CY7C1214H Datasheet, PDF (1/15 Pages) Cypress Semiconductor – 1-Mbit (32K x 32) Flow-Through Sync SRAM

CY7C1214H
1-Mbit (32K x 32) Flow-Through Sync SRAM
Features
Functional Description^[1]
• 32K X 32 common I/O
• 3.3V core power supply (V_DD)
• 2.5V/3.3V I/O power supply (V_DDQ)
• Fast clock-to-output times
— 6.5 ns (for 133-MHz version)
• Provide high-performance 2-1-1-1 access rate
• User-selectable burst counter supporting Intel^®
Pentium^® interleaved or linear burst sequences
• Separate processor and controller address strobes
• Synchronous self-timed write
• Asynchronous output enable
• Available in JEDEC-standard lead-free 100-Pin TQFP
package
• “ZZ” Sleep Mode option
The CY7C1214H is a 32K x 32 synchronous cache RAM
designed to interface with high-speed microprocessors with
minimum glue logic. Maximum access delay from clock rise is
6.5 ns (133-MHz version). A 2-bit on-chip counter captures the
first address in a burst and increments the address automati-
cally for the rest of the burst access. All synchronous inputs
are gated by registers controlled by a positive-edge-triggered
Clock Input (CLK). The synchronous inputs include all
addresses, all data inputs, address-pipelining Chip Enable
(CE₁), depth-expansion Chip Enables (CE₂ and CE₃), Burst
Control inputs (ADSC, ADSP, and ADV), Write Enables
(BW_[A:D], and BWE), and Global Write (GW). Asynchronous
inputs include the Output Enable (OE) and the ZZ pin.
The CY7C1214H allows either interleaved or linear burst
sequences, selected by the MODE input pin. A HIGH selects
an interleaved burst sequence, while a LOW selects a linear
burst sequence. Burst accesses can be initiated with the
Processor Address Strobe (ADSP) or the cache Controller
Address Strobe (ADSC) inputs. Address advancement is
controlled by the Address Advancement (ADV) input.
Addresses and chip enables are registered at rising edge of
clock when either Address Strobe Processor (ADSP) or
Address Strobe Controller (ADSC) are active. Subsequent
burst addresses can be internally generated as controlled by
the Advance pin (ADV).
Logic Block Diagram
The CY7C1214H operates from a +3.3V core power supply
while all outputs may operate either with a +2.5V or +3.3V
supply. All inputs and outputs are JEDEC-standard
JESD8-5-compatible.
A0, A1, A
MODE
ADV
CLK
ADSC
ADSP
BWD
BWC
BWB
BWA
BWE
GW
CE1
CE2
CE3
OE
ADDRESS
REGISTER
A[1:0]
BURST ^Q1
COUNTER
AND LOGIC
CLR
Q0
DQD
BYTE
WRITE REGISTER
DQC
BYTE
WRITE REGISTER
DQB
BYTE
WRITE REGISTER
DQA
BYTE
WRITE REGISTER
ENABLE
REGISTER
DQD
BYTE
WRITE REGISTER
DQC
BYTE
WRITE REGISTER
DQB
BYTE
WRITE REGISTER
DQA
BYTE
WRITE REGISTER
MEMORY
ARRAY
OUTPUT
SENSE
BUFFERS
DQs
AMPS
INPUT
REGISTERS
ZZ
SLEEP
CONTROL
Note:
1. For best-practices recommendations, please refer to the Cypress application note System Design Guidelines on www.cypress.com.
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document #: 38-05671 Rev. *B
Revised July 6, 2006