IDT72021/031/041s are high-speed, low-power, dual-port memory devices commonly known as FIFOs (First-In/First-Out). Data can be written into and read from the memory at independent rates. The order of information stored and ex- tracted does not change, but the rate of data entering the FIFO might be different than the rate leaving the FIFO. Unlike a Static RAM, no address information is required because the read and write pointers advance sequentially. The IDT72021/ 031/041s can perform asynchronous read and write operations, and have four status flags (Full, Empty, Half-Full and Almost Empty/Almost Full).