First-In First-OUT memory and flag signal generating method thereof

摘要

PURPOSE: A FIFO(First-Input First-Output) memory and a method for generating a flag signal of the FIFO memory are provided to match to a fast system by advancing the occurrence time of the flag signals. CONSTITUTION: The FIFO memory comprises a write address generator for generating a write address by responding to a write clock signal, a read address generator for generating a read address by responding to a read clock signal, and a memory cell array having a plurality of memory cells between a plurality of write/read word lines and a plurality of write/read bit lines, storing the write data by responding to the write address and outputting the read data by responding to the read address. A flag generator generates a full flag signal by responding to the write clock signal in case that the following write address and the present read address is same and generates an empty flag signal by responding to the read clock signal in case that the present write address and the following read address is same.