Features, Functional Description | Cypress CY7C1292DV18 instruction

CY7C1292DV18

CY7C1294DV18

Features

•Separate Independent Read and Write data ports

—Supports concurrent transactions

•250-MHz clock for high bandwidth

•2-Word Burst on all accesses

•Double Data Rate (DDR) interfaces on both Read and Write ports (data transferred at 500 MHz) @ 250 MHz

•Two input clocks (K and K) for precise DDR timing

—SRAM uses rising edges only

•Two input clocks for output data (C and C) to minimize clock-skew and flight-time mismatches

•Echo clocks (CQ and CQ) simplify data capture in high-speed systems

•Single multiplexed address input bus latches address inputs for both Read and Write ports

•Separate Port Selects for depth expansion

•Synchronous internally self-timed writes

•Available in x 18 and x 36 configurations

•Full data coherency, providing most current data

•Core VDD = 1.8V (±0.1V); I/O VDDQ = 1.4V to VDD

•Available in 165-ball FBGA package (13 x 15 x 1.4 mm)

•Offered in both lead-free and non-lead free packages

•Variable drive HSTL output buffers

•JTAG 1149.1 compatible test access port

•Delay Lock Loop (DLL) for accurate data placement

9-Mbit QDR- II™ SRAM 2-Word Burst Architecture

Functional Description

The CY7C1292DV18 and CY7C1294DV18 are 1.8V Synchronous Pipelined SRAMs, equipped with QDR™-II architecture. QDR-II architecture consists of two separate ports to access the memory array. The Read port has dedicated Data Outputs to support Read operations and the Write Port has dedicated Data Inputs to support Write opera- tions. QDR-II architecture has separate data inputs and data outputs to completely eliminate the need to “turn-around” the data bus required with common I/O devices. Access to each port is accomplished through a common address bus. The Read address is latched on the rising edge of the K clock and the Write address is latched on the rising edge of the K clock. Accesses to the QDR-II Read and Write ports are completely independent of one another. In order to maximize data throughput, both Read and Write ports are equipped with Double Data Rate (DDR) interfaces. Each address location is associated with two 18-bit words (CY7C1292DV18) or 36-bit words (CY7C1294DV18) that burst sequentially into or out of the device. Since data can be transferred into and out of the device on every rising edge of both input clocks (K and K and C and C), memory bandwidth is maximized while simplifying system design by eliminating bus “turn-arounds.”

Depth expansion is accomplished with Port Selects for each port. Port selects allow each port to operate independently.

All synchronous inputs pass through input registers controlled by the K or K input clocks. All data outputs pass through output registers controlled by the C or C (or K or K in a single clock domain) input clocks. Writes are conducted with on-chip synchronous self-timed write circuitry.

Configurations

CY7C1292DV18 – 512K x 18

CY7C1294DV18 – 256K x 36

Selection Guide

	250 MHz	200 MHz	167 MHz	Unit
Maximum Operating Frequency	250	200	167	MHz

Maximum Operating Current	600	550	500	mA

Cypress Semiconductor Corporation	•	198 Champion Court • San Jose, CA 95134-1709	•	408-943-2600
Document #: 001-00350 Rev. *A		Revised July 20, 2006

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