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[/] [i650/] [trunk/] [rtl/] [check_acc_tlu.v] - Rev 26
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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: Error check accumulator, adder carry, and TLU. // // Additional Comments: See US 2959351, Fig. 83. // // 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 ////////////////////////////////////////////////////////////////////////////////// `include "defines.v" module check_acc_tlu ( input rst, input ap, bp, input d0, d2, d1_dx, input [0:6] acc_ped_out, input sel_store_add_gate, err_reset, carry_test_latch, no_carry_test_latch, output acc_zero, acc_no_zero, output reg check_latch ); reg tlu_check; assign acc_zero = acc_ped_out[`biq_b0] & acc_ped_out[`biq_q0]; assign acc_no_zero = acc_ped_out[`biq_b5] | acc_ped_out[`biq_q4] | acc_ped_out[`biq_q3] | acc_ped_out[`biq_q2] | acc_ped_out[`biq_q1]; wire acc_err1_p = ~(acc_zero | acc_no_zero) & d1_dx; wire acc_err2_p = (acc_zero & acc_no_zero) & d1_dx; wire carry_err1_p = ~(carry_test_latch | no_carry_test_latch) & tlu_check; wire carry_err2_p = carry_test_latch & no_carry_test_latch; wire set_check_latch_p = acc_err1_p | acc_err2_p | carry_err1_p | carry_err2_p; always @(posedge ap) if (rst) begin tlu_check <= 0; end else if (d0) begin tlu_check <= 0; end else if (d2 & sel_store_add_gate) begin tlu_check <= 1; end; always @(posedge bp) if (rst) begin check_latch <= 0; end else if (err_reset) begin check_latch <= 0; end else if (set_check_latch_p) begin check_latch <= 1; end; endmodule
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