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[/] [openrisc/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_spram_32_bw.v] - Blame information for rev 643

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1 142 marcus.erl
//////////////////////////////////////////////////////////////////////
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////                                                              ////
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////  Generic Single-Port Synchronous RAM 32-bit Byte-Write       ////
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////                                                              ////
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////  This file is part of memory library available from          ////
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////  http://www.opencores.org/cvsweb.shtml/generic_memories/     ////
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////                                                              ////
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////  Description                                                 ////
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////  This block is a wrapper with common single-port             ////
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////  synchronous memory interface for different                  ////
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////  types of ASIC and FPGA RAMs. Beside universal memory        ////
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////  interface it also provides behavioral model of generic      ////
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////  single-port synchronous RAM.                                ////
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////  It should be used in all OPENCORES designs that want to be  ////
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////  portable accross different target technologies and          ////
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////  independent of target memory.                               ////
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////                                                              ////
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////  Author(s):                                                  ////
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////      - Michael Unneback, unneback@opencores.org              ////
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////      - Tadej Markovic, tadej.markovic@gmail.com              ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
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////                                                              ////
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//// Copyright (C) 2000 Authors and OPENCORES.ORG                 ////
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////                                                              ////
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//// This source file may be used and distributed without         ////
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//// restriction provided that this copyright statement is not    ////
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//// removed from the file and that any derivative work contains  ////
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//// the original copyright notice and the associated disclaimer. ////
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////                                                              ////
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//// This source file is free software; you can redistribute it   ////
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//// and/or modify it under the terms of the GNU Lesser General   ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any   ////
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//// later version.                                               ////
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////                                                              ////
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//// This source is distributed in the hope that it will be       ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
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//// PURPOSE.  See the GNU Lesser General Public License for more ////
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//// details.                                                     ////
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////                                                              ////
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//// You should have received a copy of the GNU Lesser General    ////
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//// Public License along with this source; if not, download it   ////
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//// from http://www.opencores.org/lgpl.shtml                     ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
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//
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// CVS Revision History
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//
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// $Log: or1200_dpram_32x32.v,v $
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// Revision 2.0  2010/06/30 11:00:00  ORSoC
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// New 
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//
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// synopsys translate_off
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`include "timescale.v"
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// synopsys translate_on
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`include "or1200_defines.v"
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module or1200_spram_32_bw
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  (
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`ifdef OR1200_BIST
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   // RAM BIST
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   mbist_si_i, mbist_so_o, mbist_ctrl_i,
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`endif
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   // Generic synchronous single-port RAM interface
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   clk, ce, we, addr, di, doq
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   );
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   //
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   // Default address and data buses width
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   //
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   parameter aw = 10;
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   parameter dw = 32;
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`ifdef OR1200_BIST
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   //
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   // RAM BIST
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   //
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   input mbist_si_i;
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   input [`OR1200_MBIST_CTRL_WIDTH - 1:0] mbist_ctrl_i;
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   output                                 mbist_so_o;
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`endif
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   //
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   // Generic synchronous single-port RAM interface
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   //
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   input                                  clk;  // Clock
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   input                                  ce;   // Chip enable input
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   input [3:0]                             we;   // Write enable input
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   input [aw-1:0]                          addr; // address bus inputs
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   input [dw-1:0]                          di;   // input data bus
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   output [dw-1:0]                         doq;  // output data bus
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   //
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   // Internal wires and registers
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   //
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   //
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   // Generic single-port synchronous RAM model
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   //
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   //
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   // Generic RAM's registers and wires
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   //
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`ifdef OR1200_GENERIC
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   reg [7:0]                               mem0 [(1<<aw)-1:0] /*synthesis syn_ramstyle = "no_rw_check"*/;
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   reg [7:0]                               mem1 [(1<<aw)-1:0] /*synthesis syn_ramstyle = "no_rw_check"*/;
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   reg [7:0]                               mem2 [(1<<aw)-1:0] /*synthesis syn_ramstyle = "no_rw_check"*/;
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   reg [7:0]                               mem3 [(1<<aw)-1:0] /*synthesis syn_ramstyle = "no_rw_check"*/;
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`else
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   reg [7:0]                               mem0 [(1<<aw)-1:0];
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   reg [7:0]                               mem1 [(1<<aw)-1:0];
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   reg [7:0]                               mem2 [(1<<aw)-1:0];
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   reg [7:0]                               mem3 [(1<<aw)-1:0];
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`endif
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   reg [aw-1:0]                    addr_reg;             // RAM address register
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   //
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   // Data output drivers
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   //
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   assign doq = {mem0[addr_reg], mem1[addr_reg], mem2[addr_reg], mem3[addr_reg]};
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   //
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   // RAM read address register
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   //
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   always @(posedge clk)
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     if (ce)
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       addr_reg <=  addr;
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   //
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   // RAM write - big endian selection
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   //
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   always @(posedge clk)
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     if (ce) begin
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       if (we[3])
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         mem0[addr] <=  di[31:24];
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       if (we[2])
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         mem1[addr] <=  di[23:16];
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       if (we[1])
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         mem2[addr] <=  di[15:08];
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       if (we[0])
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         mem3[addr] <=  di[07:00];
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     end
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endmodule // or1200_spram

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