verilog fifo 代码

代码说明：

FIFO is a First-In-First-Out memory queue with control logic that manages  the read and write operations, generates status flags, and provides optional  handshake signals for interfacing with the user logic. It is often used to  control the flow of data between source and destination. FIFO can be  classified as synchronous or asynchronous depending on whether same clock  or different (asynchronous) clocks control the read and write operations. In  this project the objective is to design, verify and synthesize a synchronous  FIFO using binary coded read and write pointers to address the memory  array. FFIO full and empty flags are generated and passed on to source and  destination logics, respectively, to pre-empt any overflow or underflow of  data. In this way data integrity between source and destination is maintained.  The RTL description for the FIFO is