📄 io_cell.v
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//******************************************************************* ////IMPORTANT NOTICE ////================ ////Copyright Mentor Graphics Corporation 1996 - 1999. All rights reserved. ////This file and associated deliverables are the trade secrets, ////confidential information and copyrighted works of Mentor Graphics ////Corporation and its licensors and are subject to your license agreement ////with Mentor Graphics Corporation. //// ////Use of these deliverables for the purpose of making silicon from an IC ////design is limited to the terms and conditions of your license agreement ////with Mentor Graphics If you have further questions please contact Mentor ////Graphics Customer Support. //// ////This Mentor Graphics core (m8051 v1999.120) was extracted on ////workstation hostid _hostid_ Inventra ///////////////////////////////////////////////////////////////////////// %W% %G% SCCS Version Control// File : io_cell.v// Author : K Dennis// Library : WORK// Created on : July 5th 1996// Purpose : Simple tri-state io buffer model// : test chip// Version : 1.002// Mod_Date : 16,iv.97 RPD signals converted to upper case// Mod_Hist ://// (C) Copyright Mentor Graphics Corporation 1997. All rights reserved.// V1.002///////////////////////////////////////////////////////////////////////Hierarchy record ://Called by :// :m8051_tb.v and variants//Calls to :none// ://///////////////////////////////////////////////////////////////////module io_cell (O, I, DIR, IO);//******************************************************************* ////IMPORTANT NOTICE ////================ ////Copyright Mentor Graphics Corporation 1996 - 1999. All rights reserved. ////This file and associated deliverables are the trade secrets, ////confidential information and copyrighted works of Mentor Graphics ////Corporation and its licensors and are subject to your license agreement ////with Mentor Graphics Corporation. //// ////Use of these deliverables for the purpose of making silicon from an IC ////design is limited to the terms and conditions of your license agreement ////with Mentor Graphics If you have further questions please contact Mentor ////Graphics Customer Support. //// ////This Mentor Graphics core (m8051 v1999.120) was extracted on ////workstation hostid _hostid_ Inventra // output O; input I; input DIR; inout IO; tri1 IO; reg TRIOUT;///////////////////////////////////////////////////////////////////////DIR is direction control, 0 is output, 1 is input, X or Z produce X//I is input internal to device.//O is output internal to device//IO is bidirectional port external to buffer. /////////////////////////////////////////////////////////////////////buf U2 (O,IO);/////////////////////////////////////////////////////////////////////always @ (DIR or I or IO)begin if (DIR == 1'b0) TRIOUT = I; else begin if (DIR == 1'b1) TRIOUT = 1'bz; else TRIOUT = 1'bx; endend/////////////////////////////////////////////////////////////////////assign IO = TRIOUT;/////////////////////////////////////////////////////////////////////endmodule⌨️ 快捷键说明
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