VCS-verilog compiled simulator是synopsys公司的产品.其仿真速度相当快,而且支持多种调用方式 使用的步骤和modelsim类似,都要先做编译,在调用仿真.-VCS-verilog compiled simulator is synopsys company' s products. The simulation very fast, and supports multiple call mode　use similar steps and modelsim, we must do first compiled, the call simulation.