QDR II synchronous SRAM at 250 MHz — what the clock rate buys the bus
The Infineon Cypress CY7C1413KV18-250BZCT is a 36Mbit QDR II synchronous SRAM organized as 2M x 18 bits, clocked at 250 MHz. QDR II (Quad Data Rate) architecture separates read and write data ports, eliminating the bus-turnaround dead cycles that standard synchronous SRAMs incur on mixed read-write traffic. For a network switch buffer or a test-equipment waveform memory that alternates read and write every cycle, this part sustains full 250 MHz throughput on both ports simultaneously — no wait states for direction changes.
36 Mbit in a 2M x 18 word — sizing the datapath
The 2M x 18 organization gives 18-bit-wide words, which suits designs that need a parity or ECC bit alongside a 16-bit data word — common in telecom line cards and high-reliability storage controllers. The 36 Mbit total density fits moderate-depth look-up tables, packet buffers, or cache tag stores. If the design needs a 36-bit or 72-bit bus, two or four of these parts can be depth- or width-expanded with the QDR II port-select logic.
1.8 V supply rail and 165-ball FBGA footprint
Decoupling should follow the QDR II layout guide: one 0.1 µF capacitor per supply ball pair, placed within 50 mils of the ball.