Subversion Repositories or1200_hp

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

////                                                              ////

////  OR1200's interface to SPRs                                  ////

////                                                              ////

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

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

////                                                              ////

////  Description                                                 ////

////  Decoding of SPR addresses and access to SPRs                ////

////                                                              ////

////  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 1.9.4.1  2003/12/17 13:43:38  simons

// Exception prefix configuration changed.

//

// Revision 1.9  2002/09/07 05:42:02  lampret

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

//

// Revision 1.8  2002/08/28 01:44:25  lampret

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

//

// Revision 1.7  2002/03/29 15:16:56  lampret

// Some of the warnings fixed.

//

// Revision 1.6  2002/03/11 01:26:57  lampret

// Changed generation of SPR address. Now it is ORed from base and offset instead of a sum.

//

// Revision 1.5  2002/02/01 19:56:54  lampret

// Fixed combinational loops.

//

// Revision 1.4  2002/01/23 07:52:36  lampret

// Changed default reset values for SR and ESR to match or1ksim's. Fixed flop model in or1200_dpram_32x32 when OR1200_XILINX_RAM32X1D is defined.

//

// Revision 1.3  2002/01/19 09:27:49  lampret

// SR[TEE] should be zero after reset.

//

// 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 1.12  2001/11/23 21:42:31  simons

// Program counter divided to PPC and NPC.

//

// Revision 1.11  2001/11/23 08:38:51  lampret

// Changed DSR/DRR behavior and exception detection.

//

// Revision 1.10  2001/11/12 01:45:41  lampret

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

//

// Revision 1.9  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 1.8  2001/10/14 13:12:10  lampret

// MP3 version.

//

// Revision 1.1.1.1  2001/10/06 10:18:36  igorm

// no message

//

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

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

//

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

// Major clean-up.

//

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

// Development version of RTL. Libraries are missing.

//

//

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

`include "or1200_defines.v"

module or1200_sprs_cm2(

                clk_i_cml_1,

                // Clk & Rst

                clk, rst,

                // Internal CPU interface

                flagforw, flag_we, flag, cyforw, cy_we, carry,

                addrbase, addrofs, dat_i, alu_op, branch_op,

                epcr, eear, esr, except_started,

                to_wbmux, epcr_we, eear_we, esr_we, pc_we, sr_we, to_sr, sr,

                spr_dat_cfgr, spr_dat_rf, spr_dat_npc, spr_dat_ppc, spr_dat_mac,

                // From/to other RISC units

                spr_dat_pic, spr_dat_tt, spr_dat_pm,

                spr_dat_dmmu, spr_dat_immu, spr_dat_du,

                spr_addr, spr_dat_o, spr_cs, spr_we,

                du_addr, du_dat_du, du_read,

                du_write, du_dat_cpu

);

input clk_i_cml_1;

reg  flag_we_cml_1;

reg  cy_we_cml_1;

reg [ 32 - 1 : 0 ] dat_i_cml_1;

reg [ 3 - 1 : 0 ] branch_op_cml_1;

reg [ 32 - 1 : 0 ] epcr_cml_1;

reg [ 32 - 1 : 0 ] eear_cml_1;

reg [ 16 - 1 : 0 ] esr_cml_1;

reg  sr_we_cml_1;

reg [ 16 - 1 : 0 ] sr_cml_1;

reg [ 31 : 0 ] spr_addr_cml_1;

reg [ 31 : 0 ] spr_dat_o_cml_1;

reg [ 31 : 0 ] spr_cs_cml_1;

reg [ 32 - 1 : 0 ] du_dat_du_cml_1;

reg  du_read_cml_1;

reg  du_write_cml_1;

reg  write_spr_cml_1;

reg  read_spr_cml_1;

reg  npc_sel_cml_1;

reg  ppc_sel_cml_1;

reg  sr_sel_cml_1;

reg [ 4 - 1 : 0 ] sprs_op_cml_1;

parameter width = `OR1200_OPERAND_WIDTH;

//

// I/O Ports

//

//

// Internal CPU interface

//

input                           clk;            // Clock

input                           rst;            // Reset

input                           flagforw;       // From ALU

input                           flag_we;        // From ALU

output                          flag;           // SR[F]

input                           cyforw;         // From ALU

input                           cy_we;          // From ALU

output                          carry;          // SR[CY]

input   [width-1:0]              addrbase;       // SPR base address

input   [15:0]                   addrofs;        // SPR offset

input   [width-1:0]              dat_i;          // SPR write data

input   [`OR1200_ALUOP_WIDTH-1:0]        alu_op;         // ALU operation

input   [`OR1200_BRANCHOP_WIDTH-1:0]     branch_op;      // Branch operation

input   [width-1:0]              epcr;           // EPCR0

input   [width-1:0]              eear;           // EEAR0

input   [`OR1200_SR_WIDTH-1:0]   esr;            // ESR0

input                           except_started; // Exception was started

output  [width-1:0]              to_wbmux;       // For l.mfspr

output                          epcr_we;        // EPCR0 write enable

output                          eear_we;        // EEAR0 write enable

output                          esr_we;         // ESR0 write enable

output                          pc_we;          // PC write enable

output                          sr_we;          // Write enable SR

output  [`OR1200_SR_WIDTH-1:0]   to_sr;          // Data to SR

output  [`OR1200_SR_WIDTH-1:0]   sr;             // SR

input   [31:0]                   spr_dat_cfgr;   // Data from CFGR

input   [31:0]                   spr_dat_rf;     // Data from RF

input   [31:0]                   spr_dat_npc;    // Data from NPC

input   [31:0]                   spr_dat_ppc;    // Data from PPC   

input   [31:0]                   spr_dat_mac;    // Data from MAC

//

// To/from other RISC units

//

input   [31:0]                   spr_dat_pic;    // Data from PIC

input   [31:0]                   spr_dat_tt;     // Data from TT

input   [31:0]                   spr_dat_pm;     // Data from PM

input   [31:0]                   spr_dat_dmmu;   // Data from DMMU

input   [31:0]                   spr_dat_immu;   // Data from IMMU

input   [31:0]                   spr_dat_du;     // Data from DU

output  [31:0]                   spr_addr;       // SPR Address

output  [31:0]                   spr_dat_o;      // Data to unit

output  [31:0]                   spr_cs;         // Unit select

output                          spr_we;         // SPR write enable

//

// To/from Debug Unit

//

input   [width-1:0]              du_addr;        // Address

input   [width-1:0]              du_dat_du;      // Data from DU to SPRS

input                           du_read;        // Read qualifier

input                           du_write;       // Write qualifier

output  [width-1:0]              du_dat_cpu;     // Data from SPRS to DU

//

// Internal regs & wires

//

reg     [`OR1200_SR_WIDTH-1:0]           sr;             // SR

reg                             write_spr;      // Write SPR

reg                             read_spr;       // Read SPR

reg     [width-1:0]              to_wbmux;       // For l.mfspr

wire                            cfgr_sel;       // Select for cfg regs

wire                            rf_sel;         // Select for RF

wire                            npc_sel;        // Select for NPC

wire                            ppc_sel;        // Select for PPC

wire                            sr_sel;         // Select for SR        

wire                            epcr_sel;       // Select for EPCR0

wire                            eear_sel;       // Select for EEAR0

wire                            esr_sel;        // Select for ESR0

wire    [31:0]                   sys_data;       // Read data from system SPRs

wire                            du_access;      // Debug unit access

wire    [`OR1200_ALUOP_WIDTH-1:0]        sprs_op;        // ALU operation

reg     [31:0]                   unqualified_cs; // Unqualified chip selects

//

// Decide if it is debug unit access

//

assign du_access = du_read | du_write;

//

// Generate sprs opcode

//

assign sprs_op = du_write ? `OR1200_ALUOP_MTSR : du_read ? `OR1200_ALUOP_MFSR : alu_op;

//

// Generate SPR address from base address and offset

// OR from debug unit address

//

assign spr_addr = du_access ? du_addr : addrbase | {16'h0000, addrofs};

//

// SPR is written by debug unit or by l.mtspr

//

assign spr_dat_o = du_write ? du_dat_du : dat_i;

//

// debug unit data input:

//  - write into debug unit SPRs by debug unit itself

//  - read of SPRS by debug unit

//  - write into debug unit SPRs by l.mtspr

//

// SynEDA CoreMultiplier

// assignment(s): du_dat_cpu

// replace(s): dat_i, du_dat_du, du_read, du_write

assign du_dat_cpu = du_write_cml_1 ? du_dat_du_cml_1 : du_read_cml_1 ? to_wbmux : dat_i_cml_1;

//

// Write into SPRs when l.mtspr

//

assign spr_we = du_write | write_spr;

//

// Qualify chip selects

//

assign spr_cs = unqualified_cs & {32{read_spr | write_spr}};

//

// Decoding of groups

//

always @(spr_addr)

        case (spr_addr[`OR1200_SPR_GROUP_BITS]) // synopsys parallel_case

                `OR1200_SPR_GROUP_WIDTH'd00: unqualified_cs = 32'b00000000_00000000_00000000_00000001;

                `OR1200_SPR_GROUP_WIDTH'd01: unqualified_cs = 32'b00000000_00000000_00000000_00000010;

                `OR1200_SPR_GROUP_WIDTH'd02: unqualified_cs = 32'b00000000_00000000_00000000_00000100;

                `OR1200_SPR_GROUP_WIDTH'd03: unqualified_cs = 32'b00000000_00000000_00000000_00001000;

                `OR1200_SPR_GROUP_WIDTH'd04: unqualified_cs = 32'b00000000_00000000_00000000_00010000;

                `OR1200_SPR_GROUP_WIDTH'd05: unqualified_cs = 32'b00000000_00000000_00000000_00100000;

                `OR1200_SPR_GROUP_WIDTH'd06: unqualified_cs = 32'b00000000_00000000_00000000_01000000;

                `OR1200_SPR_GROUP_WIDTH'd07: unqualified_cs = 32'b00000000_00000000_00000000_10000000;

                `OR1200_SPR_GROUP_WIDTH'd08: unqualified_cs = 32'b00000000_00000000_00000001_00000000;

                `OR1200_SPR_GROUP_WIDTH'd09: unqualified_cs = 32'b00000000_00000000_00000010_00000000;

                `OR1200_SPR_GROUP_WIDTH'd10: unqualified_cs = 32'b00000000_00000000_00000100_00000000;

                `OR1200_SPR_GROUP_WIDTH'd11: unqualified_cs = 32'b00000000_00000000_00001000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd12: unqualified_cs = 32'b00000000_00000000_00010000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd13: unqualified_cs = 32'b00000000_00000000_00100000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd14: unqualified_cs = 32'b00000000_00000000_01000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd15: unqualified_cs = 32'b00000000_00000000_10000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd16: unqualified_cs = 32'b00000000_00000001_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd17: unqualified_cs = 32'b00000000_00000010_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd18: unqualified_cs = 32'b00000000_00000100_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd19: unqualified_cs = 32'b00000000_00001000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd20: unqualified_cs = 32'b00000000_00010000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd21: unqualified_cs = 32'b00000000_00100000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd22: unqualified_cs = 32'b00000000_01000000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd23: unqualified_cs = 32'b00000000_10000000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd24: unqualified_cs = 32'b00000001_00000000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd25: unqualified_cs = 32'b00000010_00000000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd26: unqualified_cs = 32'b00000100_00000000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd27: unqualified_cs = 32'b00001000_00000000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd28: unqualified_cs = 32'b00010000_00000000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd29: unqualified_cs = 32'b00100000_00000000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd30: unqualified_cs = 32'b01000000_00000000_00000000_00000000;

                `OR1200_SPR_GROUP_WIDTH'd31: unqualified_cs = 32'b10000000_00000000_00000000_00000000;

        endcase

//

// SPRs System Group

//

//

// What to write into SR

//

assign to_sr[`OR1200_SR_FO:`OR1200_SR_OV] =

                (branch_op_cml_1 == `OR1200_BRANCHOP_RFE) ? esr_cml_1[`OR1200_SR_FO:`OR1200_SR_OV] :

                (write_spr_cml_1 && sr_sel_cml_1) ? {1'b1, spr_dat_o_cml_1[`OR1200_SR_FO-1:`OR1200_SR_OV]}:

                sr_cml_1[`OR1200_SR_FO:`OR1200_SR_OV];

assign to_sr[`OR1200_SR_CY] =

                (branch_op_cml_1 == `OR1200_BRANCHOP_RFE) ? esr_cml_1[`OR1200_SR_CY] :

                cy_we_cml_1 ? cyforw :

                (write_spr_cml_1 && sr_sel_cml_1) ? spr_dat_o_cml_1[`OR1200_SR_CY] :

                sr_cml_1[`OR1200_SR_CY];

assign to_sr[`OR1200_SR_F] =

                (branch_op_cml_1 == `OR1200_BRANCHOP_RFE) ? esr_cml_1[`OR1200_SR_F] :

                flag_we_cml_1 ? flagforw :

                (write_spr_cml_1 && sr_sel_cml_1) ? spr_dat_o_cml_1[`OR1200_SR_F] :

                sr_cml_1[`OR1200_SR_F];

// SynEDA CoreMultiplier

// assignment(s): to_sr

// replace(s): flag_we, cy_we, branch_op, esr, sr, spr_dat_o, write_spr, sr_sel

assign to_sr[`OR1200_SR_CE:`OR1200_SR_SM] =

                (branch_op_cml_1 == `OR1200_BRANCHOP_RFE) ? esr_cml_1[`OR1200_SR_CE:`OR1200_SR_SM] :

                (write_spr_cml_1 && sr_sel_cml_1) ? spr_dat_o_cml_1[`OR1200_SR_CE:`OR1200_SR_SM]:

                sr_cml_1[`OR1200_SR_CE:`OR1200_SR_SM];

//

// Selects for system SPRs

//

// SynEDA CoreMultiplier

// assignment(s): cfgr_sel

// replace(s): spr_addr, spr_cs

assign cfgr_sel = (spr_cs_cml_1[`OR1200_SPR_GROUP_SYS] && (spr_addr_cml_1[10:4] == `OR1200_SPR_CFGR));

// SynEDA CoreMultiplier

// assignment(s): rf_sel

// replace(s): spr_addr, spr_cs

assign rf_sel = (spr_cs_cml_1[`OR1200_SPR_GROUP_SYS] && (spr_addr_cml_1[10:5] == `OR1200_SPR_RF));

assign npc_sel = (spr_cs[`OR1200_SPR_GROUP_SYS] && (spr_addr[10:0] == `OR1200_SPR_NPC));

assign ppc_sel = (spr_cs[`OR1200_SPR_GROUP_SYS] && (spr_addr[10:0] == `OR1200_SPR_PPC));

assign sr_sel = (spr_cs[`OR1200_SPR_GROUP_SYS] && (spr_addr[10:0] == `OR1200_SPR_SR));

// SynEDA CoreMultiplier

// assignment(s): epcr_sel

// replace(s): spr_addr, spr_cs

assign epcr_sel = (spr_cs_cml_1[`OR1200_SPR_GROUP_SYS] && (spr_addr_cml_1[10:0] == `OR1200_SPR_EPCR));

// SynEDA CoreMultiplier

// assignment(s): eear_sel

// replace(s): spr_addr, spr_cs

assign eear_sel = (spr_cs_cml_1[`OR1200_SPR_GROUP_SYS] && (spr_addr_cml_1[10:0] == `OR1200_SPR_EEAR));

// SynEDA CoreMultiplier

// assignment(s): esr_sel

// replace(s): spr_addr, spr_cs

assign esr_sel = (spr_cs_cml_1[`OR1200_SPR_GROUP_SYS] && (spr_addr_cml_1[10:0] == `OR1200_SPR_ESR));

//

// Write enables for system SPRs

//

assign sr_we = (write_spr && sr_sel) | (branch_op == `OR1200_BRANCHOP_RFE) | flag_we | cy_we;

assign pc_we = (write_spr && (npc_sel | ppc_sel));

// SynEDA CoreMultiplier

// assignment(s): epcr_we

// replace(s): write_spr

assign epcr_we = (write_spr_cml_1 && epcr_sel);

// SynEDA CoreMultiplier

// assignment(s): eear_we

// replace(s): write_spr

assign eear_we = (write_spr_cml_1 && eear_sel);

// SynEDA CoreMultiplier

// assignment(s): esr_we

// replace(s): write_spr

assign esr_we = (write_spr_cml_1 && esr_sel);

//

// Output from system SPRs

//

//assign sys_data = (spr_dat_cfgr & {32{read_spr & cfgr_sel}}) |

//                (spr_dat_rf & {32{read_spr & rf_sel}}) |

//                (spr_dat_npc & {32{read_spr & npc_sel}}) |

//                (spr_dat_ppc & {32{read_spr & ppc_sel}}) |

//                ({{32-`OR1200_SR_WIDTH{1'b0}},sr} & {32{read_spr & sr_sel}}) |

//                (epcr & {32{read_spr & epcr_sel}}) |

//                (eear & {32{read_spr & eear_sel}}) |

//                ({{32-`OR1200_SR_WIDTH{1'b0}},esr} & {32{read_spr & esr_sel}});

wire [31:0] read_spr_cfgr_sel_32;

wire [31:0] read_spr_rf_sel_32;

wire [31:0] read_spr_npc_sel_32;

wire [31:0] read_spr_ppc_sel_32;

wire [31:0] read_spr_sr_sel_32;

wire [31:0] read_spr_epcr_sel_32;

wire [31:0] read_spr_eear_sel_32;

wire [31:0] read_spr_esr_sel_32;

wire [31:0] sr_32;

wire [31:0] esr_32;

// SynEDA CoreMultiplier

// assignment(s): read_spr_cfgr_sel_32

// replace(s): read_spr

assign read_spr_cfgr_sel_32 = {32{read_spr_cml_1 & cfgr_sel}};

// SynEDA CoreMultiplier

// assignment(s): read_spr_rf_sel_32

// replace(s): read_spr

assign read_spr_rf_sel_32 = {32{read_spr_cml_1 & rf_sel}};

// SynEDA CoreMultiplier

// assignment(s): read_spr_npc_sel_32

// replace(s): read_spr, npc_sel

assign read_spr_npc_sel_32 = {32{read_spr_cml_1 & npc_sel_cml_1}};

// SynEDA CoreMultiplier

// assignment(s): read_spr_ppc_sel_32

// replace(s): read_spr, ppc_sel

assign read_spr_ppc_sel_32 = {32{read_spr_cml_1 & ppc_sel_cml_1}};

// SynEDA CoreMultiplier

// assignment(s): read_spr_sr_sel_32

// replace(s): read_spr, sr_sel

assign read_spr_sr_sel_32 = {32{read_spr_cml_1 & sr_sel_cml_1}};

// SynEDA CoreMultiplier

// assignment(s): read_spr_epcr_sel_32

// replace(s): read_spr

assign read_spr_epcr_sel_32 = {32{read_spr_cml_1 & epcr_sel}};

// SynEDA CoreMultiplier

// assignment(s): read_spr_eear_sel_32

// replace(s): read_spr

assign read_spr_eear_sel_32 = {32{read_spr_cml_1 & eear_sel}};

// SynEDA CoreMultiplier

// assignment(s): read_spr_esr_sel_32

// replace(s): read_spr

assign read_spr_esr_sel_32 = {32{read_spr_cml_1 & esr_sel}};

// SynEDA CoreMultiplier

// assignment(s): sr_32

// replace(s): sr

assign sr_32 = {{32-`OR1200_SR_WIDTH{1'b0}},sr_cml_1};

// SynEDA CoreMultiplier

// assignment(s): esr_32

// replace(s): esr

assign esr_32 = {{32-`OR1200_SR_WIDTH{1'b0}},esr_cml_1};

// SynEDA CoreMultiplier

// assignment(s): sys_data

// replace(s): epcr, eear

assign sys_data = (spr_dat_cfgr & read_spr_cfgr_sel_32) |

                  (spr_dat_rf & read_spr_rf_sel_32) |

                  (spr_dat_npc & read_spr_npc_sel_32) |

                  (spr_dat_ppc & read_spr_ppc_sel_32) |

                  (sr_32 & read_spr_sr_sel_32) |

                  (epcr_cml_1 & read_spr_epcr_sel_32) |

                  (eear_cml_1 & read_spr_eear_sel_32) |

                  (esr_32 & read_spr_esr_sel_32);

//

// Flag alias

//

assign flag = sr[`OR1200_SR_F];

//

// Carry alias

//

assign carry = sr[`OR1200_SR_CY];

//

// Supervision register

//

// SynEDA CoreMultiplier

// assignment(s): sr

// replace(s): sr_we, sr

always @(posedge clk or posedge rst)

        if (rst)

                sr <= #1 {1'b1, `OR1200_SR_EPH_DEF, {`OR1200_SR_WIDTH-3{1'b0}}, 1'b1};

        else begin  sr <= sr_cml_1; if (except_started) begin

                sr[`OR1200_SR_SM]  <= #1 1'b1;

                sr[`OR1200_SR_TEE] <= #1 1'b0;

                sr[`OR1200_SR_IEE] <= #1 1'b0;

                sr[`OR1200_SR_DME] <= #1 1'b0;

                sr[`OR1200_SR_IME] <= #1 1'b0;

        end

        else if (sr_we_cml_1)

                sr <= #1 to_sr[`OR1200_SR_WIDTH-1:0]; end

//

// MTSPR/MFSPR interface

//

always @(sprs_op or spr_addr or sys_data or spr_dat_mac or spr_dat_pic or spr_dat_pm or

        spr_dat_dmmu or spr_dat_immu or spr_dat_du or spr_dat_tt) begin

        case (sprs_op)  // synopsys parallel_case

                `OR1200_ALUOP_MTSR : begin

                        write_spr = 1'b1;

                end

                `OR1200_ALUOP_MFSR : begin

                        write_spr = 1'b0;

                end

                default : begin

                        write_spr = 1'b0;

                end

        endcase

end

always @(sprs_op or spr_addr or sys_data or spr_dat_mac or spr_dat_pic or spr_dat_pm or

        spr_dat_dmmu or spr_dat_immu or spr_dat_du or spr_dat_tt) begin

        case (sprs_op)  // synopsys parallel_case

                `OR1200_ALUOP_MTSR : begin

                        read_spr = 1'b0;

                end

                `OR1200_ALUOP_MFSR : begin

                        read_spr = 1'b1;

                end

                default : begin

                        read_spr = 1'b0;

                end

        endcase

end

// SynEDA CoreMultiplier

// assignment(s): to_wbmux

// replace(s): spr_addr, sprs_op

always @(sprs_op_cml_1 or spr_addr_cml_1 or sys_data or spr_dat_mac or spr_dat_pic or spr_dat_pm or

        spr_dat_dmmu or spr_dat_immu or spr_dat_du or spr_dat_tt) begin

        case (sprs_op_cml_1)    // synopsys parallel_case

                `OR1200_ALUOP_MTSR : begin

                        to_wbmux = 32'b0;

                end

                `OR1200_ALUOP_MFSR : begin

                        casex (spr_addr_cml_1[`OR1200_SPR_GROUP_BITS]) // synopsys parallel_case

                                `OR1200_SPR_GROUP_TT:

                                        to_wbmux = spr_dat_tt;

                                `OR1200_SPR_GROUP_PIC:

                                        to_wbmux = spr_dat_pic;

                                `OR1200_SPR_GROUP_PM:

                                        to_wbmux = spr_dat_pm;

                                `OR1200_SPR_GROUP_DMMU:

                                        to_wbmux = spr_dat_dmmu;

                                `OR1200_SPR_GROUP_IMMU:

                                        to_wbmux = spr_dat_immu;

                                `OR1200_SPR_GROUP_MAC:

                                        to_wbmux = spr_dat_mac;

                                `OR1200_SPR_GROUP_DU:

                                        to_wbmux = spr_dat_du;

                                `OR1200_SPR_GROUP_SYS:

                                        to_wbmux = sys_data;

                                default:

                                        to_wbmux = 32'b0;

                        endcase

                end

                default : begin

                        to_wbmux = 32'b0;

                end

        endcase

end

always @ (posedge clk_i_cml_1) begin

flag_we_cml_1 <= flag_we;

cy_we_cml_1 <= cy_we;

dat_i_cml_1 <= dat_i;

branch_op_cml_1 <= branch_op;

epcr_cml_1 <= epcr;

eear_cml_1 <= eear;

esr_cml_1 <= esr;

sr_we_cml_1 <= sr_we;

sr_cml_1 <= sr;

spr_addr_cml_1 <= spr_addr;

spr_dat_o_cml_1 <= spr_dat_o;

spr_cs_cml_1 <= spr_cs;

du_dat_du_cml_1 <= du_dat_du;

du_read_cml_1 <= du_read;

du_write_cml_1 <= du_write;

write_spr_cml_1 <= write_spr;

read_spr_cml_1 <= read_spr;

npc_sel_cml_1 <= npc_sel;

ppc_sel_cml_1 <= ppc_sel;

sr_sel_cml_1 <= sr_sel;

sprs_op_cml_1 <= sprs_op;

end

endmodule