IS43R32800D 8Mx32 256-Mbit DDR SDRAM ISSI IS43R32800D 8Mx32 256-Mbit DDR SDRAM achieves high-speed data transfer using pipeline architecture and two data word accesses per clock cycle. The 268,435,456-bit memory array is internally organized as four banks of 64MB to allow concurrent operations. The pipeline allows Read and Write burst accesses to be virtually continuous, with the option to concatenate or truncate the bursts. The programmable features of burst length, burst sequence, and CAS latency enable further advantages.