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

////                                                              ////

////  Generic Double-Port Synchronous RAM                         ////

////                                                              ////

////  This file is part of memory library available from          ////

////  http://www.opencores.org/cvsweb.shtml/generic_memories/     ////

////                                                              ////

////  Description                                                 ////

////  This block is a wrapper with common double-port             ////

////  synchronous memory interface for different                  ////

////  types of ASIC and FPGA RAMs. Beside universal memory        ////

////  interface it also provides behavioral model of generic      ////

////  double-port synchronous RAM.                                ////

////  It should be used in all OPENCORES designs that want to be  ////

////  portable accross different target technologies and          ////

////  independent of target memory.                               ////

////                                                              ////

////  Supported ASIC RAMs are:                                    ////

////  - Artisan Double-Port Sync RAM                              ////

////  - Avant! Two-Port Sync RAM (*)                              ////

////  - Virage 2-port Sync RAM                                    ////

////                                                              ////

////  Supported FPGA RAMs are:                                    ////

////  - Xilinx Virtex RAMB4_S16_S16                               ////

////  - Altera LPM                                                ////

////                                                              ////

////  To Do:                                                      ////

////   - fix Avant!                                               ////

////   - xilinx rams need external tri-state logic                ////

////   - add additional RAMs                                      ////

////                                                              ////

////  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  2004/06/08 18:15:48  lampret

// Changed behavior of the simulation generic models

//

// Revision 1.8  2004/04/05 08:29:57  lampret

// Merged branch_qmem into main tree.

//

// Revision 1.7.4.1  2003/07/08 15:36:37  lampret

// Added embedded memory QMEM.

//

// Revision 1.7  2003/04/07 01:19:07  lampret

// Added Altera LPM RAMs. Changed generic RAM output when OE inactive.

//

// Revision 1.6  2002/03/28 19:25:42  lampret

// Added second type of Virtual Silicon two-port SRAM (for register file). Changed defines for VS STP RAMs.

//

// 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 14:10:22  lampret

// Fixed OR1200_XILINX_RAM32X1D.

//

// Revision 1.2  2002/01/15 06:12:22  lampret

// Fixed module name when compiling with OR1200_XILINX_RAM32X1D

//

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

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

//

// Revision 1.10  2001/11/05 14:48:00  lampret

// Added missing endif

//

// Revision 1.9  2001/11/02 18:57:14  lampret

// Modified virtual silicon instantiations.

//

// Revision 1.8  2001/10/22 19:39:56  lampret

// Fixed parameters in generic sprams.

//

// Revision 1.7  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 1.6  2001/10/14 13:12:09  lampret

// MP3 version.

//

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

// no message

//

// Revision 1.1  2001/08/09 13:39:33  lampret

// Major clean-up.

//

// Revision 1.2  2001/07/30 05:38:02  lampret

// Adding empty directories required by HDL coding guidelines

//

//

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

`include "or1200_defines.v"

module or1200_dpram_32x32(

        // Generic synchronous double-port RAM interface

        clk_a, rst_a, ce_a, oe_a, addr_a, do_a,

        clk_b, rst_b, ce_b, we_b, addr_b, di_b

);

//

// Default address and data buses width

//

parameter aw = 5;

parameter dw = 32;

//

// Generic synchronous double-port RAM interface

//

input                   clk_a;  // Clock

input                   rst_a;  // Reset

input                   ce_a;   // Chip enable input

input                   oe_a;   // Output enable input

input   [aw-1:0] addr_a; // address bus inputs

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

input                   clk_b;  // Clock

input                   rst_b;  // Reset

input                   ce_b;   // Chip enable input

input                   we_b;   // Write enable input

input   [aw-1:0] addr_b; // address bus inputs

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

//

// Internal wires and registers

//

`ifdef OR1200_ARTISAN_SDP

//

// Instantiation of ASIC memory:

//

// Artisan Synchronous Double-Port RAM (ra2sh)

//

`ifdef UNUSED

art_hsdp_32x32 #(dw, 1<<aw, aw) artisan_sdp(

`else

art_hsdp_32x32 artisan_sdp(

`endif

        .qa(do_a),

        .clka(clk_a),

        .cena(~ce_a),

        .wena(1'b1),

        .aa(addr_a),

        .da(32'h00000000),

        .oena(~oe_a),

        .qb(),

        .clkb(clk_b),

        .cenb(~ce_b),

        .wenb(~we_b),

        .ab(addr_b),

        .db(di_b),

        .oenb(1'b1)

);

`else

`ifdef OR1200_AVANT_ATP

//

// Instantiation of ASIC memory:

//

// Avant! Asynchronous Two-Port RAM

//

avant_atp avant_atp(

        .web(~we),

        .reb(),

        .oeb(~oe),

        .rcsb(),

        .wcsb(),

        .ra(addr),

        .wa(addr),

        .di(di),

        .doq(doq)

);

`else

`ifdef OR1200_VIRAGE_STP

//

// Instantiation of ASIC memory:

//

// Virage Synchronous 2-port R/W RAM

//

virage_stp virage_stp(

        .QA(do_a),

        .QB(),

        .ADRA(addr_a),

        .DA(32'h00000000),

        .WEA(1'b0),

        .OEA(oe_a),

        .MEA(ce_a),

        .CLKA(clk_a),

        .ADRB(addr_b),

        .DB(di_b),

        .WEB(we_b),

        .OEB(1'b1),

        .MEB(ce_b),

        .CLKB(clk_b)

);

`else

`ifdef OR1200_VIRTUALSILICON_STP_T1

//

// Instantiation of ASIC memory:

//

// Virtual Silicon Two-port R/W SRAM Type 1

//

`ifdef UNUSED

vs_hdtp_64x32 #(1<<aw, aw-1, dw-1) vs_ssp(

`else

vs_hdtp_64x32 vs_ssp(

`endif

        .P1CK(clk_a),

        .P1CEN(~ce_a),

        .P1WEN(1'b1),

        .P1OEN(~oe_a),

        .P1ADR({1'b0, addr_a}),

        .P1DI(32'h0000_0000),

        .P1DOUT(do_a),

        .P2CK(clk_b),

        .P2CEN(~ce_b),

        .P2WEN(~ce_b),

        .P2OEN(1'b1),

        .P2ADR({1'b0, addr_b}),

        .P2DI(di_b),

        .P2DOUT()

);

`else

`ifdef OR1200_VIRTUALSILICON_STP_T2

//

// Instantiation of ASIC memory:

//

// Virtual Silicon Two-port R/W SRAM Type 2

//

`ifdef UNUSED

vs_hdtp_32x32 #(1<<aw, aw-1, dw-1) vs_ssp(

`else

vs_hdtp_32x32 vs_ssp(

`endif

        .RCK(clk_a),

        .REN(~ce_a),

        .OEN(~oe_a),

        .RADR(addr_a),

        .DOUT(do_a),

        .WCK(clk_b),

        .WEN(~ce_b),

        .WADR(addr_b),

        .DI(di_b)

);

`else

`ifdef OR1200_XILINX_RAM32X1D

//

// Instantiation of FPGA memory:

//

// Virtex/Spartan2

//

reg     [4:0]    addr_a_r;

always @(posedge clk_a or posedge rst_a)

        if (rst_a)

                addr_a_r <= #1 5'b00000;

        else if (ce_a)

                addr_a_r <= #1 addr_a;

//

// Block 0

//

or1200_xcv_ram32x8d xcv_ram32x8d_0 (

        .DPO(do_a[7:0]),

        .SPO(),

        .A(addr_b),

        .D(di_b[7:0]),

        .DPRA(addr_a_r),

        .WCLK(clk_b),

        .WE(we_b)

);

//

// Block 1

//

or1200_xcv_ram32x8d xcv_ram32x8d_1 (

        .DPO(do_a[15:8]),

        .SPO(),

        .A(addr_b),

        .D(di_b[15:8]),

        .DPRA(addr_a_r),

        .WCLK(clk_b),

        .WE(we_b)

);

//

// Block 2

//

or1200_xcv_ram32x8d xcv_ram32x8d_2 (

        .DPO(do_a[23:16]),

        .SPO(),

        .A(addr_b),

        .D(di_b[23:16]),

        .DPRA(addr_a_r),

        .WCLK(clk_b),

        .WE(we_b)

);

//

// Block 3

//

or1200_xcv_ram32x8d xcv_ram32x8d_3 (

        .DPO(do_a[31:24]),

        .SPO(),

        .A(addr_b),

        .D(di_b[31:24]),

        .DPRA(addr_a_r),

        .WCLK(clk_b),

        .WE(we_b)

);

`else

`ifdef OR1200_XILINX_RAMB4

//

// Instantiation of FPGA memory:

//

// Virtex/Spartan2

//

//

// Block 0

//

RAMB4_S16_S16 ramb4_s16_0(

        .CLKA(clk_a),

        .RSTA(rst_a),

        .ADDRA({3'b000, addr_a}),

        .DIA(16'h0000),

        .ENA(ce_a),

        .WEA(1'b0),

        .DOA(do_a[15:0]),

        .CLKB(clk_b),

        .RSTB(rst_b),

        .ADDRB({3'b000, addr_b}),

        .DIB(di_b[15:0]),

        .ENB(ce_b),

        .WEB(we_b),

        .DOB()

);

//

// Block 1

//

RAMB4_S16_S16 ramb4_s16_1(

        .CLKA(clk_a),

        .RSTA(rst_a),

        .ADDRA({3'b000, addr_a}),

        .DIA(16'h0000),

        .ENA(ce_a),

        .WEA(1'b0),

        .DOA(do_a[31:16]),

        .CLKB(clk_b),

        .RSTB(rst_b),

        .ADDRB({3'b000, addr_b}),

        .DIB(di_b[31:16]),

        .ENB(ce_b),

        .WEB(we_b),

        .DOB()

);

`else

`ifdef OR1200_ALTERA_LPM_XXX

//

// Instantiation of FPGA memory:

//

// Altera LPM

//

// Added By Jamil Khatib

//

altqpram altqpram_component (

        .wraddress_a (addr_a),

        .inclocken_a (ce_a),

        .wraddress_b (addr_b),

        .wren_a (we_a),

        .inclocken_b (ce_b),

        .wren_b (we_b),

        .inaclr_a (rst_a),

        .inaclr_b (rst_b),

        .inclock_a (clk_a),

        .inclock_b (clk_b),

        .data_a (di_a),

        .data_b (di_b),

        .q_a (do_a),

        .q_b (do_b)

);

defparam altqpram_component.operation_mode = "BIDIR_DUAL_PORT",

        altqpram_component.width_write_a = dw,

        altqpram_component.widthad_write_a = aw,

        altqpram_component.numwords_write_a = dw,

        altqpram_component.width_read_a = dw,

        altqpram_component.widthad_read_a = aw,

        altqpram_component.numwords_read_a = dw,

        altqpram_component.width_write_b = dw,

        altqpram_component.widthad_write_b = aw,

        altqpram_component.numwords_write_b = dw,

        altqpram_component.width_read_b = dw,

        altqpram_component.widthad_read_b = aw,

        altqpram_component.numwords_read_b = dw,

        altqpram_component.indata_reg_a = "INCLOCK_A",

        altqpram_component.wrcontrol_wraddress_reg_a = "INCLOCK_A",

        altqpram_component.outdata_reg_a = "INCLOCK_A",

        altqpram_component.indata_reg_b = "INCLOCK_B",

        altqpram_component.wrcontrol_wraddress_reg_b = "INCLOCK_B",

        altqpram_component.outdata_reg_b = "INCLOCK_B",

        altqpram_component.indata_aclr_a = "INACLR_A",

        altqpram_component.wraddress_aclr_a = "INACLR_A",

        altqpram_component.wrcontrol_aclr_a = "INACLR_A",

        altqpram_component.outdata_aclr_a = "INACLR_A",

        altqpram_component.indata_aclr_b = "NONE",

        altqpram_component.wraddress_aclr_b = "NONE",

        altqpram_component.wrcontrol_aclr_b = "NONE",

        altqpram_component.outdata_aclr_b = "INACLR_B",

        altqpram_component.lpm_hint = "USE_ESB=ON";

        //examplar attribute altqpram_component NOOPT TRUE

`else

//

// Generic double-port synchronous RAM model

//

//

// Generic RAM's registers and wires

//

reg     [dw-1:0] mem [(1<<aw)-1:0];       // RAM content

reg     [aw-1:0] addr_a_reg;             // RAM address registered

//

// Data output drivers

//

assign do_a = (oe_a) ? mem[addr_a_reg] : {dw{1'b0}};

//

// RAM read

//

always @(posedge clk_a or posedge rst_a)

        if (rst_a)

                addr_a_reg <= #1 {aw{1'b0}};

        else if (ce_a)

                addr_a_reg <= #1 addr_a;

//

// RAM write

//

always @(posedge clk_b)

        if (ce_b && we_b)

                mem[addr_b] <= #1 di_b;

`endif  // !OR1200_ALTERA_LPM

`endif  // !OR1200_XILINX_RAMB4_S16_S16

`endif  // !OR1200_XILINX_RAM32X1D

`endif  // !OR1200_VIRTUALSILICON_SSP_T1

`endif  // !OR1200_VIRTUALSILICON_SSP_T2

`endif  // !OR1200_VIRAGE_STP

`endif  // !OR1200_AVANT_ATP

`endif  // !OR1200_ARTISAN_SDP

endmodule