DDR-II SIO

The DDRII SIO SRAMs are similar to DDRII CIO SRAMs but they include two separate ports: 即用于访问内存阵列的读端口和写端口。The read port has data outputs to support read operation and the write port has data inputs to support write operation. The DDR II SIO SRAM completely eliminates the need to "turnaround" the data bus required with common I/O devices.