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

////                                                              ////

////  OR1200 Top Level                                            ////

////                                                              ////

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

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

////                                                              ////

////  Description                                                 ////

////  OR1200 Top Level                                            ////

////                                                              ////

////  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 1.5  2002/02/11 04:33:17  lampret

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

//

// Revision 1.4  2002/02/01 19:56:55  lampret

// Fixed combinational loops.

//

// Revision 1.3  2002/01/28 01:16:00  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 1.2  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 1.1  2002/01/03 08:16:15  lampret

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

//

// Revision 1.13  2001/11/23 08:38:51  lampret

// Changed DSR/DRR behavior and exception detection.

//

// Revision 1.12  2001/11/20 00:57:22  lampret

// Fixed width of du_except.

//

// Revision 1.11  2001/11/18 08:36:28  lampret

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

//

// 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 13:12:10  lampret

// MP3 version.

//

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

// no message

//

// Revision 1.4  2001/08/13 03:36:20  lampret

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

//

// Revision 1.3  2001/08/09 13:39:33  lampret

// Major clean-up.

//

// Revision 1.2  2001/07/22 03:31:54  lampret

// Fixed RAM's oen bug. Cache bypass under development.

//

// Revision 1.1  2001/07/20 00:46:21  lampret

// Development version of RTL. Libraries are missing.

//

//

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

`include "or1200_defines.v"

module or1200_top(

        // System

        clk_i, rst_i, pic_ints_i, clmode_i,

        // Instruction WISHBONE INTERFACE

        iwb_clk_i, iwb_rst_i, iwb_ack_i, iwb_err_i, iwb_rty_i, iwb_dat_i,

        iwb_cyc_o, iwb_adr_o, iwb_stb_o, iwb_we_o, iwb_sel_o, iwb_cab_o, iwb_dat_o,

        // Data WISHBONE INTERFACE

        dwb_clk_i, dwb_rst_i, dwb_ack_i, dwb_err_i, dwb_rty_i, dwb_dat_i,

        dwb_cyc_o, dwb_adr_o, dwb_stb_o, dwb_we_o, dwb_sel_o, dwb_cab_o, dwb_dat_o,

        // External Debug Interface

        dbg_stall_i, dbg_dat_i, dbg_adr_i, dbg_op_i, dbg_ewt_i,

        dbg_lss_o, dbg_is_o, dbg_wp_o, dbg_bp_o, dbg_dat_o,

        // Power Management

        pm_cpustall_i,

        pm_clksd_o, pm_dc_gate_o, pm_ic_gate_o, pm_dmmu_gate_o,

        pm_immu_gate_o, pm_tt_gate_o, pm_cpu_gate_o, pm_wakeup_o, pm_lvolt_o

);

parameter dw = `OR1200_OPERAND_WIDTH;

parameter aw = `OR1200_OPERAND_WIDTH;

parameter ppic_ints = `OR1200_PIC_INTS;

//

// I/O

//

//

// System

//

input                   clk_i;

input                   rst_i;

input   [1:0]            clmode_i;       // 00 WB=RISC, 01 WB=RISC/2, 10 N/A, 11 WB=RISC/4

input   [ppic_ints-1:0]  pic_ints_i;

//

// Instruction WISHBONE interface

//

input                   iwb_clk_i;      // clock input

input                   iwb_rst_i;      // reset input

input                   iwb_ack_i;      // normal termination

input                   iwb_err_i;      // termination w/ error

input                   iwb_rty_i;      // termination w/ retry

input   [dw-1:0] iwb_dat_i;      // input data bus

output                  iwb_cyc_o;      // cycle valid output

output  [aw-1:0] iwb_adr_o;      // address bus outputs

output                  iwb_stb_o;      // strobe output

output                  iwb_we_o;       // indicates write transfer

output  [3:0]            iwb_sel_o;      // byte select outputs

output                  iwb_cab_o;      // indicates consecutive address burst

output  [dw-1:0] iwb_dat_o;      // output data bus

//

// Data WISHBONE interface

//

input                   dwb_clk_i;      // clock input

input                   dwb_rst_i;      // reset input

input                   dwb_ack_i;      // normal termination

input                   dwb_err_i;      // termination w/ error

input                   dwb_rty_i;      // termination w/ retry

input   [dw-1:0] dwb_dat_i;      // input data bus

output                  dwb_cyc_o;      // cycle valid output

output  [aw-1:0] dwb_adr_o;      // address bus outputs

output                  dwb_stb_o;      // strobe output

output                  dwb_we_o;       // indicates write transfer

output  [3:0]            dwb_sel_o;      // byte select outputs

output                  dwb_cab_o;      // indicates consecutive address burst

output  [dw-1:0] dwb_dat_o;      // output data bus

//

// External Debug Interface

//

input                   dbg_stall_i;    // External Stall Input

input   [dw-1:0] dbg_dat_i;      // External Data Input

input   [aw-1:0] dbg_adr_i;      // External Address Input

input   [2:0]            dbg_op_i;       // External Operation Select 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

output  [dw-1:0] dbg_dat_o;      // External Data Output

//

// Power Management

//

input                   pm_cpustall_i;

output  [3:0]            pm_clksd_o;

output                  pm_dc_gate_o;

output                  pm_ic_gate_o;

output                  pm_dmmu_gate_o;

output                  pm_immu_gate_o;

output                  pm_tt_gate_o;

output                  pm_cpu_gate_o;

output                  pm_wakeup_o;

output                  pm_lvolt_o;

//

// Internal wires and regs

//

//

// DC to BIU

//

wire    [dw-1:0] dcbiu_dat_dc;

wire    [aw-1:0] dcbiu_adr_dc;

wire                    dcbiu_cyc_dc;

wire                    dcbiu_stb_dc;

wire                    dcbiu_we_dc;

wire    [3:0]            dcbiu_sel_dc;

wire    [3:0]            dcbiu_tag_dc;

wire    [dw-1:0] dcbiu_dat_biu;

wire                    dcbiu_ack_biu;

wire                    dcbiu_err_biu;

wire    [3:0]            dcbiu_tag_biu;

//

// IC to BIU

//

wire    [dw-1:0] icbiu_dat_ic;

wire    [aw-1:0] icbiu_adr_ic;

wire                    icbiu_cyc_ic;

wire                    icbiu_stb_ic;

wire                    icbiu_we_ic;

wire    [3:0]            icbiu_sel_ic;

wire    [3:0]            icbiu_tag_ic;

wire    [dw-1:0] icbiu_dat_biu;

wire                    icbiu_ack_biu;

wire                    icbiu_err_biu;

wire    [3:0]            icbiu_tag_biu;

//

// CPU's SPR access to various RISC units (shared wires)

//

wire                    supv;

wire    [aw-1:0] spr_addr;

wire    [dw-1:0] spr_dat_cpu;

wire    [31:0]           spr_cs;

wire                    spr_we;

//

// DMMU and CPU

//

wire                    dmmu_en;

wire    [31:0]           spr_dat_dmmu;

//

// DMMU and DC

//

wire                    dcdmmu_err_dc;

wire    [3:0]            dcdmmu_tag_dc;

wire    [aw-1:0] dcdmmu_adr_dmmu;

wire                    dcdmmu_cycstb_dmmu;

wire                    dcdmmu_ci_dmmu;

//

// CPU and data memory subsystem

//

wire                    dc_en;

wire    [31:0]           dcpu_adr_cpu;

wire                    dcpu_we_cpu;

wire    [3:0]            dcpu_sel_cpu;

wire    [3:0]            dcpu_tag_cpu;

wire    [31:0]           dcpu_dat_cpu;

wire    [31:0]           dcpu_dat_dc;

wire                    dcpu_ack_dc;

wire                    dcpu_rty_dc;

wire                    dcpu_err_dmmu;

wire    [3:0]            dcpu_tag_dmmu;

//

// IMMU and CPU

//

wire                    immu_en;

wire    [31:0]           spr_dat_immu;

//

// CPU and insn memory subsystem

//

wire                    ic_en;

wire    [31:0]           icpu_adr_cpu;

wire                    icpu_cycstb_cpu;

wire                    icpu_we_cpu;

wire    [3:0]            icpu_sel_cpu;

wire    [3:0]            icpu_tag_cpu;

wire    [31:0]           icpu_dat_ic;

wire                    icpu_ack_ic;

wire    [31:0]           icpu_adr_immu;

wire                    icpu_err_immu;

wire    [3:0]            icpu_tag_immu;

//

// IMMU and IC

//

wire    [aw-1:0] icimmu_adr_immu;

wire                    icimmu_rty_ic;

wire                    icimmu_err_ic;

wire    [3:0]            icimmu_tag_ic;

wire                    icimmu_cycstb_immu;

wire                    icimmu_ci_immu;

//

// Connection between CPU and PIC

//

wire    [dw-1:0] spr_dat_pic;

wire                    pic_wakeup;

wire                    sig_int;

//

// Connection between CPU and PM

//

wire    [dw-1:0] spr_dat_pm;

//

// CPU and TT

//

wire    [dw-1:0] spr_dat_tt;

wire                    sig_tick;

//

// Debug port and caches/MMUs

//

wire    [dw-1:0] spr_dat_du;

wire                    du_stall;

wire    [dw-1:0] du_addr;

wire    [dw-1:0] du_dat_du;

wire                    du_read;

wire                    du_write;

wire    [12:0]           du_except;

wire    [`OR1200_DU_DSR_WIDTH-1:0]     du_dsr;

wire    [dw-1:0] du_dat_cpu;

wire                    ex_freeze;

wire    [31:0]           ex_insn;

wire    [`OR1200_BRANCHOP_WIDTH-1:0]     branch_op;

//

// Instantiation of Instruction WISHBONE BIU

//

or1200_wb_biu iwb_biu(

        // RISC clk, rst and clock control

        .clk(clk_i),

        .rst(rst_i),

        .clmode(clmode_i),

        // WISHBONE interface

        .wb_clk_i(iwb_clk_i),

        .wb_rst_i(iwb_rst_i),

        .wb_ack_i(iwb_ack_i),

        .wb_err_i(iwb_err_i),

        .wb_rty_i(iwb_rty_i),

        .wb_dat_i(iwb_dat_i),

        .wb_cyc_o(iwb_cyc_o),

        .wb_adr_o(iwb_adr_o),

        .wb_stb_o(iwb_stb_o),

        .wb_we_o(iwb_we_o),

        .wb_sel_o(iwb_sel_o),

        .wb_cab_o(iwb_cab_o),

        .wb_dat_o(iwb_dat_o),

        // Internal RISC bus

        .biu_dat_i(icbiu_dat_ic),

        .biu_adr_i(icbiu_adr_ic),

        .biu_cyc_i(icbiu_cyc_ic),

        .biu_stb_i(icbiu_stb_ic),

        .biu_we_i(icbiu_we_ic),

        .biu_sel_i(icbiu_sel_ic),

        .biu_cab_i(icbiu_cab_ic),

        .biu_dat_o(icbiu_dat_biu),

        .biu_ack_o(icbiu_ack_biu),

        .biu_err_o(icbiu_err_biu)

);

//

// Instantiation of Data WISHBONE BIU

//

or1200_wb_biu dwb_biu(

        // RISC clk, rst and clock control

        .clk(clk_i),

        .rst(rst_i),

        .clmode(clmode_i),

        // WISHBONE interface

        .wb_clk_i(dwb_clk_i),

        .wb_rst_i(dwb_rst_i),

        .wb_ack_i(dwb_ack_i),

        .wb_err_i(dwb_err_i),

        .wb_rty_i(dwb_rty_i),

        .wb_dat_i(dwb_dat_i),

        .wb_cyc_o(dwb_cyc_o),

        .wb_adr_o(dwb_adr_o),

        .wb_stb_o(dwb_stb_o),

        .wb_we_o(dwb_we_o),

        .wb_sel_o(dwb_sel_o),

        .wb_cab_o(dwb_cab_o),

        .wb_dat_o(dwb_dat_o),

        // Internal RISC bus

        .biu_dat_i(dcbiu_dat_dc),

        .biu_adr_i(dcbiu_adr_dc),

        .biu_cyc_i(dcbiu_cyc_dc),

        .biu_stb_i(dcbiu_stb_dc),

        .biu_we_i(dcbiu_we_dc),

        .biu_sel_i(dcbiu_sel_dc),

        .biu_cab_i(dcbiu_cab_dc),

        .biu_dat_o(dcbiu_dat_biu),

        .biu_ack_o(dcbiu_ack_biu),

        .biu_err_o(dcbiu_err_biu)

);

//

// Instantiation of IMMU

//

or1200_immu_top or1200_immu_top(

        // Rst and clk

        .clk(clk_i),

        .rst(rst_i),

        // CPU i/f

        .ic_en(ic_en),

        .immu_en(immu_en),

        .supv(supv),

        .icpu_adr_i(icpu_adr_cpu),

        .icpu_cycstb_i(icpu_cycstb_cpu),

        .icpu_adr_o(icpu_adr_immu),

        .icpu_tag_o(icpu_tag_immu),

        .icpu_rty_o(icpu_rty_immu),

        .icpu_err_o(icpu_err_immu),

        // SPR access

        .spr_cs(spr_cs[`OR1200_SPR_GROUP_IMMU]),

        .spr_write(spr_we),

        .spr_addr(spr_addr),

        .spr_dat_i(spr_dat_cpu),

        .spr_dat_o(spr_dat_immu),

        // IC i/f

        .icimmu_rty_i(icimmu_rty_ic),

        .icimmu_err_i(icimmu_err_ic),

        .icimmu_tag_i(icimmu_tag_ic),

        .icimmu_adr_o(icimmu_adr_immu),

        .icimmu_cycstb_o(icimmu_cycstb_immu),

        .icimmu_ci_o(icimmu_ci_immu)

);

//

// Instantiation of Instruction Cache

//

or1200_ic_top or1200_ic_top(

        .clk(clk_i),

        .rst(rst_i),

        // IC and CPU/IMMU

        .ic_en(ic_en),

        .icimmu_adr_i(icimmu_adr_immu),

        .icimmu_cycstb_i(icimmu_cycstb_immu),

        .icimmu_ci_i(icimmu_ci_immu),

        .icpu_we_i(icpu_we_cpu),

        .icpu_sel_i(icpu_sel_cpu),

        .icpu_tag_i(icpu_tag_cpu),

        .icpu_dat_o(icpu_dat_ic),

        .icpu_ack_o(icpu_ack_ic),

        .icimmu_rty_o(icimmu_rty_ic),

        .icimmu_err_o(icimmu_err_ic),

        .icimmu_tag_o(icimmu_tag_ic),

        // SPR access

        .spr_cs(spr_cs[`OR1200_SPR_GROUP_IC]),

        .spr_write(spr_we),

        .spr_dat_i(spr_dat_cpu),

        // IC and BIU

        .icbiu_dat_o(icbiu_dat_ic),

        .icbiu_adr_o(icbiu_adr_ic),

        .icbiu_cyc_o(icbiu_cyc_ic),

        .icbiu_stb_o(icbiu_stb_ic),

        .icbiu_we_o(icbiu_we_ic),

        .icbiu_sel_o(icbiu_sel_ic),

        .icbiu_cab_o(icbiu_cab_ic),

        .icbiu_dat_i(icbiu_dat_biu),

        .icbiu_ack_i(icbiu_ack_biu),

        .icbiu_err_i(icbiu_err_biu)

);

//

// Instantiation of Instruction Cache

//

or1200_cpu or1200_cpu(

        .clk(clk_i),

        .rst(rst_i),

        // Connection IC and IFETCHER inside CPU

        .ic_en(ic_en),

        .icpu_adr_o(icpu_adr_cpu),

        .icpu_cycstb_o(icpu_cycstb_cpu),

        .icpu_we_o(icpu_we_cpu),

        .icpu_sel_o(icpu_sel_cpu),

        .icpu_tag_o(icpu_tag_cpu),

        .icpu_dat_i(icpu_dat_ic),

        .icpu_ack_i(icpu_ack_ic),

        .icpu_rty_i(icpu_rty_immu),

        .icpu_adr_i(icpu_adr_immu),

        .icpu_err_i(icpu_err_immu),

        .icpu_tag_i(icpu_tag_immu),

        // Connection CPU to external Debug port

        .ex_freeze(ex_freeze),

        .ex_insn(ex_insn),

        .branch_op(branch_op),

        .du_stall(du_stall),

        .du_addr(du_addr),

        .du_dat_du(du_dat_du),

        .du_read(du_read),

        .du_write(du_write),

        .du_dsr(du_dsr),

        .du_except(du_except),

        .du_dat_cpu(du_dat_cpu),

        // Connection IMMU and CPU internally

        .immu_en(immu_en),

        // Connection DC and CPU

        .dc_en(dc_en),

        .dcpu_adr_o(dcpu_adr_cpu),

        .dcpu_cycstb_o(dcpu_cycstb_cpu),

        .dcpu_we_o(dcpu_we_cpu),

        .dcpu_sel_o(dcpu_sel_cpu),

        .dcpu_tag_o(dcpu_tag_cpu),

        .dcpu_dat_o(dcpu_dat_cpu),

        .dcpu_dat_i(dcpu_dat_dc),

        .dcpu_ack_i(dcpu_ack_dc),

        .dcpu_rty_i(dcpu_rty_dc),

        .dcpu_err_i(dcpu_err_dmmu),

        .dcpu_tag_i(dcpu_tag_dmmu),

        // Connection DMMU and CPU internally

        .dmmu_en(dmmu_en),

        // Connection PIC and CPU's EXCEPT

        .sig_int(sig_int),

        .sig_tick(sig_tick),

        // SPRs

        .supv(supv),

        .spr_addr(spr_addr),

        .spr_dat_cpu(spr_dat_cpu),

        .spr_dat_pic(spr_dat_pic),

        .spr_dat_tt(spr_dat_tt),

        .spr_dat_pm(spr_dat_pm),

        .spr_dat_dmmu(spr_dat_dmmu),

        .spr_dat_immu(spr_dat_immu),

        .spr_dat_du(spr_dat_du),

        .spr_cs(spr_cs),

        .spr_we(spr_we)

);

//

// Instantiation of DMMU

//

or1200_dmmu_top or1200_dmmu_top(

        // Rst and clk

        .clk(clk_i),

        .rst(rst_i),

        // CPU i/f

        .dc_en(dc_en),

        .dmmu_en(dmmu_en),

        .supv(supv),

        .dcpu_adr_i(dcpu_adr_cpu),

        .dcpu_cycstb_i(dcpu_cycstb_cpu),

        .dcpu_we_i(dcpu_we_cpu),

        .dcpu_tag_o(dcpu_tag_dmmu),

        .dcpu_err_o(dcpu_err_dmmu),

        // SPR access

        .spr_cs(spr_cs[`OR1200_SPR_GROUP_DMMU]),

        .spr_write(spr_we),

        .spr_addr(spr_addr),

        .spr_dat_i(spr_dat_cpu),

        .spr_dat_o(spr_dat_dmmu),

        // DC i/f

        .dcdmmu_err_i(dcdmmu_err_dc),

        .dcdmmu_tag_i(dcdmmu_tag_dc),

        .dcdmmu_adr_o(dcdmmu_adr_dmmu),

        .dcdmmu_cycstb_o(dcdmmu_cycstb_dmmu),

        .dcdmmu_ci_o(dcdmmu_ci_dmmu)

);

//

// Instantiation of Data Cache

//

or1200_dc_top or1200_dc_top(

        .clk(clk_i),

        .rst(rst_i),

        // DC and CPU/DMMU

        .dc_en(dc_en),

        .dcdmmu_adr_i(dcdmmu_adr_dmmu),

        .dcdmmu_cycstb_i(dcdmmu_cycstb_dmmu),

        .dcdmmu_ci_i(dcdmmu_ci_dmmu),

        .dcpu_we_i(dcpu_we_cpu),

        .dcpu_sel_i(dcpu_sel_cpu),

        .dcpu_tag_i(dcpu_tag_cpu),

        .dcpu_dat_i(dcpu_dat_cpu),

        .dcpu_dat_o(dcpu_dat_dc),

        .dcpu_ack_o(dcpu_ack_dc),

        .dcpu_rty_o(dcpu_rty_dc),

        .dcdmmu_err_o(dcdmmu_err_dc),

        .dcdmmu_tag_o(dcdmmu_tag_dc),

        // SPR access

        .spr_cs(spr_cs[`OR1200_SPR_GROUP_DC]),

        .spr_write(spr_we),

        .spr_dat_i(spr_dat_cpu),

        // DC and BIU

        .dcbiu_dat_o(dcbiu_dat_dc),

        .dcbiu_adr_o(dcbiu_adr_dc),

        .dcbiu_cyc_o(dcbiu_cyc_dc),

        .dcbiu_stb_o(dcbiu_stb_dc),

        .dcbiu_we_o(dcbiu_we_dc),

        .dcbiu_sel_o(dcbiu_sel_dc),

        .dcbiu_cab_o(dcbiu_cab_dc),

        .dcbiu_dat_i(dcbiu_dat_biu),

        .dcbiu_ack_i(dcbiu_ack_biu),

        .dcbiu_err_i(dcbiu_err_biu)

);

//

// Instantiation of Debug Unit

//

or1200_du or1200_du(

        // RISC Internal Interface

        .clk(clk_i),

        .rst(rst_i),

        .dcpu_cycstb_i(dcpu_cycstb_cpu),

        .dcpu_we_i(dcpu_we_cpu),

        .icpu_cycstb_i(icpu_cycstb_cpu),

        .ex_freeze(ex_freeze),

        .branch_op(branch_op),

        .ex_insn(ex_insn),

        .du_dsr(du_dsr),

        // DU's access to SPR unit

        .du_stall(du_stall),

        .du_addr(du_addr),

        .du_dat_i(du_dat_cpu),

        .du_dat_o(du_dat_du),

        .du_read(du_read),

        .du_write(du_write),

        .du_except(du_except),

        // Access to DU's SPRs

        .spr_cs(spr_cs[`OR1200_SPR_GROUP_DU]),

        .spr_write(spr_we),

        .spr_addr(spr_addr),

        .spr_dat_i(spr_dat_cpu),

        .spr_dat_o(spr_dat_du),

        // External Debug Interface

        .dbg_stall_i(dbg_stall_i),

        .dbg_dat_i(dbg_dat_i),

        .dbg_adr_i(dbg_adr_i),

        .dbg_op_i(dbg_op_i),

        .dbg_ewt_i(dbg_ewt_i),

        .dbg_lss_o(dbg_lss_o),

        .dbg_is_o(dbg_is_o),

        .dbg_wp_o(dbg_wp_o),

        .dbg_bp_o(dbg_bp_o),

        .dbg_dat_o(dbg_dat_o)

);

//

// Programmable interrupt controller

//

or1200_pic or1200_pic(

        // RISC Internal Interface

        .clk(clk_i),

        .rst(rst_i),

        .spr_cs(spr_cs[`OR1200_SPR_GROUP_PIC]),

        .spr_write(spr_we),

        .spr_addr(spr_addr),

        .spr_dat_i(spr_dat_cpu),

        .spr_dat_o(spr_dat_pic),

        .pic_wakeup(pic_wakeup),

        .int(sig_int),

        // PIC Interface

        .pic_int(pic_ints_i)

);

//

// Instantiation of Tick timer

//