CY7C1347G

The CY7C1347G is a 3.3V, 128K x 36 synchronous-pipelined SRAM designed to support zero-wait-state secondary cache with minimal glue logic.CY7C1347G I/O pins can operate at either the 2.5V or the 3.3V level, the I/O pins are 3.3V tolerant when V_DDQ = 2.5V.All synchronous inputs pass through input registers controlled by the rising edge of the clock. All data outputs pass through output registers controlled by the rising edge of the clock. Maximum access delay from the clock rise is 2.6 ns (250-MHz device).CY7C1347G supports either the interleaved burst sequence used by the Intel Pentium processor or a linear burst sequence used by processors such as the PowerPC®. The burst sequence is selected through the MODE pin. Accesses can be initiated by asserting either the Address Strobe from Processor (ADSP) or the Address Strobe from Controller (ADSC) at clock rise. Address advancement through the burst sequence is controlled by the ADV input. A 2-bit on-chip wraparound burst counter captures the first address in a burst sequence and automatically increments the address for the rest of the burst access.

Byte write operations of CY7C1347G are qualified with the four Byte Write Select (BW_[A:D]) inputs. A Global Write Enable (GW) overrides all byte write inputs and writes data to all four bytes. All writes are conducted with on-chip synchronous self-timed write circuitry.

Three synchronous Chip Selects (CE₁, CE₂, CE₃) and an asynchronous Output Enable (OE)CY7C1347G provide for easy bank selection and output tri-state control. In order to provide proper data during depth expansion, OE is masked during the first clock of a read cycle when emerging from a deselected state.