CYM74SP55PM-66 View Datasheet(PDF) - Cypress Semiconductor
Part Name
Description
Manufacturer
CYM74SP55PM-66 Datasheet PDF : 7 Pages
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1CY M74 SP5 4/55
CYM74BP54
CYM74P54/55
PRELIMINARY
CYM74SP54/55
Intel® 82430NX Chipset
Level II Cache Module Family
Features
• Pin-compatible secondary cache module family
• Asynchronous (CYM74BP54), synchronous pipelined
(CYM74P54, CYM74P55), or synchronous
(CYM74SP54, CYM74SP55) configurations with pres-
ence and configuration detect pins
• Ideal for Intel® P54C-based systems with the 82430NX
(Neptune) chipset
• Operates at 60 and 66 MHz
• Uses cost-effective CMOS asynchronous SRAMs or
high-performance synchronous SRAMs
• 160-position Burndy DIMM CELP2X80SC3Z48
connector
• 3.3V inputs/outputs
Functional Description
This family of secondary cache modules is designed for Intel
P54C systems with the 82430NX (Neptune) chipset.
CYM74BP54 is an asynchronous 256-Kbyte cache module
that provides a low-cost, high-performance solution with in-
Logic Block Diagram - CYM74BP54
A17-A 7
ADDRESS LATCH
dustry standard 5V SRAMs and 3.3V level translators for CPU
bus speeds up to 66 MHz. The CYM74BP54 is organized as
32K by 64-bits.
The synchronous modules are available with low-cost syn-
chronous pipelined RAMs or higher performance synchronous
burst RAMs. The synchronous pipelined modules are based
on a 16Kx64 RAM. The CYM74P54 is a 256-KB module while
the CYM74P55 is a 512-KB module. Both are modules without
byte parity.
The CYM74SP54 and CYM74SP55 are synchronous burst
cache modules that provide zero wait-state performance at a
bus speed of 66 MHz. The CYM74SP54 is a 256-Kbyte cache
module with byte parity. The CYM74SP55 is a 512-Kbyte
cache module with byte parity.
Multiple ground pins and on-board decoupling capacitors en-
sure high performance with maximum noise immunity.
All components on the cache modules are surface mounted
on a multi-layer epoxy laminate (multifunctional) substrate.
The contact pins are plated with 150 micro-inches of nickel
covered by 10 micro-inches of gold flash.
A6–0-A 5–0
LA17-LA 5
CALE
LE
32K x 8
32K x 8
32K x 8
32K x 8
D0-D 7
D8-D 15
D16-D 23
D24-D 31
A4–0-A 3–0
CE0
OE0
WE0-WE 3
D
A
CE
OE
WE0
32K x 8
D
A
CE
OE
WE1
32K x 8
D
A
CE
OE
WE2
32K x 8
D
A
CE
OE
WE3
32K x 8
D32-D 39
D40-D 47
D48-D 55
D56-D 63
A4–1-A 3–1
CE1
OE1
WE4-WE 7
D
A
CE
OE
WE4
Intel is a registered trademark of Intel Corporation.
D
A
CE
OE
WE5
D
A
CE
OE
WE6
A
D
A
CE
OE
WE7
74BP54–1
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
May 1994 – Revised October 1995
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