?? carry4.v
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// $Header: /devl/xcs/repo/env/Databases/CAEInterfaces/verunilibs/data/rainier/CARRY4.v,v 1.5 2007/06/01 00:24:45 yanx Exp $///////////////////////////////////////////////////////////////////////////////// Copyright (c) 1995/2004 Xilinx, Inc.// All Right Reserved.///////////////////////////////////////////////////////////////////////////////// ____ ____// / /\/ /// /___/ \ / Vendor : Xilinx// \ \ \/ Version : 10.1// \ \ Description : Xilinx Functional Simulation Library Component// / / Fast Carry Logic with Look Ahead // /___/ /\ Filename : CARRY4.v// \ \ / \ Timestamp : Thu Mar 25 16:42:55 PST 2004// \___\/\___\//// Revision:// 04/11/05 - Initial version.// 05/06/05 - Unused CYINT or CI pin need grounded instead of open (CR207752)// 05/31/05 - Change pin order, remove connection check for CYINIT and CI.// 05/30/07 - Change timescale to 1 ps / 1ps.// End Revision`timescale 1 ps / 1 psmodule CARRY4 (CO, O, CI, CYINIT, DI, S); output [3:0] CO; output [3:0] O; input CI; input CYINIT; input [3:0] DI; input [3:0] S; wire ci_or_cyinit;// initial// ci_or_cyinit = 0; assign O = S ^ {CO[2:0], ci_or_cyinit}; assign CO[0] = S[0] ? ci_or_cyinit : DI[0]; assign CO[1] = S[1] ? CO[0] : DI[1]; assign CO[2] = S[2] ? CO[1] : DI[2]; assign CO[3] = S[3] ? CO[2] : DI[3]; assign ci_or_cyinit = CYINIT | CI;// always @(CYINIT or CI)// if (CYINIT === 1'bz || CYINIT === 1'bx) begin// $display("Error: CARRY4 instance, %m, detects CYINIT unconnected. Only one of CI and CYINIT inputs can be used and other one need be grounded.");// $finish;// end// else if (CI=== 1'bz || CI=== 1'bx) begin// $display("Error: CARRY4 instance, %m, detects CI unconnected. Only one of CI and CYINIT inputs can be used and other one need be grounded.");// $finish;// end// else // ci_or_cyinit = CYINIT | CI;endmodule
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