200_DU_DWCR_COUNT] + 16'h0001;
`else
assign dwcr1 = 32'h0000_0000;
`endif
 
//
// Read DU registers
//
`ifdef OR1200_DU_READREGS
always @(spr_addr or dsr or drr or dmr1 or dmr2
        or dvr0 or dvr1 or dvr2 or dvr3 or dvr4
        or dvr5 or dvr6 or dvr7
        or dcr0 or dcr1 or dcr2 or dcr3 or dcr4
        or dcr5 or dcr6 or dcr7
        or dwcr0 or dwcr1
`ifdef OR1200_DU_TB_IMPLEMENTED
        or tb_wadr or tbia_dat_o or tbim_dat_o
        or tbar_dat_o or tbts_dat_o
`endif
        )
        casez (spr_addr[`OR1200_DUOFS_BITS]) // synopsys parallel_case
`ifdef OR1200_DU_DVR0
                `OR1200_DU_DVR0:
                        spr_dat_o = dvr0;
`endif
`ifdef OR1200_DU_DVR1
                `OR1200_DU_DVR1:
                        spr_dat_o = dvr1;
`endif
`ifdef OR1200_DU_DVR2
                `OR1200_DU_DVR2:
                        spr_dat_o = dvr2;
`endif
`ifdef OR1200_DU_DVR3
                `OR1200_DU_DVR3:
                        spr_dat_o = dvr3;
`endif
`ifdef OR1200_DU_DVR4
                `OR1200_DU_DVR4:
                        spr_dat_o = dvr4;
`endif
`ifdef OR1200_DU_DVR5
                `OR1200_DU_DVR5:
                        spr_dat_o = dvr5;
`endif
`ifdef OR1200_DU_DVR6
                `OR1200_DU_DVR6:
                        spr_dat_o = dvr6;
`endif
`ifdef OR1200_DU_DVR7
                `OR1200_DU_DVR7:
                        spr_dat_o = dvr7;
`endif
`ifdef OR1200_DU_DCR0
                `OR1200_DU_DCR0:
                        spr_dat_o = {24'h00_0000, dcr0};
`endif
`ifdef OR1200_DU_DCR1
                `OR1200_DU_DCR1:
                        spr_dat_o = {24'h00_0000, dcr1};
`endif
`ifdef OR1200_DU_DCR2
                `OR1200_DU_DCR2:
                        spr_dat_o = {24'h00_0000, dcr2};
`endif
`ifdef OR1200_DU_DCR3
                `OR1200_DU_DCR3:
                        spr_dat_o = {24'h00_0000, dcr3};
`endif
`ifdef OR1200_DU_DCR4
                `OR1200_DU_DCR4:
                        spr_dat_o = {24'h00_0000, dcr4};
`endif
`ifdef OR1200_DU_DCR5
                `OR1200_DU_DCR5:
                        spr_dat_o = {24'h00_0000, dcr5};
`endif
`ifdef OR1200_DU_DCR6
                `OR1200_DU_DCR6:
                        spr_dat_o = {24'h00_0000, dcr6};
`endif
`ifdef OR1200_DU_DCR7
                `OR1200_DU_DCR7:
                        spr_dat_o = {24'h00_0000, dcr7};
`endif
`ifdef OR1200_DU_DMR1
                `OR1200_DU_DMR1:
                        spr_dat_o = {7'h00, dmr1};
`endif
`ifdef OR1200_DU_DMR2
                `OR1200_DU_DMR2:
                        spr_dat_o = {8'h00, dmr2};
`endif
`ifdef OR1200_DU_DWCR0
                `OR1200_DU_DWCR0:
                        spr_dat_o = dwcr0;
`endif
`ifdef OR1200_DU_DWCR1
                `OR1200_DU_DWCR1:
                        spr_dat_o = dwcr1;
`endif
`ifdef OR1200_DU_DSR
                `OR1200_DU_DSR:
                        spr_dat_o = {18'b0, dsr};
`endif
`ifdef OR1200_DU_DRR
                `OR1200_DU_DRR:
                        spr_dat_o = {18'b0, drr};
`endif
`ifdef OR1200_DU_TB_IMPLEMENTED
                `OR1200_DU_TBADR:
                        spr_dat_o = {24'h000000, tb_wadr};
                `OR1200_DU_TBIA:
                        spr_dat_o = tbia_dat_o;
                `OR1200_DU_TBIM:
                        spr_dat_o = tbim_dat_o;
                `OR1200_DU_TBAR:
                        spr_dat_o = tbar_dat_o;
                `OR1200_DU_TBTS:
                        spr_dat_o = tbts_dat_o;
`endif
                default:
                        spr_dat_o = 32'h0000_0000;
        endcase
`endif
 
//
// DSR alias
//
assign du_dsr = dsr;
 
`ifdef OR1200_DU_HWBKPTS
 
//
// Compare To What (Match Condition 0)
//
always @(dcr0 or id_pc or dcpu_adr_i or dcpu_dat_dc
        or dcpu_dat_lsu or dcpu_we_i)
        case (dcr0[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b001: match_cond0_ct = id_pc;         // insn fetch EA
                3'b010: match_cond0_ct = dcpu_adr_i;    // load EA
                3'b011: match_cond0_ct = dcpu_adr_i;    // store EA
                3'b100: match_cond0_ct = dcpu_dat_dc;   // load data
                3'b101: match_cond0_ct = dcpu_dat_lsu;  // store data
                3'b110: match_cond0_ct = dcpu_adr_i;    // load/store EA
                default:match_cond0_ct = dcpu_we_i ? dcpu_dat_lsu : dcpu_dat_dc;
        endcase
 
//
// When To Compare (Match Condition 0)
//
always @(dcr0 or dcpu_cycstb_i)
        case (dcr0[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b000: match_cond0_stb = 1'b0;         //comparison disabled
                3'b001: match_cond0_stb = 1'b1;         // insn fetch EA
                default:match_cond0_stb = dcpu_cycstb_i; // any load/store
        endcase
 
//
// Match Condition 0
//
always @(match_cond0_stb or dcr0 or dvr0 or match_cond0_ct)
        casex ({match_cond0_stb, dcr0[`OR1200_DU_DCR_CC]})
                4'b0_xxx,
                4'b1_000,
                4'b1_111: match0 = 1'b0;
                4'b1_001: match0 =
                        ({(match_cond0_ct[31] ^ dcr0[`OR1200_DU_DCR_SC]), match_cond0_ct[30:0]} ==
                         {(dvr0[31] ^ dcr0[`OR1200_DU_DCR_SC]), dvr0[30:0]});
                4'b1_010: match0 =
                        ({(match_cond0_ct[31] ^ dcr0[`OR1200_DU_DCR_SC]), match_cond0_ct[30:0]} <
                         {(dvr0[31] ^ dcr0[`OR1200_DU_DCR_SC]), dvr0[30:0]});
                4'b1_011: match0 =
                        ({(match_cond0_ct[31] ^ dcr0[`OR1200_DU_DCR_SC]), match_cond0_ct[30:0]} <=
                         {(dvr0[31] ^ dcr0[`OR1200_DU_DCR_SC]), dvr0[30:0]});
                4'b1_100: match0 =
                        ({(match_cond0_ct[31] ^ dcr0[`OR1200_DU_DCR_SC]), match_cond0_ct[30:0]} >
                         {(dvr0[31] ^ dcr0[`OR1200_DU_DCR_SC]), dvr0[30:0]});
                4'b1_101: match0 =
                        ({(match_cond0_ct[31] ^ dcr0[`OR1200_DU_DCR_SC]), match_cond0_ct[30:0]} >=
                         {(dvr0[31] ^ dcr0[`OR1200_DU_DCR_SC]), dvr0[30:0]});
                4'b1_110: match0 =
                        ({(match_cond0_ct[31] ^ dcr0[`OR1200_DU_DCR_SC]), match_cond0_ct[30:0]} !=
                         {(dvr0[31] ^ dcr0[`OR1200_DU_DCR_SC]), dvr0[30:0]});
        endcase
 
//
// Watchpoint 0
//
always @(dmr1 or match0)
        case (dmr1[`OR1200_DU_DMR1_CW0])
                2'b00: wp[0] = match0;
                2'b01: wp[0] = match0;
                2'b10: wp[0] = match0;
                2'b11: wp[0] = 1'b0;
        endcase
 
//
// Compare To What (Match Condition 1)
//
always @(dcr1 or id_pc or dcpu_adr_i or dcpu_dat_dc
        or dcpu_dat_lsu or dcpu_we_i)
        case (dcr1[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b001: match_cond1_ct = id_pc;         // insn fetch EA
                3'b010: match_cond1_ct = dcpu_adr_i;    // load EA
                3'b011: match_cond1_ct = dcpu_adr_i;    // store EA
                3'b100: match_cond1_ct = dcpu_dat_dc;   // load data
                3'b101: match_cond1_ct = dcpu_dat_lsu;  // store data
                3'b110: match_cond1_ct = dcpu_adr_i;    // load/store EA
                default:match_cond1_ct = dcpu_we_i ? dcpu_dat_lsu : dcpu_dat_dc;
        endcase
 
//
// When To Compare (Match Condition 1)
//
always @(dcr1 or dcpu_cycstb_i)
        case (dcr1[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b000: match_cond1_stb = 1'b0;         //comparison disabled
                3'b001: match_cond1_stb = 1'b1;         // insn fetch EA
                default:match_cond1_stb = dcpu_cycstb_i; // any load/store
        endcase
 
//
// Match Condition 1
//
always @(match_cond1_stb or dcr1 or dvr1 or match_cond1_ct)
        casex ({match_cond1_stb, dcr1[`OR1200_DU_DCR_CC]})
                4'b0_xxx,
                4'b1_000,
                4'b1_111: match1 = 1'b0;
                4'b1_001: match1 =
                        ({(match_cond1_ct[31] ^ dcr1[`OR1200_DU_DCR_SC]), match_cond1_ct[30:0]} ==
                         {(dvr1[31] ^ dcr1[`OR1200_DU_DCR_SC]), dvr1[30:0]});
                4'b1_010: match1 =
                        ({(match_cond1_ct[31] ^ dcr1[`OR1200_DU_DCR_SC]), match_cond1_ct[30:0]} <
                         {(dvr1[31] ^ dcr1[`OR1200_DU_DCR_SC]), dvr1[30:0]});
                4'b1_011: match1 =
                        ({(match_cond1_ct[31] ^ dcr1[`OR1200_DU_DCR_SC]), match_cond1_ct[30:0]} <=
                         {(dvr1[31] ^ dcr1[`OR1200_DU_DCR_SC]), dvr1[30:0]});
                4'b1_100: match1 =
                        ({(match_cond1_ct[31] ^ dcr1[`OR1200_DU_DCR_SC]), match_cond1_ct[30:0]} >
                         {(dvr1[31] ^ dcr1[`OR1200_DU_DCR_SC]), dvr1[30:0]});
                4'b1_101: match1 =
                        ({(match_cond1_ct[31] ^ dcr1[`OR1200_DU_DCR_SC]), match_cond1_ct[30:0]} >=
                         {(dvr1[31] ^ dcr1[`OR1200_DU_DCR_SC]), dvr1[30:0]});
                4'b1_110: match1 =
                        ({(match_cond1_ct[31] ^ dcr1[`OR1200_DU_DCR_SC]), match_cond1_ct[30:0]} !=
                         {(dvr1[31] ^ dcr1[`OR1200_DU_DCR_SC]), dvr1[30:0]});
        endcase
 
//
// Watchpoint 1
//
always @(dmr1 or match1 or wp)
        case (dmr1[`OR1200_DU_DMR1_CW1])
                2'b00: wp[1] = match1;
                2'b01: wp[1] = match1 & wp[0];
                2'b10: wp[1] = match1 | wp[0];
                2'b11: wp[1] = 1'b0;
        endcase
 
//
// Compare To What (Match Condition 2)
//
always @(dcr2 or id_pc or dcpu_adr_i or dcpu_dat_dc
        or dcpu_dat_lsu or dcpu_we_i)
        case (dcr2[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b001: match_cond2_ct = id_pc;         // insn fetch EA
                3'b010: match_cond2_ct = dcpu_adr_i;    // load EA
                3'b011: match_cond2_ct = dcpu_adr_i;    // store EA
                3'b100: match_cond2_ct = dcpu_dat_dc;   // load data
                3'b101: match_cond2_ct = dcpu_dat_lsu;  // store data
                3'b110: match_cond2_ct = dcpu_adr_i;    // load/store EA
                default:match_cond2_ct = dcpu_we_i ? dcpu_dat_lsu : dcpu_dat_dc;
        endcase
 
//
// When To Compare (Match Condition 2)
//
always @(dcr2 or dcpu_cycstb_i)
        case (dcr2[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b000: match_cond2_stb = 1'b0;         //comparison disabled
                3'b001: match_cond2_stb = 1'b1;         // insn fetch EA
                default:match_cond2_stb = dcpu_cycstb_i; // any load/store
        endcase
 
//
// Match Condition 2
//
always @(match_cond2_stb or dcr2 or dvr2 or match_cond2_ct)
        casex ({match_cond2_stb, dcr2[`OR1200_DU_DCR_CC]})
                4'b0_xxx,
                4'b1_000,
                4'b1_111: match2 = 1'b0;
                4'b1_001: match2 =
                        ({(match_cond2_ct[31] ^ dcr2[`OR1200_DU_DCR_SC]), match_cond2_ct[30:0]} ==
                         {(dvr2[31] ^ dcr2[`OR1200_DU_DCR_SC]), dvr2[30:0]});
                4'b1_010: match2 =
                        ({(match_cond2_ct[31] ^ dcr2[`OR1200_DU_DCR_SC]), match_cond2_ct[30:0]} <
                         {(dvr2[31] ^ dcr2[`OR1200_DU_DCR_SC]), dvr2[30:0]});
                4'b1_011: match2 =
                        ({(match_cond2_ct[31] ^ dcr2[`OR1200_DU_DCR_SC]), match_cond2_ct[30:0]} <=
                         {(dvr2[31] ^ dcr2[`OR1200_DU_DCR_SC]), dvr2[30:0]});
                4'b1_100: match2 =
                        ({(match_cond2_ct[31] ^ dcr2[`OR1200_DU_DCR_SC]), match_cond2_ct[30:0]} >
                         {(dvr2[31] ^ dcr2[`OR1200_DU_DCR_SC]), dvr2[30:0]});
                4'b1_101: match2 =
                        ({(match_cond2_ct[31] ^ dcr2[`OR1200_DU_DCR_SC]), match_cond2_ct[30:0]} >=
                         {(dvr2[31] ^ dcr2[`OR1200_DU_DCR_SC]), dvr2[30:0]});
                4'b1_110: match2 =
                        ({(match_cond2_ct[31] ^ dcr2[`OR1200_DU_DCR_SC]), match_cond2_ct[30:0]} !=
                         {(dvr2[31] ^ dcr2[`OR1200_DU_DCR_SC]), dvr2[30:0]});
        endcase
 
//
// Watchpoint 2
//
always @(dmr1 or match2 or wp)
        case (dmr1[`OR1200_DU_DMR1_CW2])
                2'b00: wp[2] = match2;
                2'b01: wp[2] = match2 & wp[1];
                2'b10: wp[2] = match2 | wp[1];
                2'b11: wp[2] = 1'b0;
        endcase
 
//
// Compare To What (Match Condition 3)
//
always @(dcr3 or id_pc or dcpu_adr_i or dcpu_dat_dc
        or dcpu_dat_lsu or dcpu_we_i)
        case (dcr3[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b001: match_cond3_ct = id_pc;         // insn fetch EA
                3'b010: match_cond3_ct = dcpu_adr_i;    // load EA
                3'b011: match_cond3_ct = dcpu_adr_i;    // store EA
                3'b100: match_cond3_ct = dcpu_dat_dc;   // load data
                3'b101: match_cond3_ct = dcpu_dat_lsu;  // store data
                3'b110: match_cond3_ct = dcpu_adr_i;    // load/store EA
                default:match_cond3_ct = dcpu_we_i ? dcpu_dat_lsu : dcpu_dat_dc;
        endcase
 
//
// When To Compare (Match Condition 3)
//
always @(dcr3 or dcpu_cycstb_i)
        case (dcr3[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b000: match_cond3_stb = 1'b0;         //comparison disabled
                3'b001: match_cond3_stb = 1'b1;         // insn fetch EA
                default:match_cond3_stb = dcpu_cycstb_i; // any load/store
        endcase
 
//
// Match Condition 3
//
always @(match_cond3_stb or dcr3 or dvr3 or match_cond3_ct)
        casex ({match_cond3_stb, dcr3[`OR1200_DU_DCR_CC]})
                4'b0_xxx,
                4'b1_000,
                4'b1_111: match3 = 1'b0;
                4'b1_001: match3 =
                        ({(match_cond3_ct[31] ^ dcr3[`OR1200_DU_DCR_SC]), match_cond3_ct[30:0]} ==
                         {(dvr3[31] ^ dcr3[`OR1200_DU_DCR_SC]), dvr3[30:0]});
                4'b1_010: match3 =
                        ({(match_cond3_ct[31] ^ dcr3[`OR1200_DU_DCR_SC]), match_cond3_ct[30:0]} <
                         {(dvr3[31] ^ dcr3[`OR1200_DU_DCR_SC]), dvr3[30:0]});
                4'b1_011: match3 =
                        ({(match_cond3_ct[31] ^ dcr3[`OR1200_DU_DCR_SC]), match_cond3_ct[30:0]} <=
                         {(dvr3[31] ^ dcr3[`OR1200_DU_DCR_SC]), dvr3[30:0]});
                4'b1_100: match3 =
                        ({(match_cond3_ct[31] ^ dcr3[`OR1200_DU_DCR_SC]), match_cond3_ct[30:0]} >
                         {(dvr3[31] ^ dcr3[`OR1200_DU_DCR_SC]), dvr3[30:0]});
                4'b1_101: match3 =
                        ({(match_cond3_ct[31] ^ dcr3[`OR1200_DU_DCR_SC]), match_cond3_ct[30:0]} >=
                         {(dvr3[31] ^ dcr3[`OR1200_DU_DCR_SC]), dvr3[30:0]});
                4'b1_110: match3 =
                        ({(match_cond3_ct[31] ^ dcr3[`OR1200_DU_DCR_SC]), match_cond3_ct[30:0]} !=
                         {(dvr3[31] ^ dcr3[`OR1200_DU_DCR_SC]), dvr3[30:0]});
        endcase
 
//
// Watchpoint 3
//
always @(dmr1 or match3 or wp)
        case (dmr1[`OR1200_DU_DMR1_CW3])
                2'b00: wp[3] = match3;
                2'b01: wp[3] = match3 & wp[2];
                2'b10: wp[3] = match3 | wp[2];
                2'b11: wp[3] = 1'b0;
        endcase
 
//
// Compare To What (Match Condition 4)
//
always @(dcr4 or id_pc or dcpu_adr_i or dcpu_dat_dc
        or dcpu_dat_lsu or dcpu_we_i)
        case (dcr4[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b001: match_cond4_ct = id_pc;         // insn fetch EA
                3'b010: match_cond4_ct = dcpu_adr_i;    // load EA
                3'b011: match_cond4_ct = dcpu_adr_i;    // store EA
                3'b100: match_cond4_ct = dcpu_dat_dc;   // load data
                3'b101: match_cond4_ct = dcpu_dat_lsu;  // store data
                3'b110: match_cond4_ct = dcpu_adr_i;    // load/store EA
                default:match_cond4_ct = dcpu_we_i ? dcpu_dat_lsu : dcpu_dat_dc;
        endcase
 
//
// When To Compare (Match Condition 4)
//
always @(dcr4 or dcpu_cycstb_i)
        case (dcr4[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b000: match_cond4_stb = 1'b0;         //comparison disabled
                3'b001: match_cond4_stb = 1'b1;         // insn fetch EA
                default:match_cond4_stb = dcpu_cycstb_i; // any load/store
        endcase
 
//
// Match Condition 4
//
always @(match_cond4_stb or dcr4 or dvr4 or match_cond4_ct)
        casex ({match_cond4_stb, dcr4[`OR1200_DU_DCR_CC]})
                4'b0_xxx,
                4'b1_000,
                4'b1_111: match4 = 1'b0;
                4'b1_001: match4 =
                        ({(match_cond4_ct[31] ^ dcr4[`OR1200_DU_DCR_SC]), match_cond4_ct[30:0]} ==
                         {(dvr4[31] ^ dcr4[`OR1200_DU_DCR_SC]), dvr4[30:0]});
                4'b1_010: match4 =
                        ({(match_cond4_ct[31] ^ dcr4[`OR1200_DU_DCR_SC]), match_cond4_ct[30:0]} <
                         {(dvr4[31] ^ dcr4[`OR1200_DU_DCR_SC]), dvr4[30:0]});
                4'b1_011: match4 =
                        ({(match_cond4_ct[31] ^ dcr4[`OR1200_DU_DCR_SC]), match_cond4_ct[30:0]} <=
                         {(dvr4[31] ^ dcr4[`OR1200_DU_DCR_SC]), dvr4[30:0]});
                4'b1_100: match4 =
                        ({(match_cond4_ct[31] ^ dcr4[`OR1200_DU_DCR_SC]), match_cond4_ct[30:0]} >
                         {(dvr4[31] ^ dcr4[`OR1200_DU_DCR_SC]), dvr4[30:0]});
                4'b1_101: match4 =
                        ({(match_cond4_ct[31] ^ dcr4[`OR1200_DU_DCR_SC]), match_cond4_ct[30:0]} >=
                         {(dvr4[31] ^ dcr4[`OR1200_DU_DCR_SC]), dvr4[30:0]});
                4'b1_110: match4 =
                        ({(match_cond4_ct[31] ^ dcr4[`OR1200_DU_DCR_SC]), match_cond4_ct[30:0]} !=
                         {(dvr4[31] ^ dcr4[`OR1200_DU_DCR_SC]), dvr4[30:0]});
        endcase
 
//
// Watchpoint 4
//
always @(dmr1 or match4 or wp)
        case (dmr1[`OR1200_DU_DMR1_CW4])
                2'b00: wp[4] = match4;
                2'b01: wp[4] = match4 & wp[3];
                2'b10: wp[4] = match4 | wp[3];
                2'b11: wp[4] = 1'b0;
        endcase
 
//
// Compare To What (Match Condition 5)
//
always @(dcr5 or id_pc or dcpu_adr_i or dcpu_dat_dc
        or dcpu_dat_lsu or dcpu_we_i)
        case (dcr5[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b001: match_cond5_ct = id_pc;         // insn fetch EA
                3'b010: match_cond5_ct = dcpu_adr_i;    // load EA
                3'b011: match_cond5_ct = dcpu_adr_i;    // store EA
                3'b100: match_cond5_ct = dcpu_dat_dc;   // load data
                3'b101: match_cond5_ct = dcpu_dat_lsu;  // store data
                3'b110: match_cond5_ct = dcpu_adr_i;    // load/store EA
                default:match_cond5_ct = dcpu_we_i ? dcpu_dat_lsu : dcpu_dat_dc;
        endcase
 
//
// When To Compare (Match Condition 5)
//
always @(dcr5 or dcpu_cycstb_i)
        case (dcr5[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b000: match_cond5_stb = 1'b0;         //comparison disabled
                3'b001: match_cond5_stb = 1'b1;         // insn fetch EA
                default:match_cond5_stb = dcpu_cycstb_i; // any load/store
        endcase
 
//
// Match Condition 5
//
always @(match_cond5_stb or dcr5 or dvr5 or match_cond5_ct)
        casex ({match_cond5_stb, dcr5[`OR1200_DU_DCR_CC]})
                4'b0_xxx,
                4'b1_000,
                4'b1_111: match5 = 1'b0;
                4'b1_001: match5 =
                        ({(match_cond5_ct[31] ^ dcr5[`OR1200_DU_DCR_SC]), match_cond5_ct[30:0]} ==
                         {(dvr5[31] ^ dcr5[`OR1200_DU_DCR_SC]), dvr5[30:0]});
                4'b1_010: match5 =
                        ({(match_cond5_ct[31] ^ dcr5[`OR1200_DU_DCR_SC]), match_cond5_ct[30:0]} <
                         {(dvr5[31] ^ dcr5[`OR1200_DU_DCR_SC]), dvr5[30:0]});
                4'b1_011: match5 =
                        ({(match_cond5_ct[31] ^ dcr5[`OR1200_DU_DCR_SC]), match_cond5_ct[30:0]} <=
                         {(dvr5[31] ^ dcr5[`OR1200_DU_DCR_SC]), dvr5[30:0]});
                4'b1_100: match5 =
                        ({(match_cond5_ct[31] ^ dcr5[`OR1200_DU_DCR_SC]), match_cond5_ct[30:0]} >
                         {(dvr5[31] ^ dcr5[`OR1200_DU_DCR_SC]), dvr5[30:0]});
                4'b1_101: match5 =
                        ({(match_cond5_ct[31] ^ dcr5[`OR1200_DU_DCR_SC]), match_cond5_ct[30:0]} >=
                         {(dvr5[31] ^ dcr5[`OR1200_DU_DCR_SC]), dvr5[30:0]});
                4'b1_110: match5 =
                        ({(match_cond5_ct[31] ^ dcr5[`OR1200_DU_DCR_SC]), match_cond5_ct[30:0]} !=
                         {(dvr5[31] ^ dcr5[`OR1200_DU_DCR_SC]), dvr5[30:0]});
        endcase
 
//
// Watchpoint 5
//
always @(dmr1 or match5 or wp)
        case (dmr1[`OR1200_DU_DMR1_CW5])
                2'b00: wp[5] = match5;
                2'b01: wp[5] = match5 & wp[4];
                2'b10: wp[5] = match5 | wp[4];
                2'b11: wp[5] = 1'b0;
        endcase
 
//
// Compare To What (Match Condition 6)
//
always @(dcr6 or id_pc or dcpu_adr_i or dcpu_dat_dc
        or dcpu_dat_lsu or dcpu_we_i)
        case (dcr6[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b001: match_cond6_ct = id_pc;         // insn fetch EA
                3'b010: match_cond6_ct = dcpu_adr_i;    // load EA
                3'b011: match_cond6_ct = dcpu_adr_i;    // store EA
                3'b100: match_cond6_ct = dcpu_dat_dc;   // load data
                3'b101: match_cond6_ct = dcpu_dat_lsu;  // store data
                3'b110: match_cond6_ct = dcpu_adr_i;    // load/store EA
                default:match_cond6_ct = dcpu_we_i ? dcpu_dat_lsu : dcpu_dat_dc;
        endcase
 
//
// When To Compare (Match Condition 6)
//
always @(dcr6 or dcpu_cycstb_i)
        case (dcr6[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b000: match_cond6_stb = 1'b0;         //comparison disabled
                3'b001: match_cond6_stb = 1'b1;         // insn fetch EA
                default:match_cond6_stb = dcpu_cycstb_i; // any load/store
        endcase
 
//
// Match Condition 6
//
always @(match_cond6_stb or dcr6 or dvr6 or match_cond6_ct)
        casex ({match_cond6_stb, dcr6[`OR1200_DU_DCR_CC]})
                4'b0_xxx,
                4'b1_000,
                4'b1_111: match6 = 1'b0;
                4'b1_001: match6 =
                        ({(match_cond6_ct[31] ^ dcr6[`OR1200_DU_DCR_SC]), match_cond6_ct[30:0]} ==
                         {(dvr6[31] ^ dcr6[`OR1200_DU_DCR_SC]), dvr6[30:0]});
                4'b1_010: match6 =
                        ({(match_cond6_ct[31] ^ dcr6[`OR1200_DU_DCR_SC]), match_cond6_ct[30:0]} <
                         {(dvr6[31] ^ dcr6[`OR1200_DU_DCR_SC]), dvr6[30:0]});
                4'b1_011: match6 =
                        ({(match_cond6_ct[31] ^ dcr6[`OR1200_DU_DCR_SC]), match_cond6_ct[30:0]} <=
                         {(dvr6[31] ^ dcr6[`OR1200_DU_DCR_SC]), dvr6[30:0]});
                4'b1_100: match6 =
                        ({(match_cond6_ct[31] ^ dcr6[`OR1200_DU_DCR_SC]), match_cond6_ct[30:0]} >
                         {(dvr6[31] ^ dcr6[`OR1200_DU_DCR_SC]), dvr6[30:0]});
                4'b1_101: match6 =
                        ({(match_cond6_ct[31] ^ dcr6[`OR1200_DU_DCR_SC]), match_cond6_ct[30:0]} >=
                         {(dvr6[31] ^ dcr6[`OR1200_DU_DCR_SC]), dvr6[30:0]});
                4'b1_110: match6 =
                        ({(match_cond6_ct[31] ^ dcr6[`OR1200_DU_DCR_SC]), match_cond6_ct[30:0]} !=
                         {(dvr6[31] ^ dcr6[`OR1200_DU_DCR_SC]), dvr6[30:0]});
        endcase
 
//
// Watchpoint 6
//
always @(dmr1 or match6 or wp)
        case (dmr1[`OR1200_DU_DMR1_CW6])
                2'b00: wp[6] = match6;
                2'b01: wp[6] = match6 & wp[5];
                2'b10: wp[6] = match6 | wp[5];
                2'b11: wp[6] = 1'b0;
        endcase
 
//
// Compare To What (Match Condition 7)
//
always @(dcr7 or id_pc or dcpu_adr_i or dcpu_dat_dc
        or dcpu_dat_lsu or dcpu_we_i)
        case (dcr7[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b001: match_cond7_ct = id_pc;         // insn fetch EA
                3'b010: match_cond7_ct = dcpu_adr_i;    // load EA
                3'b011: match_cond7_ct = dcpu_adr_i;    // store EA
                3'b100: match_cond7_ct = dcpu_dat_dc;   // load data
                3'b101: match_cond7_ct = dcpu_dat_lsu;  // store data
                3'b110: match_cond7_ct = dcpu_adr_i;    // load/store EA
                default:match_cond7_ct = dcpu_we_i ? dcpu_dat_lsu : dcpu_dat_dc;
        endcase
 
//
// When To Compare (Match Condition 7)
//
always @(dcr7 or dcpu_cycstb_i)
        case (dcr7[`OR1200_DU_DCR_CT])          // synopsys parallel_case
                3'b000: match_cond7_stb = 1'b0;         //comparison disabled
                3'b001: match_cond7_stb = 1'b1;         // insn fetch EA
                default:match_cond7_stb = dcpu_cycstb_i; // any load/store
        endcase
 
//
// Match Condition 7
//
always @(match_cond7_stb or dcr7 or dvr7 or match_cond7_ct)
        casex ({match_cond7_stb, dcr7[`OR1200_DU_DCR_CC]})
                4'b0_xxx,
                4'b1_000,
                4'b1_111: match7 = 1'b0;
                4'b1_001: match7 =
                        ({(match_cond7_ct[31] ^ dcr7[`OR1200_DU_DCR_SC]), match_cond7_ct[30:0]} ==
                         {(dvr7[31] ^ dcr7[`OR1200_DU_DCR_SC]), dvr7[30:0]});
                4'b1_010: match7 =
                        ({(match_cond7_ct[31] ^ dcr7[`OR1200_DU_DCR_SC]), match_cond7_ct[30:0]} <
                         {(dvr7[31] ^ dcr7[`OR1200_DU_DCR_SC]), dvr7[30:0]});
                4'b1_011: match7 =
                        ({(match_cond7_ct[31] ^ dcr7[`OR1200_DU_DCR_SC]), match_cond7_ct[30:0]} <=
                         {(dvr7[31] ^ dcr7[`OR1200_DU_DCR_SC]), dvr7[30:0]});
                4'b1_100: match7 =
                        ({(match_cond7_ct[31] ^ dcr7[`OR1200_DU_DCR_SC]), match_cond7_ct[30:0]} >
                         {(dvr7[31] ^ dcr7[`OR1200_DU_DCR_SC]), dvr7[30:0]});
                4'b1_101: match7 =
                        ({(match_cond7_ct[31] ^ dcr7[`OR1200_DU_DCR_SC]), match_cond7_ct[30:0]} >=
                         {(dvr7[31] ^ dcr7[`OR1200_DU_DCR_SC]), dvr7[30:0]});
                4'b1_110: match7 =
                        ({(match_cond7_ct[31] ^ dcr7[`OR1200_DU_DCR_SC]), match_cond7_ct[30:0]} !=
                         {(dvr7[31] ^ dcr7[`OR1200_DU_DCR_SC]), dvr7[30:0]});
        endcase
 
//
// Watchpoint 7
//
always @(dmr1 or match7 or wp)
        case (dmr1[`OR1200_DU_DMR1_CW7])
                2'b00: wp[7] = match7;
                2'b01: wp[7] = match7 & wp[6];
                2'b10: wp[7] = match7 | wp[6];
                2'b11: wp[7] = 1'b0;
        endcase
 
//
// Increment Watchpoint Counter 0
//
always @(wp or dmr2)
        if (dmr2[`OR1200_DU_DMR2_WCE0])
                incr_wpcntr0 = |(wp & ~dmr2[`OR1200_DU_DMR2_AWTC]);
        else
                incr_wpcntr0 = 1'b0;
 
//
// Match Condition Watchpoint Counter 0
//
always @(dwcr0)
        if (dwcr0[`OR1200_DU_DWCR_MATCH] == dwcr0[`OR1200_DU_DWCR_COUNT])
                wpcntr0_match = 1'b1;
        else
                wpcntr0_match = 1'b0;
 
 
//
// Watchpoint 8
//
always @(dmr1 or wpcntr0_match or wp)
        case (dmr1[`OR1200_DU_DMR1_CW8])
                2'b00: wp[8] = wpcntr0_match;
                2'b01: wp[8] = wpcntr0_match & wp[7];
                2'b10: wp[8] = wpcntr0_match | wp[7];
                2'b11: wp[8] = 1'b0;
        endcase
 
 
//
// Increment Watchpoint Counter 1
//
always @(wp or dmr2)
        if (dmr2[`OR1200_DU_DMR2_WCE1])
                incr_wpcntr1 = |(wp & dmr2[`OR1200_DU_DMR2_AWTC]);
        else
                incr_wpcntr1 = 1'b0;
 
//
// Match Condition Watchpoint Counter 1
//
always @(dwcr1)
        if (dwcr1[`OR1200_DU_DWCR_MATCH] == dwcr1[`OR1200_DU_DWCR_COUNT])
                wpcntr1_match = 1'b1;
        else
                wpcntr1_match = 1'b0;
 
//
// Watchpoint 9
//
always @(dmr1 or wpcntr1_match or wp)
        case (dmr1[`OR1200_DU_DMR1_CW9])
                2'b00: wp[9] = wpcntr1_match;
                2'b01: wp[9] = wpcntr1_match & wp[8];
                2'b10: wp[9] = wpcntr1_match | wp[8];
                2'b11: wp[9] = 1'b0;
        endcase
 
//
// Watchpoint 10
//
always @(dmr1 or dbg_ewt_i or wp)
        case (dmr1[`OR1200_DU_DMR1_CW10])
                2'b00: wp[10] = dbg_ewt_i;
                2'b01: wp[10] = dbg_ewt_i & wp[9];
                2'b10: wp[10] = dbg_ewt_i | wp[9];
                2'b11: wp[10] = 1'b0;
        endcase
 
`endif
 
//
// Watchpoints can cause trap exception
//
`ifdef OR1200_DU_HWBKPTS
assign du_hwbkpt = |(wp & dmr2[`OR1200_DU_DMR2_WGB]) | du_hwbkpt_hold | (dbg_bp_r & ~dsr[`OR1200_DU_DSR_TE]);
`else
assign du_hwbkpt = 1'b0;
`endif
 
// Hold du_hwbkpt if ex_freeze is active in order to cause trap exception 
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                du_hwbkpt_hold <=  1'b0;
        else if (du_hwbkpt & ex_freeze)
                du_hwbkpt_hold <=  1'b1;
        else if (!ex_freeze)
                du_hwbkpt_hold <=  1'b0;
 
`ifdef OR1200_DU_TB_IMPLEMENTED
//
// Simple trace buffer
// (right now hardcoded for Xilinx Virtex FPGAs)
//
// Stores last 256 instruction addresses, instruction
// machine words and ALU results
//
 
//
// Trace buffer write enable
//
assign tb_enw = ~ex_freeze & ~((ex_insn[31:26] == `OR1200_OR32_NOP) & ex_insn[16]);
 
//
// Trace buffer write address pointer
//
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                tb_wadr <=  8'h00;
        else if (tb_enw)
                tb_wadr <=  tb_wadr + 8'd1;
 
//
// Free running counter (time stamp)
//
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                tb_timstmp <=  32'h00000000;
        else if (!dbg_bp_r)
                tb_timstmp <=  tb_timstmp + 32'd1;
 
//
// Trace buffer RAMs
//
 
or1200_dpram_256x32 tbia_ram(
        .clk_a(clk),
        .rst_a(1'b0),
        .addr_a(spr_addr[7:0]),
        .ce_a(1'b1),
        .oe_a(1'b1),
        .do_a(tbia_dat_o),
 
        .clk_b(clk),
        .rst_b(1'b0),
        .addr_b(tb_wadr),
        .di_b(spr_dat_npc),
        .ce_b(1'b1),
        .we_b(tb_enw)
 
);
 
or1200_dpram_256x32 tbim_ram(
        .clk_a(clk),
        .rst_a(1'b0),
        .addr_a(spr_addr[7:0]),
        .ce_a(1'b1),
        .oe_a(1'b1),
        .do_a(tbim_dat_o),
 
        .clk_b(clk),
        .rst_b(1'b0),
        .addr_b(tb_wadr),
        .di_b(ex_insn),
        .ce_b(1'b1),
        .we_b(tb_enw)
);
 
or1200_dpram_256x32 tbar_ram(
        .clk_a(clk),
        .rst_a(1'b0),
        .addr_a(spr_addr[7:0]),
        .ce_a(1'b1),
        .oe_a(1'b1),
        .do_a(tbar_dat_o),
 
        .clk_b(clk),
        .rst_b(1'b0),
        .addr_b(tb_wadr),
        .di_b(rf_dataw),
        .ce_b(1'b1),
        .we_b(tb_enw)
);
 
or1200_dpram_256x32 tbts_ram(
        .clk_a(clk),
        .rst_a(1'b0),
        .addr_a(spr_addr[7:0]),
        .ce_a(1'b1),
        .oe_a(1'b1),
        .do_a(tbts_dat_o),
 
        .clk_b(clk),
        .rst_b(1'b0),
        .addr_b(tb_wadr),
        .di_b(tb_timstmp),
        .ce_b(1'b1),
        .we_b(tb_enw)
);
 
`else
 
assign tbia_dat_o = 32'h0000_0000;
assign tbim_dat_o = 32'h0000_0000;
assign tbar_dat_o = 32'h0000_0000;
assign tbts_dat_o = 32'h0000_0000;
 
`endif  // OR1200_DU_TB_IMPLEMENTED
 
`else   // OR1200_DU_IMPLEMENTED
 
//
// When DU is not implemented, drive all outputs as would when DU is disabled
//
assign dbg_bp_o = 1'b0;
assign du_dsr = {`OR1200_DU_DSR_WIDTH{1'b0}};
assign du_dmr1 = {25{1'b0}};
assign du_hwbkpt = 1'b0;
 
//
// Read DU registers
//
`ifdef OR1200_DU_READREGS
assign spr_dat_o = 32'h0000_0000;
`ifdef OR1200_DU_UNUSED_ZERO
`endif
`endif
 
`endif
 
endmodule

Line No.	Rev	Author	Line
1	10	unneback	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// OR1200's Debug Unit ////`
4			`//// ////`
5			`//// This file is part of the OpenRISC 1200 project ////`
6	185	julius	`//// http://www.opencores.org/project,or1k ////`
7	10	unneback	`//// ////`
8			`//// Description ////`
9			`//// Basic OR1200 debug unit. ////`
10			`//// ////`
11			`//// To Do: ////`
12			`//// - make it smaller and faster ////`
13			`//// ////`
14			`//// Author(s): ////`
15			`//// - Damjan Lampret, lampret@opencores.org ////`
16			`//// ////`
17			`//////////////////////////////////////////////////////////////////////`
18			`//// ////`
19			`//// Copyright (C) 2000 Authors and OPENCORES.ORG ////`
20			`//// ////`
21			`//// This source file may be used and distributed without ////`
22			`//// restriction provided that this copyright statement is not ////`
23			`//// removed from the file and that any derivative work contains ////`
24			`//// the original copyright notice and the associated disclaimer. ////`
25			`//// ////`
26			`//// This source file is free software; you can redistribute it ////`
27			`//// and/or modify it under the terms of the GNU Lesser General ////`
28			`//// Public License as published by the Free Software Foundation; ////`
29			`//// either version 2.1 of the License, or (at your option) any ////`
30			`//// later version. ////`
31			`//// ////`
32			`//// This source is distributed in the hope that it will be ////`
33			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
34			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
35			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
36			`//// details. ////`
37			`//// ////`
38			`//// You should have received a copy of the GNU Lesser General ////`
39			`//// Public License along with this source; if not, download it ////`
40			`//// from http://www.opencores.org/lgpl.shtml ////`
41			`//// ////`
42			`//////////////////////////////////////////////////////////////////////`
43			`//`
44			`//`
45	141	marcus.erl	`// $Log: or1200_du.v,v $`
46			`// Revision 2.0 2010/06/30 11:00:00 ORSoC`
47			`// Minor update:`
48			`// Bugs fixed.`
49	10	unneback
50			`// synopsys translate_off`
51			`include "timescale.v"
52			`// synopsys translate_on`
53			`include "or1200_defines.v"
54
55			`//`
56			`// Debug unit`
57			`//`
58
59			`module or1200_du(`
60			`// RISC Internal Interface`
61			`clk, rst,`
62			`dcpu_cycstb_i, dcpu_we_i, dcpu_adr_i, dcpu_dat_lsu,`
63			`dcpu_dat_dc, icpu_cycstb_i,`
64			`ex_freeze, branch_op, ex_insn, id_pc,`
65			`spr_dat_npc, rf_dataw,`
66	141	marcus.erl	`du_dsr, du_dmr1, du_stall, du_addr, du_dat_i, du_dat_o,`
67			`du_read, du_write, du_except_stop, du_hwbkpt,`
68	10	unneback	`spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o,`
69
70			`// External Debug Interface`
71			`dbg_stall_i, dbg_ewt_i, dbg_lss_o, dbg_is_o, dbg_wp_o, dbg_bp_o,`
72			`dbg_stb_i, dbg_we_i, dbg_adr_i, dbg_dat_i, dbg_dat_o, dbg_ack_o`
73			`);`
74
75			parameter dw = `OR1200_OPERAND_WIDTH;
76			parameter aw = `OR1200_OPERAND_WIDTH;
77
78			`//`
79			`// I/O`
80			`//`
81
82			`//`
83			`// RISC Internal Interface`
84			`//`
85			`input clk; // Clock`
86			`input rst; // Reset`
87			`input dcpu_cycstb_i; // LSU status`
88			`input dcpu_we_i; // LSU status`
89			`input [31:0] dcpu_adr_i; // LSU addr`
90			`input [31:0] dcpu_dat_lsu; // LSU store data`
91			`input [31:0] dcpu_dat_dc; // LSU load data`
92			input [`OR1200_FETCHOP_WIDTH-1:0] icpu_cycstb_i; // IFETCH unit status
93			`input ex_freeze; // EX stage freeze`
94			input [`OR1200_BRANCHOP_WIDTH-1:0] branch_op; // Branch op
95			`input [dw-1:0] ex_insn; // EX insn`
96			`input [31:0] id_pc; // insn fetch EA`
97			`input [31:0] spr_dat_npc; // Next PC (for trace)`
98			`input [31:0] rf_dataw; // ALU result (for trace)`
99			output [`OR1200_DU_DSR_WIDTH-1:0] du_dsr; // DSR
100	141	marcus.erl	`output [24: 0] du_dmr1;`
101	10	unneback	`output du_stall; // Debug Unit Stall`
102			`output [aw-1:0] du_addr; // Debug Unit Address`
103			`input [dw-1:0] du_dat_i; // Debug Unit Data In`
104			`output [dw-1:0] du_dat_o; // Debug Unit Data Out`
105			`output du_read; // Debug Unit Read Enable`
106			`output du_write; // Debug Unit Write Enable`
107	185	julius	`input [13:0] du_except_stop; // Exception masked by DSR`
108	10	unneback	`output du_hwbkpt; // Cause trap exception (HW Breakpoints)`
109			`input spr_cs; // SPR Chip Select`
110			`input spr_write; // SPR Read/Write`
111			`input [aw-1:0] spr_addr; // SPR Address`
112			`input [dw-1:0] spr_dat_i; // SPR Data Input`
113			`output [dw-1:0] spr_dat_o; // SPR Data Output`
114
115			`//`
116			`// External Debug Interface`
117			`//`
118			`input dbg_stall_i; // External Stall Input`
119			`input dbg_ewt_i; // External Watchpoint Trigger Input`
120			`output [3:0] dbg_lss_o; // External Load/Store Unit Status`
121			`output [1:0] dbg_is_o; // External Insn Fetch Status`
122			`output [10:0] dbg_wp_o; // Watchpoints Outputs`
123			`output dbg_bp_o; // Breakpoint Output`
124			`input dbg_stb_i; // External Address/Data Strobe`
125			`input dbg_we_i; // External Write Enable`
126			`input [aw-1:0] dbg_adr_i; // External Address Input`
127			`input [dw-1:0] dbg_dat_i; // External Data Input`
128			`output [dw-1:0] dbg_dat_o; // External Data Output`
129			`output dbg_ack_o; // External Data Acknowledge (not WB compatible)`
130	141	marcus.erl	`reg [dw-1:0] dbg_dat_o; // External Data Output`
131			`reg dbg_ack_o; // External Data Acknowledge (not WB compatible)`
132	10	unneback
133
134			`//`
135			`// Some connections go directly from the CPU through DU to Debug I/F`
136			`//`
137			`ifdef OR1200_DU_STATUS_UNIMPLEMENTED
138			`assign dbg_lss_o = 4'b0000;`
139
140			`reg [1:0] dbg_is_o;`
141			`//`
142			`// Show insn activity (temp, must be removed)`
143			`//`
144	358	julius	always @(posedge clk or `OR1200_RST_EVENT rst)
145			if (rst == `OR1200_RST_VALUE)
146	258	julius	`dbg_is_o <= 2'b00;`
147	141	marcus.erl	else if (!ex_freeze & ~((ex_insn[31:26] == `OR1200_OR32_NOP) & ex_insn[16]))
148	258	julius	`dbg_is_o <= ~dbg_is_o;`
149	10	unneback	`ifdef UNUSED
150			`assign dbg_is_o = 2'b00;`
151			`endif
152			`else
153			`assign dbg_lss_o = dcpu_cycstb_i ? {dcpu_we_i, 3'b000} : 4'b0000;`
154			`assign dbg_is_o = {1'b0, icpu_cycstb_i};`
155			`endif
156			`assign dbg_wp_o = 11'b000_0000_0000;`
157
158			`//`
159			`// Some connections go directly from Debug I/F through DU to the CPU`
160			`//`
161			`assign du_stall = dbg_stall_i;`
162			`assign du_addr = dbg_adr_i;`
163			`assign du_dat_o = dbg_dat_i;`
164			`assign du_read = dbg_stb_i && !dbg_we_i;`
165			`assign du_write = dbg_stb_i && dbg_we_i;`
166
167	141	marcus.erl	`reg dbg_ack;`
168	10	unneback	`//`
169			`// Generate acknowledge -- just delay stb signal`
170			`//`
171	358	julius	always @(posedge clk or `OR1200_RST_EVENT rst) begin
172			if (rst == `OR1200_RST_VALUE) begin
173	258	julius	`dbg_ack <= 1'b0;`
174			`dbg_ack_o <= 1'b0;`
175	141	marcus.erl	`end`
176			`else begin`
177	258	julius	`dbg_ack <= dbg_stb_i; // valid when du_dat_i`
178			`dbg_ack_o <= dbg_ack & dbg_stb_i; // valid when dbg_dat_o`
179	141	marcus.erl	`end`
180			`end`
181	10	unneback
182	141	marcus.erl	`//`
183			`// Register data output`
184			`//`
185			`always @(posedge clk)`
186	258	julius	`dbg_dat_o <= du_dat_i;`
187	141	marcus.erl
188	10	unneback	`ifdef OR1200_DU_IMPLEMENTED
189
190			`//`
191			`// Debug Mode Register 1`
192			`//`
193			`ifdef OR1200_DU_DMR1
194			`reg [24:0] dmr1; // DMR1 implemented`
195			`else
196			`wire [24:0] dmr1; // DMR1 not implemented`
197			`endif
198	141	marcus.erl	`assign du_dmr1 = dmr1;`
199	10	unneback
200			`//`
201			`// Debug Mode Register 2`
202			`//`
203			`ifdef OR1200_DU_DMR2
204			`reg [23:0] dmr2; // DMR2 implemented`
205			`else
206			`wire [23:0] dmr2; // DMR2 not implemented`
207			`endif
208
209			`//`
210			`// Debug Stop Register`
211			`//`
212			`ifdef OR1200_DU_DSR
213			reg [`OR1200_DU_DSR_WIDTH-1:0] dsr; // DSR implemented
214			`else
215			wire [`OR1200_DU_DSR_WIDTH-1:0] dsr; // DSR not implemented
216			`endif
217
218			`//`
219			`// Debug Reason Register`
220			`//`
221			`ifdef OR1200_DU_DRR
222			`reg [13:0] drr; // DRR implemented`
223			`else
224			`wire [13:0] drr; // DRR not implemented`
225			`endif
226
227			`//`
228			`// Debug Value Register N`
229			`//`
230			`ifdef OR1200_DU_DVR0
231			`reg [31:0] dvr0;`
232			`else
233			`wire [31:0] dvr0;`
234			`endif
235
236			`//`
237			`// Debug Value Register N`
238			`//`
239			`ifdef OR1200_DU_DVR1
240			`reg [31:0] dvr1;`
241			`else
242			`wire [31:0] dvr1;`
243			`endif
244
245			`//`
246			`// Debug Value Register N`
247			`//`
248			`ifdef OR1200_DU_DVR2
249			`reg [31:0] dvr2;`
250			`else
251			`wire [31:0] dvr2;`
252			`endif
253
254			`//`
255			`// Debug Value Register N`
256			`//`
257			`ifdef OR1200_DU_DVR3
258			`reg [31:0] dvr3;`
259			`else
260			`wire [31:0] dvr3;`
261			`endif
262
263			`//`
264			`// Debug Value Register N`
265			`//`
266			`ifdef OR1200_DU_DVR4
267			`reg [31:0] dvr4;`
268			`else
269			`wire [31:0] dvr4;`
270			`endif
271
272			`//`
273			`// Debug Value Register N`
274			`//`
275			`ifdef OR1200_DU_DVR5
276			`reg [31:0] dvr5;`
277			`else
278			`wire [31:0] dvr5;`
279			`endif
280
281			`//`
282			`// Debug Value Register N`
283			`//`
284			`ifdef OR1200_DU_DVR6
285			`reg [31:0] dvr6;`
286			`else
287			`wire [31:0] dvr6;`
288			`endif
289
290			`//`
291			`// Debug Value Register N`
292			`//`
293			`ifdef OR1200_DU_DVR7
294			`reg [31:0] dvr7;`
295			`else
296			`wire [31:0] dvr7;`
297			`endif
298
299			`//`
300			`// Debug Control Register N`
301			`//`
302			`ifdef OR1200_DU_DCR0
303			`reg [7:0] dcr0;`
304			`else
305			`wire [7:0] dcr0;`
306			`endif
307
308			`//`
309			`// Debug Control Register N`
310			`//`
311			`ifdef OR1200_DU_DCR1
312			`reg [7:0] dcr1;`
313			`else
314			`wire [7:0] dcr1;`
315			`endif
316
317			`//`
318			`// Debug Control Register N`
319			`//`
320			`ifdef OR1200_DU_DCR2
321			`reg [7:0] dcr2;`
322			`else
323			`wire [7:0] dcr2;`
324			`endif
325
326			`//`
327			`// Debug Control Register N`
328			`//`
329			`ifdef OR1200_DU_DCR3
330			`reg [7:0] dcr3;`
331			`else
332			`wire [7:0] dcr3;`
333			`endif
334
335			`//`
336			`// Debug Control Register N`
337			`//`
338			`ifdef OR1200_DU_DCR4
339			`reg [7:0] dcr4;`
340			`else
341			`wire [7:0] dcr4;`
342			`endif
343
344			`//`
345			`// Debug Control Register N`
346			`//`
347			`ifdef OR1200_DU_DCR5
348			`reg [7:0] dcr5;`
349			`else
350			`wire [7:0] dcr5;`
351			`endif
352
353			`//`
354			`// Debug Control Register N`
355			`//`
356			`ifdef OR1200_DU_DCR6
357			`reg [7:0] dcr6;`
358			`else
359			`wire [7:0] dcr6;`
360			`endif
361
362			`//`
363			`// Debug Control Register N`
364			`//`
365			`ifdef OR1200_DU_DCR7
366			`reg [7:0] dcr7;`
367			`else
368			`wire [7:0] dcr7;`
369			`endif
370
371			`//`
372			`// Debug Watchpoint Counter Register 0`
373			`//`
374			`ifdef OR1200_DU_DWCR0
375			`reg [31:0] dwcr0;`
376			`else
377			`wire [31:0] dwcr0;`
378			`endif
379
380			`//`
381			`// Debug Watchpoint Counter Register 1`
382			`//`
383			`ifdef OR1200_DU_DWCR1
384			`reg [31:0] dwcr1;`
385			`else
386			`wire [31:0] dwcr1;`
387			`endif
388
389			`//`
390			`// Internal wires`
391			`//`
392			`wire dmr1_sel; // DMR1 select`
393			`wire dmr2_sel; // DMR2 select`
394			`wire dsr_sel; // DSR select`
395			`wire drr_sel; // DRR select`
396			`wire dvr0_sel,`
397			`dvr1_sel,`
398			`dvr2_sel,`
399			`dvr3_sel,`
400			`dvr4_sel,`
401			`dvr5_sel,`
402			`dvr6_sel,`
403			`dvr7_sel; // DVR selects`
404			`wire dcr0_sel,`
405			`dcr1_sel,`
406			`dcr2_sel,`
407			`dcr3_sel,`
408			`dcr4_sel,`
409			`dcr5_sel,`
410			`dcr6_sel,`
411			`dcr7_sel; // DCR selects`
412			`wire dwcr0_sel,`
413			`dwcr1_sel; // DWCR selects`
414			`reg dbg_bp_r;`
415	815	yannv	`reg ex_freeze_q;`
416	10	unneback	`ifdef OR1200_DU_HWBKPTS
417			`reg [31:0] match_cond0_ct;`
418			`reg [31:0] match_cond1_ct;`
419			`reg [31:0] match_cond2_ct;`
420			`reg [31:0] match_cond3_ct;`
421			`reg [31:0] match_cond4_ct;`
422			`reg [31:0] match_cond5_ct;`
423			`reg [31:0] match_cond6_ct;`
424			`reg [31:0] match_cond7_ct;`
425			`reg match_cond0_stb;`
426			`reg match_cond1_stb;`
427			`reg match_cond2_stb;`
428			`reg match_cond3_stb;`
429			`reg match_cond4_stb;`
430			`reg match_cond5_stb;`
431			`reg match_cond6_stb;`
432			`reg match_cond7_stb;`
433			`reg match0;`
434			`reg match1;`
435			`reg match2;`
436			`reg match3;`
437			`reg match4;`
438			`reg match5;`
439			`reg match6;`
440			`reg match7;`
441			`reg wpcntr0_match;`
442			`reg wpcntr1_match;`
443			`reg incr_wpcntr0;`
444			`reg incr_wpcntr1;`
445			`reg [10:0] wp;`
446			`endif
447			`wire du_hwbkpt;`
448	141	marcus.erl	`reg du_hwbkpt_hold;`
449	10	unneback	`ifdef OR1200_DU_READREGS
450			`reg [31:0] spr_dat_o;`
451			`endif
452			`reg [13:0] except_stop; // Exceptions that stop because of DSR`
453			`ifdef OR1200_DU_TB_IMPLEMENTED
454			`wire tb_enw;`
455			`reg [7:0] tb_wadr;`
456			`reg [31:0] tb_timstmp;`
457			`endif
458			`wire [31:0] tbia_dat_o;`
459			`wire [31:0] tbim_dat_o;`
460			`wire [31:0] tbar_dat_o;`
461			`wire [31:0] tbts_dat_o;`
462
463			`//`
464			`// DU registers address decoder`
465			`//`
466			`ifdef OR1200_DU_DMR1
467			assign dmr1_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DMR1));
468			`endif
469			`ifdef OR1200_DU_DMR2
470			assign dmr2_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DMR2));
471			`endif
472			`ifdef OR1200_DU_DSR
473			assign dsr_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DSR));
474			`endif
475			`ifdef OR1200_DU_DRR
476			assign drr_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DRR));
477			`endif
478			`ifdef OR1200_DU_DVR0
479			assign dvr0_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR0));
480			`endif
481			`ifdef OR1200_DU_DVR1
482			assign dvr1_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR1));
483			`endif
484			`ifdef OR1200_DU_DVR2
485			assign dvr2_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR2));
486			`endif
487			`ifdef OR1200_DU_DVR3
488			assign dvr3_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR3));
489			`endif
490			`ifdef OR1200_DU_DVR4
491			assign dvr4_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR4));
492			`endif
493			`ifdef OR1200_DU_DVR5
494			assign dvr5_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR5));
495			`endif
496			`ifdef OR1200_DU_DVR6
497			assign dvr6_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR6));
498			`endif
499			`ifdef OR1200_DU_DVR7
500			assign dvr7_sel = (spr_cs && (spr_addr[`OR1200_DUOFS_BITS] == `OR1200_DU_DVR7));

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