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////////////////////////////////////////////////////////////////////// //// //// //// Wishbone Single-Port Synchronous RAM //// //// Memory Model //// //// //// //// This file is part of memory library available from //// //// http://www.opencores.org/cvsweb.shtml/minsoc/ //// //// //// //// Description //// //// This Wishbone controller connects to the wrapper of //// //// the single-port synchronous memory interface. //// //// Besides universal memory due to onchip_ram it provides a //// //// generic way to set the depth of the memory. //// //// //// //// To Do: //// //// //// //// Author(s): //// //// - Raul Fajardo, rfajardo@gmail.com //// //// //// ////////////////////////////////////////////////////////////////////// //// //// //// 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.gnu.org/licenses/lgpl.html //// //// //// ////////////////////////////////////////////////////////////////////// // // Revision History // // // Revision 1.0 2009/08/18 15:15:00 fajardo // Created interface and tested // `include "timescale.v" module minsoc_memory_model ( wb_clk_i, wb_rst_i, wb_dat_i, wb_dat_o, wb_adr_i, wb_sel_i, wb_we_i, wb_cyc_i, wb_stb_i, wb_ack_o, wb_err_o ); // // Parameters // parameter adr_width = 2; // // I/O Ports // input wb_clk_i; input wb_rst_i; // // WB slave i/f // input [31:0] wb_dat_i; output [31:0] wb_dat_o; input [31:0] wb_adr_i; input [3:0] wb_sel_i; input wb_we_i; input wb_cyc_i; input wb_stb_i; output wb_ack_o; output wb_err_o; // // Internal regs and wires // wire we; wire [3:0] be_i; wire [31:0] wb_dat_o; reg ack_we; reg ack_re; // // Aliases and simple assignments // assign wb_ack_o = ack_re | ack_we; assign wb_err_o = wb_cyc_i & wb_stb_i & (|wb_adr_i[23:adr_width+2]); // If Access to > (8-bit leading prefix ignored) assign we = wb_cyc_i & wb_stb_i & wb_we_i & (|wb_sel_i[3:0]); assign be_i = (wb_cyc_i & wb_stb_i) * wb_sel_i; // // Write acknowledge // always @ (negedge wb_clk_i or posedge wb_rst_i) begin if (wb_rst_i) ack_we <= 1'b0; else if (wb_cyc_i & wb_stb_i & wb_we_i & ~ack_we) ack_we <= #1 1'b1; else ack_we <= #1 1'b0; end // // read acknowledge // always @ (posedge wb_clk_i or posedge wb_rst_i) begin if (wb_rst_i) ack_re <= 1'b0; else if (wb_cyc_i & wb_stb_i & ~wb_err_o & ~wb_we_i & ~ack_re) ack_re <= #1 1'b1; else ack_re <= #1 1'b0; end minsoc_onchip_ram # ( .aw(adr_width) ) block_ram_0 ( .clk(wb_clk_i), .rst(wb_rst_i), .addr(wb_adr_i[adr_width+1:2]), .di(wb_dat_i[7:0]), .doq(wb_dat_o[7:0]), .we(we), .oe(1'b1), .ce(be_i[0])); minsoc_onchip_ram # ( .aw(adr_width) ) block_ram_1 ( .clk(wb_clk_i), .rst(wb_rst_i), .addr(wb_adr_i[adr_width+1:2]), .di(wb_dat_i[15:8]), .doq(wb_dat_o[15:8]), .we(we), .oe(1'b1), .ce(be_i[1])); minsoc_onchip_ram # ( .aw(adr_width) ) block_ram_2 ( .clk(wb_clk_i), .rst(wb_rst_i), .addr(wb_adr_i[adr_width+1:2]), .di(wb_dat_i[23:16]), .doq(wb_dat_o[23:16]), .we(we), .oe(1'b1), .ce(be_i[2])); minsoc_onchip_ram # ( .aw(adr_width) ) block_ram_3 ( .clk(wb_clk_i), .rst(wb_rst_i), .addr(wb_adr_i[adr_width+1:2]), .di(wb_dat_i[31:24]), .doq(wb_dat_o[31:24]), .we(we), .oe(1'b1), .ce(be_i[3])); endmodule