synchronous static RAM designed to provide a burstable,
high-performance memory for high speed networking and
communication applications. It is organized as 262,144
words by 16 bits and 18 bits, fabricated with
ISSI
's
advanced CMOS technology. The device integrates a 2-bit
burst counter, high-speed SRAM core, and high-drive
capability outputs into a single monolithic circuit. All
synchronous inputs pass through registers controlled by
a positive-edge-triggered single clock input.
Write cycles are internally self-timed and are initiated by
the rising edge of the clock input. Write cycles can be from
one to four bytes wide as controlled by the write control
inputs.
Separate byte enables allow individual bytes to be written.
BW1
controls DQ1-8,
BW2
controls DQ9-16, conditioned
by
BWE
being LOW. A LOW on
GW
input would cause all
bytes to be written.
Bursts can be initiated with either
ADSP
(Address Status
Processor) or
ADSC
(Address Status Cache Controller)
input pins. Subsequent burst addresses can be generated
internally and controlled by the
ADV
(burst address
advance) input pin.
The mode pin is used to select the burst sequence order,
Linear burst is achieved when this pin is tied LOW.
Interleave burst is achieved when this pin is tied HIGH or
left floating.
FAST ACCESS TIME
Symbol
t
KQ
t
KC
Parameter
Clock Access Time
Cycle Time
Frequency
-166
3.5
6
166
-150
3.8
6.7
150
-133
4
7.5
133
-5
5
10
100
Units
ns
ns
MHz
ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible product. We assume no responsibility for any
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NXP MCU
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