64Mbit asynchronous SRAM in a 48-ball FBGA
The Cypress CY7C1081DV33-12BAXI is a 64Mbit asynchronous SRAM organized as 4M x 16 bits, with a 12 ns access time that sets the bus timing margin for the memory interface.
The 12 ns access time is the headline rating that determines whether this SRAM can keep up with the system bus without wait states. In a typical 66 MHz or 100 MHz bus environment, a 12 ns random access allows the memory controller to meet setup-and-hold windows with a few nanoseconds of margin, provided the board trace lengths are kept under about 2 inches.