这是一个基于xilinx ISE9.1的一个历程，包含两个FIFO代码，第一个FIFO读写用同一个时钟，第二个FIFO读写用不同的时钟。-This is a xilinx ISE9.1 based on a course code consists of two FIFO, the first FIFO read and write using the same clock, the second FIFO read and write with a different clock.