The Renesas 70V05L20PFGI is a 64Kbit dual-port asynchronous SRAM organized as 8K x 8 bits, with a 20 ns access time and a 20 ns write cycle time. This is not a single-port memory — the dual-port architecture gives two independent bus masters simultaneous read/write access to the same array, with on-chip arbitration logic handling address conflicts. Typical applications include shared memory between two processors in a multiprocessor system, buffering between a DSP and an FPGA, or a mailbox register in a redundant controller pair.
20 ns access — bus margin for a 50 MHz master
The 20 ns access time and 20 ns write cycle time are specified in the datasheet. The parallel interface uses address, data, and dual-port control signals including chip selects, read/write enables, and a BUSY flag for collision detection.
For a BOM that needs a proven dual-port SRAM for a multi-year production run, this part does not carry the supply risk of a phase-out line.