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[/] [i650/] [trunk/] [rtl/] [ram_word_offset.v] - Rev 12
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`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // IBM 650 Reconstruction in Verilog (i650) // // This file is part of the IBM 650 Reconstruction in Verilog (i650) project // http:////www.opencores.org/project,i650 // // Description: // Convert dynamic portion of 650 address into a word offset in general // storage RAM. // // Additional Comments: // // Copyright (c) 2015 Robert Abeles // // 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 ram_word_offset ( input [0:6] addr_t, addr_u, output reg [0:9] offset ); always @(*) begin case({addr_t[2:6], addr_u}) 12'b00001_01_00001: offset = 10'd0; 12'b00001_01_00010: offset = 10'd12; 12'b00001_01_00100: offset = 10'd24; 12'b00001_01_01000: offset = 10'd36; 12'b00001_01_10000: offset = 10'd48; 12'b00001_10_00001: offset = 10'd60; 12'b00001_10_00010: offset = 10'd72; 12'b00001_10_00100: offset = 10'd84; 12'b00001_10_01000: offset = 10'd96; 12'b00001_10_10000: offset = 10'd108; 12'b00010_01_00001: offset = 10'd120; 12'b00010_01_00010: offset = 10'd132; 12'b00010_01_00100: offset = 10'd144; 12'b00010_01_01000: offset = 10'd156; 12'b00010_01_10000: offset = 10'd168; 12'b00010_10_00001: offset = 10'd180; 12'b00010_10_00010: offset = 10'd192; 12'b00010_10_00100: offset = 10'd204; 12'b00010_10_01000: offset = 10'd216; 12'b00010_10_10000: offset = 10'd228; 12'b00100_01_00001: offset = 10'd240; 12'b00100_01_00010: offset = 10'd252; 12'b00100_01_00100: offset = 10'd264; 12'b00100_01_01000: offset = 10'd276; 12'b00100_01_10000: offset = 10'd288; 12'b00100_10_00001: offset = 10'd300; 12'b00100_10_00010: offset = 10'd312; 12'b00100_10_00100: offset = 10'd324; 12'b00100_10_01000: offset = 10'd336; 12'b00100_10_10000: offset = 10'd348; 12'b01000_01_00001: offset = 10'd360; 12'b01000_01_00010: offset = 10'd372; 12'b01000_01_00100: offset = 10'd384; 12'b01000_01_01000: offset = 10'd396; 12'b01000_01_10000: offset = 10'd408; 12'b01000_10_00001: offset = 10'd420; 12'b01000_10_00010: offset = 10'd432; 12'b01000_10_00100: offset = 10'd444; 12'b01000_10_01000: offset = 10'd456; 12'b01000_10_10000: offset = 10'd468; 12'b10000_01_00001: offset = 10'd480; 12'b10000_01_00010: offset = 10'd492; 12'b10000_01_00100: offset = 10'd504; 12'b10000_01_01000: offset = 10'd516; 12'b10000_01_10000: offset = 10'd528; 12'b10000_10_00001: offset = 10'd540; 12'b10000_10_00010: offset = 10'd552; 12'b10000_10_00100: offset = 10'd564; 12'b10000_10_01000: offset = 10'd576; 12'b10000_10_10000: offset = 10'd588; default: offset = 15'd0; endcase; end; endmodule
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