EDA设计技术教学课件第11章ModelSim仿真工具.pptVIP

创建VCD文件例：创建全加器adder的VCD文件。第一步，设计全加器模块源文件文件adder.v。moduleadder(sum_out,carry_out,carry_in,ina,inb);outputsum_out;outputcarry_out;inputina,inb;inputcarry_in;wirecarry_out;wiresum_out;assign{carry_out,sum_out}=ina+inb+carry_in;endmoduleVCD文件格式分析第二步，例化全加器模块，设计测试平台文件test_bench.v。`timescale10ns/1nsmoduletest_bench;regcarry_in,ina,inb;wiresum_out,carry_out; adderdut(//例化全加器模块 .sum_out(sum_out), .carry_out(carry_out), .carry_in(carry_in), .ina(ina), .inb(inb) ); initial//生成功能校验激励信号begin {carry_in,ina,inb}=3b000; #20; {carry_in,ina,inb}=3b001; ? #20; {carry_in,ina,inb}=3b010; #20; {carry_in,ina,inb}=3b011; #20; {carry_in,ina,inb}=3b100; #20; {carry_in,ina,inb}=3b101; #20; {carry_in,ina,inb}=3b110; #20; {carry_in,ina,inb}=3b111; #20;end initial$dumpports(test_bench.dut,adder.vcd);//创建VCD文件?endmodule创建VCD文件第三步，按基本仿真流程，创建并编译工程，完成编译、加载、执行仿真一系列操作。创建VCD文件退出仿真进程，关闭ModelSim，打开仿真工程文件夹。创建VCD文件$comment//创建方式注释 Filecreatedusingthefollowingcommand: vcdfileadder.vcd-dumpports$end$date//创建日期 TueMay1416:53:582013$end$version//版本信息 dumpportsModelSimVersion10.0e$end$timescale//时间单位 1ns$end$scopemoduletest_bench$end//转储文件范围$scopemoduledut$end//转储文件范围$varport10sum_out$end//变量列表$varport11carry_out$end$varport12carry_in$end$varport13ina$end$varport14inb$end$upscope$end$upscope$end ?$enddefinitions$end#0$dumpports//结点信息pL600