The device provides two independent ports with separate control,address,and I/O pins that permit independent,asynchronous access for reads or writes to any location in memory.

• 它提供两个独立的口,这两个口可以单独控制、有独自的地址和I/O引脚,从而实现了对内存任何地址的独立的、异步的存取(读写)。