Asynchronous FIFO circuit and method of reading and writing data through asynchronous FIFO circuit

摘要

An asynchronous FIFO circuit has ;a memory; ;asynchronous reading and writing means of reading a predetermined amount of data from and of reading the predetermined amount of data into the memory on a first-in-first-out basis; ;an error write counter of counting counts up by 1 if the predetermined amount of data written into the memory contains an error; ;an error read counter of counting up by 1 if the predetermined amount of data read from the memory contains an error; ;comparing means of comparing a value of the error write counter with a value of the error read counter, the comparing means outputting a logic level of 0 when the value of the error write counter is coincident with the value of the error read counter, the comparing means outputting a logic level of 1 if the former value is different from the latter value.