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

////                                                              ////

////  OR1200's Data TLB                                           ////

////                                                              ////

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

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

////                                                              ////

////  Description                                                 ////

////  Instantiation of DTLB.                                      ////

////                                                              ////

////  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 1.6  2004/04/05 08:29:57  lampret

// Merged branch_qmem into main tree.

//

// Revision 1.4.4.1  2003/12/09 11:46:48  simons

// Mbist nameing changed, Artisan ram instance signal names fixed, some synthesis waning fixed.

//

// Revision 1.4  2002/10/17 20:04:40  lampret

// Added BIST scan. Special VS RAMs need to be used to implement BIST.

//

// Revision 1.3  2002/02/11 04:33:17  lampret

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

//

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

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

//

// Revision 1.8  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 1.7  2001/10/14 13:12:09  lampret

// MP3 version.

//

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

// no message

//

//

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

`include "or1200_defines.v"

//

// Data TLB

//

module or1200_dmmu_tlb_cm2(

                clk_i_cml_1,

                cmls,

        // Rst and clk

        clk, rst,

        // I/F for translation

        tlb_en, vaddr, hit, ppn, uwe, ure, swe, sre, ci,

`ifdef OR1200_BIST

        // RAM BIST

        mbist_si_i, mbist_so_o, mbist_ctrl_i,

`endif

        // SPR access

        spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o

);

input clk_i_cml_1;

input cmls;

reg  spr_cs_cml_1;

reg  spr_write_cml_1;

reg [ 31 : 0 ] spr_addr_cml_1;

reg [ 31 : 0 ] spr_dat_i_cml_1;

reg [ 6 - 1 : 0 ] tlb_index_cml_1;

parameter dw = `OR1200_OPERAND_WIDTH;

parameter aw = `OR1200_OPERAND_WIDTH;

//

// I/O

//

//

// Clock and reset

//

input                           clk;

input                           rst;

//

// I/F for translation

//

input                           tlb_en;

input   [aw-1:0]         vaddr;

output                          hit;

output  [31:`OR1200_DMMU_PS]    ppn;

output                          uwe;

output                          ure;

output                          swe;

output                          sre;

output                          ci;

`ifdef OR1200_BIST

//

// RAM BIST

//

input mbist_si_i;

input [`OR1200_MBIST_CTRL_WIDTH - 1:0] mbist_ctrl_i;

output mbist_so_o;

`endif

//

// SPR access

//

input                           spr_cs;

input                           spr_write;

input   [31:0]                   spr_addr;

input   [31:0]                   spr_dat_i;

output  [31:0]                   spr_dat_o;

//

// Internal wires and regs

//

wire    [`OR1200_DTLB_TAG]      vpn;

wire                            v;

wire    [`OR1200_DTLB_INDXW-1:0] tlb_index;

wire                            tlb_mr_en;

wire                            tlb_mr_we;

wire    [`OR1200_DTLBMRW-1:0]    tlb_mr_ram_in;

wire    [`OR1200_DTLBMRW-1:0]    tlb_mr_ram_out;

wire                            tlb_tr_en;

wire                            tlb_tr_we;

wire    [`OR1200_DTLBTRW-1:0]    tlb_tr_ram_in;

wire    [`OR1200_DTLBTRW-1:0]    tlb_tr_ram_out;

`ifdef OR1200_BIST

//

// RAM BIST

//

wire                            mbist_mr_so;

wire                            mbist_tr_so;

wire                            mbist_mr_si = mbist_si_i;

wire                            mbist_tr_si = mbist_mr_so;

assign                          mbist_so_o = mbist_tr_so;

`endif

//

// Implemented bits inside match and translate registers

//

// dtlbwYmrX: vpn 31-19  v 0

// dtlbwYtrX: ppn 31-13  swe 9  sre 8  uwe 7  ure 6

//

// dtlb memory width:

// 19 bits for ppn

// 13 bits for vpn

// 1 bit for valid

// 4 bits for protection

// 1 bit for cache inhibit

//

// Enable for Match registers

//

// SynEDA CoreMultiplier

// assignment(s): tlb_mr_en

// replace(s): spr_cs, spr_addr

assign tlb_mr_en = tlb_en | (spr_cs_cml_1 & !spr_addr_cml_1[`OR1200_DTLB_TM_ADDR]);

//

// Write enable for Match registers

//

// SynEDA CoreMultiplier

// assignment(s): tlb_mr_we

// replace(s): spr_cs, spr_write, spr_addr

assign tlb_mr_we = spr_cs_cml_1 & spr_write_cml_1 & !spr_addr_cml_1[`OR1200_DTLB_TM_ADDR];

//

// Enable for Translate registers

//

// SynEDA CoreMultiplier

// assignment(s): tlb_tr_en

// replace(s): spr_cs, spr_addr

assign tlb_tr_en = tlb_en | (spr_cs_cml_1 & spr_addr_cml_1[`OR1200_DTLB_TM_ADDR]);

//

// Write enable for Translate registers

//

// SynEDA CoreMultiplier

// assignment(s): tlb_tr_we

// replace(s): spr_cs, spr_write, spr_addr

assign tlb_tr_we = spr_cs_cml_1 & spr_write_cml_1 & spr_addr_cml_1[`OR1200_DTLB_TM_ADDR];

//

// Output to SPRS unit

//

assign spr_dat_o = (spr_cs & !spr_write & !spr_addr[`OR1200_DTLB_TM_ADDR]) ?

                        {vpn, tlb_index & {`OR1200_DTLB_INDXW{v}}, {`OR1200_DTLB_TAGW-7{1'b0}}, 1'b0, 5'b00000, v} :

                (spr_cs & !spr_write & spr_addr[`OR1200_DTLB_TM_ADDR]) ?

                        {ppn, {`OR1200_DMMU_PS-10{1'b0}}, swe, sre, uwe, ure, {4{1'b0}}, ci, 1'b0} :

                        32'h00000000;

//

// Assign outputs from Match registers

//

//assign {vpn, v} = tlb_mr_ram_out;

assign vpn = tlb_mr_ram_out[13:1];

assign v = tlb_mr_ram_out[0];

//

// Assign to Match registers inputs

//

// SynEDA CoreMultiplier

// assignment(s): tlb_mr_ram_in

// replace(s): spr_dat_i

assign tlb_mr_ram_in = {spr_dat_i_cml_1[`OR1200_DTLB_TAG], spr_dat_i_cml_1[`OR1200_DTLBMR_V_BITS]};

//

// Assign outputs from Translate registers

//

//assign {ppn, swe, sre, uwe, ure, ci} = tlb_tr_ram_out;

assign ppn = tlb_tr_ram_out[23:5];

assign swe = tlb_tr_ram_out[4];

assign sre = tlb_tr_ram_out[3];

assign uwe = tlb_tr_ram_out[2];

assign ure = tlb_tr_ram_out[1];

assign ci = tlb_tr_ram_out[0];

//

// Assign to Translate registers inputs

//

// SynEDA CoreMultiplier

// assignment(s): tlb_tr_ram_in

// replace(s): spr_dat_i

assign tlb_tr_ram_in = {spr_dat_i_cml_1[31:`OR1200_DMMU_PS],

                        spr_dat_i_cml_1[`OR1200_DTLBTR_SWE_BITS],

                        spr_dat_i_cml_1[`OR1200_DTLBTR_SRE_BITS],

                        spr_dat_i_cml_1[`OR1200_DTLBTR_UWE_BITS],

                        spr_dat_i_cml_1[`OR1200_DTLBTR_URE_BITS],

                        spr_dat_i_cml_1[`OR1200_DTLBTR_CI_BITS]};

//

// Generate hit

//

assign hit = (vpn == vaddr[`OR1200_DTLB_TAG]) & v;

//

// TLB index is normally vaddr[18:13]. If it is SPR access then index is

// spr_addr[5:0].

//

assign tlb_index = spr_cs ? spr_addr[`OR1200_DTLB_INDXW-1:0] : vaddr[`OR1200_DTLB_INDX];

`ifdef OR1200_RAM_MODELS_VIRTEX

//

//      Non-generic FPGA model instantiations

//

wire tlb_mr_en_wire;

wire [0 : 0] tlb_mr_we_wire;

wire [5 : 0] tlb_index_wire;

wire [13 : 0] tlb_mr_ram_in_wire;

assign tlb_mr_en_wire = tlb_mr_en;

assign tlb_mr_we_wire = tlb_mr_we;

// SynEDA CoreMultiplier

// assignment(s): tlb_index_wire

// replace(s): tlb_index

assign tlb_index_wire = tlb_index_cml_1;

assign tlb_mr_ram_in_wire = tlb_mr_ram_in;

dtlb_mr_sub_cm2 dtlb_ram (

                .clk_i_cml_1(clk_i_cml_1),

                .cmls(cmls),

        .clka(clk),

        .ena(tlb_mr_en_wire),

        .wea(tlb_mr_we_wire), // Bus [0 : 0] 

        .addra(tlb_index_wire), // Bus [5 : 0] 

        .dina(tlb_mr_ram_in_wire), // Bus [13 : 0] 

        .clkb(clk),

        .addrb(tlb_index_wire),

        .doutb(tlb_mr_ram_out)); // Bus [13 : 0]

wire tlb_tr_en_wire;

wire [0 : 0] tlb_tr_we_wire;

wire [23 : 0] tlb_tr_ram_in_wire;

assign tlb_tr_en_wire = tlb_tr_en;

assign tlb_tr_we_wire = tlb_tr_we;

assign tlb_tr_ram_in_wire = tlb_tr_ram_in;

dtlb_tr_sub_cm2 dtlb_tr_ram (

                .clk_i_cml_1(clk_i_cml_1),

                .cmls(cmls),

        .clka(clk),

        .ena(tlb_tr_en_wire),

        .wea(tlb_tr_we_wire), // Bus [0 : 0] 

        .addra(tlb_index_wire), // Bus [5 : 0] 

        .dina(tlb_tr_ram_in_wire), // Bus [23 : 0] 

        .clkb(clk),

        .addrb(tlb_index_wire),

        .doutb(tlb_tr_ram_out)); // Bus [23 : 0] 

`else

//

// Instantiation of DTLB Match Registers

//

or1200_spram_64x14 dtlb_mr_ram(

        .clk(clk),

        .rst(rst),

`ifdef OR1200_BIST

        // RAM BIST

        .mbist_si_i(mbist_mr_si),

        .mbist_so_o(mbist_mr_so),

        .mbist_ctrl_i(mbist_ctrl_i),

`endif

        .ce(tlb_mr_en),

        .we(tlb_mr_we),

        .oe(1'b1),

        .addr(tlb_index),

        .di(tlb_mr_ram_in),

        .doq(tlb_mr_ram_out)

);

//

// Instantiation of DTLB Translate Registers

//

or1200_spram_64x24 dtlb_tr_ram(

        .clk(clk),

        .rst(rst),

`ifdef OR1200_BIST

        // RAM BIST

        .mbist_si_i(mbist_tr_si),

        .mbist_so_o(mbist_tr_so),

        .mbist_ctrl_i(mbist_ctrl_i),

`endif

        .ce(tlb_tr_en),

        .we(tlb_tr_we),

        .oe(1'b1),

        .addr(tlb_index),

        .di(tlb_tr_ram_in),

        .doq(tlb_tr_ram_out)

);

`endif

always @ (posedge clk_i_cml_1) begin

spr_cs_cml_1 <= spr_cs;

spr_write_cml_1 <= spr_write;

spr_addr_cml_1 <= spr_addr;

spr_dat_i_cml_1 <= spr_dat_i;

tlb_index_cml_1 <= tlb_index;

end

endmodule