CY7C1510AV18
CY7C1525AV18
CY7C1512AV18
CY7C1514AV18
PRELIMINARY
72-Mbit QDR-II™ SRAM 2-Word Burst
Architecture
Features
Functional Description
• Separate Independent Read and Write Data Ports
— Supports concurrent transactions
• 250-MHz clock for high bandwidth
• 2-Word Burst on all accesses
The CY7C1510AV18, CY7C1525AV18, CY7C1512AV18 and
CY7C1514AV18 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 operations. 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
• 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
the rising edge of the clock. Accesses to the QDR-II Read
K
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 8-bit words
(CY7C1510AV18) or 9-bit words (CY7C1525AV18) or 18-bit
words (CY7C1512AV18) or 36-bit words (CY7C1514AV18)
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.”
• 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
• QDR-II operates with 1.5 cycle read latency when DLL
is enabled
• Operates like a QDR I device with 1 cycle read latency
in DLL off mode
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.
• Available in x8, x9, x18, and x36 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 (15 x 17 x 1.4 mm)
• Offered in 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
Configurations
CY7C1510AV18 – 8M x 8
CY7C1525AV18 – 8M x 9
CY7C1512AV18 – 4M x 18
CY7C1514AV18 – 2M x 36
Cypress Semiconductor Corporation
Document #: 001-06984 Rev. *B
•
198 Champion Court
•
San Jose, CA 95134-1709
•
408-943-2600
Revised September 20, 2006
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