pipeline disable commands to the same degree as read
commands. SCD SRAMs pipeline deselect commands one
stage less than read commands. SCD RAMs begin turning off
their outputs immediately after the deselect command has been
captured in the input registers. DCD RAMs hold the deselect
command for one full cycle and then begin turning off their
outputs just after the second rising edge of clock. The user may
configure this SRAM for either mode of operation using the SCD
mode input on Bump 4L.
Byte Write and Global Write
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. Byte write operation
is performed by using byte write enable (BWE).input combined
with one or more individualbyte write signals (BWx). In addition,
Global Write (GW) is available for writing all bytes at one time,
regardless of the byte write controls.
IOL/IOH Drive strength Options
The XQ pin allows selection between high drive strength (XQ
low) for multi-drop bus applications and normal drive strength
(XQ floating or high) point-to-point applications. See the Output
Driver Characteristics chart for details.
Snooze Mode
Low power (Snooze mode) is attained through the assertion
(High) of the ZZ signal, or by stopping the clock (CK). Memory
data is retained during Snooze mode.
DESCRIPTION
ICSI's 8Mb SyncBurst Pipelined SRAMs integrate a 512k
x 18, 256k x 32, or 256k x 36 SRAM core with advanced
synchronous peripheral circuitry and a 2-bit burst counter.
Applications
The ICSI SyncBurst Pipelined SRAM family employs
high-speed ,low-power CMOS designs that are fabricated
using an advanced CMOS process to provide Level 2
Cache applications supporting Pentium and PowerPC
microprocessors originally, the device now finds applica-
tion ranging from DSP main store to networking chip set
support.
FAST ACCESS TIME
Pipeline
3-1-1-1
Symbol
t
KQ
t
KC
I
CC
1
-250
3
4
390
-200
3.1
5
360
-166
3.5
6
330
-133
4
7.5
300
Units
ns
ns
mA
ICSI 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 errors
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