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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Generic Single-Port Synchronous RAM with byte write signals ////
////                                                              ////
////  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 single-port             ////
////  synchronous memory interface for different                  ////
////  types of ASIC and FPGA RAMs. Beside universal memory        ////
////  interface it also provides behavioral model of generic      ////
////  single-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 Single-Port Sync RAM                              ////
////  - Avant! Two-Port Sync RAM (*)                              ////
////  - Virage Single-Port Sync RAM                               ////
////  - Virtual Silicon Single-Port Sync RAM                      ////
////                                                              ////
////  Supported FPGA RAMs are:                                    ////
////  - Xilinx Virtex RAMB4_S16                                   ////
////  - Altera LPM                                                ////
////                                                              ////
////  To Do:                                                      ////
////   - xilinx rams need external tri-state logic                ////
////   - fix avant! two-port ram                                  ////
////   - 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 $
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "or1200_defines.v"
 
module or1200_spram_2048x32_bw(
`ifdef OR1200_BIST
        // RAM BIST
        scanb_rst, scanb_si, scanb_so, scanb_en, scanb_clk,
`endif
        // Generic synchronous single-port RAM interface
        clk, rst, ce, we, oe, addr, di, do
);
 
`ifdef OR1200_BIST
//
// RAM BIST
//
input                   scanb_rst,
                        scanb_si,
                        scanb_en,
                        scanb_clk;
output                  scanb_so;
`endif
 
//
// Generic synchronous single-port RAM interface
//
input                   clk;    // Clock
input                   rst;    // Reset
input                   ce;     // Chip enable input
input   [3:0]           we;     // Write enable input
input                   oe;     // Output enable input
input   [10:0]          addr;   // address bus inputs
input   [31:0]          di;     // input data bus
output  [31:0]          do;     // output data bus
 
//
// Internal wires and registers
//
 
`ifdef OR1200_ARTISAN_SSP
`else
`ifdef OR1200_VIRTUALSILICON_SSP
`else
`ifdef OR1200_BIST
assign scanb_so = scanb_si;
`endif
`endif
`endif
 
 
`ifdef OR1200_ARTISAN_SSP
 
//
// Instantiation of ASIC memory:
//
// Artisan Synchronous Single-Port RAM (ra1sh)
//
`ifdef UNUSED
art_hssp_2048x32_bw artisan_ssp(
`else
`ifdef OR1200_BIST
art_hssp_2048x32_bw_bist artisan_ssp(
`else
art_hssp_2048x32_bw artisan_ssp(
`endif
`endif
`ifdef OR1200_BIST
        // RAM BIST
        .scanb_rst(scanb_rst),
        .scanb_si(scanb_si),
        .scanb_so(scanb_so),
        .scanb_en(scanb_en),
        .scanb_clk(scanb_clk),
`endif
        .CLK(clk),
        .CEN(~ce),
        .WEN(~we),
        .A(addr),
        .D(di),
        .OEN(~oe),
        .Q(do)
);
 
`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),
        .do(do)
);
 
`else
 
`ifdef OR1200_VIRAGE_SSP
 
//
// Instantiation of ASIC memory:
//
// Virage Synchronous 1-port R/W RAM
//
virage_ssp virage_ssp(
        .clk(clk),
        .adr(addr),
        .d(di),
        .we(we),
        .oe(oe),
        .me(ce),
        .q(do)
);
 
`else
 
`ifdef OR1200_VIRTUALSILICON_SSP
 
//
// Instantiation of ASIC memory:
//
// Virtual Silicon Single-Port Synchronous SRAM
//
`ifdef OR1200_BIST
wire scanb_si_ram_0;
wire scanb_si_ram_1;
wire scanb_si_ram_2;
wire scanb_si_ram_3;
wire scanb_so_ram_0;
wire scanb_so_ram_1;
wire scanb_so_ram_2;
wire scanb_so_ram_3;
assign scanb_si_ram_0 = scanb_si;
assign scanb_si_ram_1 = scanb_so_ram_0;
assign scanb_si_ram_2 = scanb_so_ram_1;
assign scanb_si_ram_3 = scanb_so_ram_2;
assign scanb_so = scanb_so_ram_3;
`endif
 
`ifdef UNUSED
vs_hdsp_2048x8 vs_ssp_0(
`else
`ifdef OR1200_BIST
vs_hdsp_2048x8_bist vs_ssp_0(
`else
vs_hdsp_2048x8 vs_ssp_0(
`endif
`endif
`ifdef OR1200_BIST
        // RAM BIST
        .scanb_rst(scanb_rst),
        .scanb_si(scanb_si_ram_0),
        .scanb_so(scanb_so_ram_0),
        .scanb_en(scanb_en),
        .scanb_clk(scanb_clk),
`endif
        .CK(clk),
        .ADR(addr),
        .DI(di[7:0]),
        .WEN(~we[0]),
        .CEN(~ce),
        .OEN(~oe),
        .DOUT(do[7:0])
);
 
`ifdef UNUSED
vs_hdsp_2048x8 vs_ssp_1(
`else
`ifdef OR1200_BIST
vs_hdsp_2048x8_bist vs_ssp_1(
`else
vs_hdsp_2048x8 vs_ssp_1(
`endif
`endif
`ifdef OR1200_BIST
        // RAM BIST
        .scanb_rst(scanb_rst),
        .scanb_si(scanb_si_ram_1),
        .scanb_so(scanb_so_ram_1),
        .scanb_en(scanb_en),
        .scanb_clk(scanb_clk),
`endif
        .CK(clk),
        .ADR(addr),
        .DI(di[15:8]),
        .WEN(~we[1]),
        .CEN(~ce),
        .OEN(~oe),
        .DOUT(do[15:8])
);
 
`ifdef UNUSED
vs_hdsp_2048x8 vs_ssp_2(
`else
`ifdef OR1200_BIST
vs_hdsp_2048x8_bist vs_ssp_2(
`else
vs_hdsp_2048x8 vs_ssp_2(
`endif
`endif
`ifdef OR1200_BIST
        // RAM BIST
        .scanb_rst(scanb_rst),
        .scanb_si(scanb_si_ram_2),
        .scanb_so(scanb_so_ram_2),
        .scanb_en(scanb_en),
        .scanb_clk(scanb_clk),
`endif
        .CK(clk),
        .ADR(addr),
        .DI(di[23:16]),
        .WEN(~we[2]),
        .CEN(~ce),
        .OEN(~oe),
        .DOUT(do[23:16])
);
 
`ifdef UNUSED
vs_hdsp_2048x8 vs_ssp_3(
`else
`ifdef OR1200_BIST
vs_hdsp_2048x8_bist vs_ssp_3(
`else
vs_hdsp_2048x8 vs_ssp_3(
`endif
`endif
`ifdef OR1200_BIST
        // RAM BIST
        .scanb_rst(scanb_rst),
        .scanb_si(scanb_si_ram_3),
        .scanb_so(scanb_so_ram_3),
        .scanb_en(scanb_en),
        .scanb_clk(scanb_clk),
`endif
        .CK(clk),
        .ADR(addr),
        .DI(di[31:24]),
        .WEN(~we[3]),
        .CEN(~ce),
        .OEN(~oe),
        .DOUT(do[31:24])
);
 
`else
 
`ifdef OR1200_XILINX_RAMB4
 
//
// Instantiation of FPGA memory:
//
// Virtex/Spartan2
//
 
//
// Block 0
//
RAMB4_S2 ramb4_s2_0(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[1:0]),
	.EN(ce),
	.WE(we[0]),
	.DO(do[1:0])
);
 
//
// Block 1
//
RAMB4_S2 ramb4_s2_1(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[3:2]),
	.EN(ce),
	.WE(we[0]),
	.DO(do[3:2])
);
 
//
// Block 2
//
RAMB4_S2 ramb4_s2_2(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[5:4]),
	.EN(ce),
	.WE(we[0]),
	.DO(do[5:4])
);
 
//
// Block 3
//
RAMB4_S2 ramb4_s2_3(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[7:6]),
	.EN(ce),
	.WE(we[0]),
	.DO(do[7:6])
//
// Block 4
//
RAMB4_S2 ramb4_s2_4(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[9:8]),
	.EN(ce),
	.WE(we[1]),
	.DO(do[9:8])
);
 
//
// Block 5
//
RAMB4_S2 ramb4_s2_5(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[11:10]),
	.EN(ce),
	.WE(we[1]),
	.DO(do[11:10])
);
 
//
// Block 6
//
RAMB4_S2 ramb4_s2_6(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[13:12]),
	.EN(ce),
	.WE(we[1]),
	.DO(do[13:12])
);
 
//
// Block 7
//
RAMB4_S2 ramb4_s2_7(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[15:14]),
	.EN(ce),
	.WE(we[1]),
	.DO(do[15:14])
 
//
// Block 8
//
RAMB4_S2 ramb4_s2_8(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[17:16]),
	.EN(ce),
	.WE(we[2]),
	.DO(do[17:16])
);
 
//
// Block 9
//
RAMB4_S2 ramb4_s2_9(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[19:18]),
	.EN(ce),
	.WE(we[2]),
	.DO(do[19:18])
);
 
//
// Block 10
//
RAMB4_S2 ramb4_s2_10(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[21:20]),
	.EN(ce),
	.WE(we[2]),
	.DO(do[21:20])
);
 
//
// Block 11
//
RAMB4_S2 ramb4_s2_11(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[23:22]),
	.EN(ce),
	.WE(we[2]),
	.DO(do[23:22])
//
// Block 12
//
RAMB4_S2 ramb4_s2_12(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[25:24]),
	.EN(ce),
	.WE(we[3]),
	.DO(do[25:24])
);
 
//
// Block 13
//
RAMB4_S2 ramb4_s2_13(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[27:26]),
	.EN(ce),
	.WE(we[3]),
	.DO(do[27:26])
);
 
//
// Block 14
//
RAMB4_S2 ramb4_s2_14(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[29:28]),
	.EN(ce),
	.WE(we[3]),
	.DO(do[29:28])
);
 
//
// Block 15
//
RAMB4_S2 ramb4_s2_15(
	.CLK(clk),
	.RST(rst),
	.ADDR(addr),
	.DI(di[31:30]),
	.EN(ce),
	.WE(we[3]),
	.DO(do[31:30])
 
`else
 
//
// Generic single-port synchronous RAM model
//
 
//
// Generic RAM's registers and wires
//
reg     [31:0]        mem_0 [10:0];              // RAM content
reg     [31:0]        mem_1 [10:0];              // RAM content
reg     [31:0]        mem_2 [10:0];              // RAM content
reg     [31:0]        mem_3 [10:0];              // RAM content
reg     [31:0]        do_reg;                 // RAM data output register
 
//
// Data output drivers
//
assign do = (oe) ? do_reg : {32{1'b0}};
 
//
// RAM read and write
//
always @(posedge clk)
        if (ce && !we) begin
                do_reg[7:0]   <= #1 mem_0[addr];
                do_reg[15:8]  <= #1 mem_1[addr];
                do_reg[23:16] <= #1 mem_2[addr];
                do_reg[31:24] <= #1 mem_3[addr];
        end 
        else if (ce && we[0])
                mem_0[addr] <= #1 di[7:0];
        else if (ce && we[1])
                mem_1[addr] <= #1 di[15:8];
        else if (ce && we[2])
                mem_2[addr] <= #1 di[23:16];
        else if (ce && we[3])
                mem_3[addr] <= #1 di[31:24];
 
`endif  // !OR1200_XILINX_RAMB4_S16
`endif  // !OR1200_VIRTUALSILICON_SSP
`endif  // !OR1200_VIRAGE_SSP
`endif  // !OR1200_AVANT_ATP
`endif  // !OR1200_ARTISAN_SSP
 
endmodule