Introduction - If you have any usage issues, please Google them yourself
First-in, first-out queue, which is a traditional sequential execution method, first enter the command to complete and retire, followed by the second instruction before it is implemented. Is a FIFO data buffer, and he is the difference between ordinary no external memory write address lines, so it is very simple, but the disadvantage is that the order can only write data, read data sequentially, the data address by the internal write pointer is automatically incremented to complete, not like ordinary memory address lines that can be read from or written to a decision to the address specified