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[/] [amber/] [trunk/] [hw/] [vlog/] [lib/] [generic_sram_byte_en.v] - Rev 8
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////////////////////////////////////////////////////////////////// // // // Generic Library SRAM with per byte write enable // // // // This file is part of the Amber project // // http://www.opencores.org/project,amber // // // // Description // // Configurable depth and width. The DATA_WIDTH must be a // // multiple of 8. // // // // Author(s): // // - Conor Santifort, csantifort.amber@gmail.com // // // ////////////////////////////////////////////////////////////////// // // // Copyright (C) 2010 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 // // // ////////////////////////////////////////////////////////////////// module generic_sram_byte_en #( parameter DATA_WIDTH = 128, parameter ADDRESS_WIDTH = 7 ) ( input i_clk, input [DATA_WIDTH-1:0] i_write_data, input i_write_enable, input [ADDRESS_WIDTH-1:0] i_address, input [DATA_WIDTH/8-1:0] i_byte_enable, output reg [DATA_WIDTH-1:0] o_read_data ); reg [DATA_WIDTH-1:0] mem [0:2**ADDRESS_WIDTH-1]; integer i; always @(posedge i_clk) begin // read o_read_data <= i_write_enable ? {DATA_WIDTH{1'd0}} : mem[i_address]; // write if (i_write_enable) for (i=0;i<DATA_WIDTH/8;i=i+1) begin mem[i_address][i*8+0] <= i_byte_enable[i] ? i_write_data[i*8+0] : mem[i_address][i*8+0] ; mem[i_address][i*8+1] <= i_byte_enable[i] ? i_write_data[i*8+1] : mem[i_address][i*8+1] ; mem[i_address][i*8+2] <= i_byte_enable[i] ? i_write_data[i*8+2] : mem[i_address][i*8+2] ; mem[i_address][i*8+3] <= i_byte_enable[i] ? i_write_data[i*8+3] : mem[i_address][i*8+3] ; mem[i_address][i*8+4] <= i_byte_enable[i] ? i_write_data[i*8+4] : mem[i_address][i*8+4] ; mem[i_address][i*8+5] <= i_byte_enable[i] ? i_write_data[i*8+5] : mem[i_address][i*8+5] ; mem[i_address][i*8+6] <= i_byte_enable[i] ? i_write_data[i*8+6] : mem[i_address][i*8+6] ; mem[i_address][i*8+7] <= i_byte_enable[i] ? i_write_data[i*8+7] : mem[i_address][i*8+7] ; end end endmodule
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