The code is used to interface PC monitor with Spartan 3E for the display. if you run the program on spartan 3 you would be able to see different test pattern on the monitor screen

基于Verilog HDL的视频测试pattern发生器。内置各种常见模式。-Verilog HDL-based video test pattern generator. Built-in a variety of common models.

ISCAS89测试基准电路，verilog编写，可用于测试向量的生成(iscas89 benchmark, written in verilog language, can be used to generate test pattern)