CYM74S551PM-50C View Datasheet(PDF) - Cypress Semiconductor
Part Name
Description
Manufacturer
CYM74S551PM-50C Datasheet PDF : 8 Pages
| |||
1CY M74 S55 0,
CYM7 4S 551
CYM74B550
CYM74P550A
PRELIMINARY CYM74S550, CYM74S551
Features
• Pin-compatible secondary cache module family
• Asynchronous (CYM74B550), synchronous pipelined
(CYM74P550A), or synchronous burst (CYM74S550,
CYM74S551) modules
• Ideal for Intel P54C/P55C systems with the OPTi Viper
chipset
• Operates at 50, 60, and 66 MHz
• Uses cost-effective CMOS asynchronous SRAMs or
high-performance synchronous SRAMs
• 160-position Burndy DIMM CELP2X80SC3Z48 connec-
tor
• 3.3V inputs/ data outputs
Functional Description
This family of secondary cache modules is designed for Intel
P54C/P55C systems with the OPTi Viper chip set.
CYM74B550 is a low cost asynchronous cache module that
provides 256-Kbytes of cache with industry standard 32Kx8 5
OPTi Viper Chip Set Level II
Cache Module Family
volt SRAMs and 3.3 volt level translators. These modules offer
3-2-2-2 performance at CPU bus speeds up to 66 MHz.
The synchronous modules are available with low cost synchro-
nous pipelined RAMs or high performance synchronous burst
RAMs.
The CYM74P550A is a high performance synchronous pipe-
lined burst 256 KB module and is based on industry standard
32Kx32 pipelined BSRAM. The CYM74P550A has series
damping resistors on the data lines.
The CYM74S550 and CYM74S551 are high performance syn-
chronous burst cache modules that provide 256-Kbytes and
512-Kbytes of cache respectively. These modules support
3-1-1-1 performance at 66 MHz.
All of these modules include storage for 8-bits of tag and one
dirty bit. Multiple ground pins and on-board decoupling capac-
itors ensure high performance with maximum noise immunity.
All components on the cache modules are surface mounted on
a multi-layer epoxy laminate (FR-4) substrate. The contact
pins are plated with 100 micro-inches of nickel covered by 10
micro-inches of gold flash.
Logic Block Diagram - CYM74B550
TAGWE
16Kx1
DIRTYWE
DIRTYI
WE
DQ
A 13:0
8Kx8
WE
D
A 13:0
PD3 PD2 PD1 PD0
CYM74B550 NC NC GND GND
TAG 7–TAG 0
A17–A5
HACALE
OCA 4
ECA 4
ECAWE
ECDOE
CS7–CS 0
2X
373C
LE
A17 –A 5
A17–A 5
LA 17 –LA 5
LA17–LA5
32Kx 8
5V only SRAMs
A14:2
D
A1
A0
WE
OE
CE CE CE CE CE CE CE CE LSB
CS7 CS6 CS 5 CS4 CS3 CS2 CS 1 CS0
DIRTYO
CD 63–CD 0
100 ohms
VCC
VCC5
CD63–CD0
7X
CYBUS3384
A
B
BE2
GND BE1
4.3V zener
5% tolerance
GND
D63–D0
module 3.3V compliant databus
74b550-1
Intel is a trademark of Intel Corporation.
OPTi is a trademark of OPTi, Inc.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
July 1995 - Revised October 1996
Share Link: 