What this dual-port SRAM brings to a shared-memory bus
The Cypress CY7C09089V-12AC is a 512Kbit synchronous dual-port SRAM organized as 64K x 8, built for designs where two independent bus masters — processors, DSPs, or ASICs — need to exchange data through a common memory mailbox without dead cycles. Its 12 ns access time and 50 MHz clock rate let both ports arbitrate back-to-back transactions with minimal wait-state insertion, which matters when the system architecture cannot tolerate a full bus-turnaround penalty on every read-write sequence.
12 ns access and 50 MHz clock — the timing budget
The 12 ns access time is the window from address assertion to valid data on the bus. In a 50 MHz synchronous system with a 20 ns clock period, that leaves 8 ns for setup, hold, and trace delay — tight enough that the board layout needs matched-length traces between the SRAM and both controllers. The synchronous interface eliminates the dead cycle that an asynchronous dual-port would incur on every port-switch, so back-to-back reads from opposite ports land in consecutive clock edges.
It is not specified for outdoor base stations, engine compartments, or industrial enclosures where ambient temperatures climb above 70°C.
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