The IDT71342 is an extremely high-speed 4K x 8 Dual-Port Static RAM with full on-chip hardware support of semaphore signalling between the two ports. The IDT71342 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. To assist in arbitrating between ports, a fully independent semaphore logic block is provided. This block contains unassigned flags which can be accessed by either side; however, only one side can control the flag at any time. An automatic power down feature, controlled by CE and SEM, permits the on-chip circuitry of each port to enter a very low standby power mode (both CE and SEM High). Fabricated using IDT's CMOS high-performance technology, this device typically operates on only 500mW of power. Low-power (LA) versions offer battery backup data retention capability, with each port typically consuming 200W from a 2V battery. The device is packaged in either a 64-pin TQFP, thin quad plastic flatpack, or a 52-pin PLCC.