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參數(shù)資料
| 型號： | CYM74S551 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | OPTi Viper Chip Set Level II Cache Module Family(OPTi Viper 芯片組電平II高速緩沖存儲器模塊系列) |
| 中文描述： | 奧普蒂蝰蛇芯片組二級緩存模塊系列（奧普蒂蝰蛇芯片組電平二高速緩沖存儲器模塊系列） |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 197K |
| 代理商： | CYM74S551 |
PRELIMINARY
OPTi Viper Chip Set Level II
Cache Module Family
CYM74B550
CYM74P550A
CYM74S550, CYM74S551
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
July 1995 - Revised October 1996
408-943-2600
1CYM74S550,
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
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.
Intel is a trademark of Intel Corporation.
OPTi is a trademark of OPTi, Inc.
LogicBlock Diagram - CYM74B550
TAGWE
CE
D
WE
OE
32Kx 8
A
17
–A
5
LE
HACALE
A
0
CE
CE
CE
CE
CE
CE
CE
A
1
A
14:2
ECA
4
ECAWE
ECDOE
A
17
–A
5
CS
7
–CS
0
373C
DIRTYWE
DIRTYI
DIRTYO
TAG
7
–TAG
0
WE
WE
D
16Kx1
8Kx8
D
A
13:0
A
13:0
Q
CD
63
–CD
0
CS
7
CS
6
CS
5
CS
4
CS
3
CS
2
CS
1
CS
0
LSB
LA
17
–LA
5
OCA
4
PD
3
NC
PD
2
NC
PD
1
GND
PD
0
GND
CYM74B550
2X
5V only SRAMs
4.3V zener
5% tolerance
100 ohms
V
CC5
GND
V
CC
GND
CD
63
–CD
0
D
63
–D
0
module 3.3V compliant databus
BE
2
BE
1
CYBUS3384
7X
A
B
LA
17
–LA
5
A
17
–A
5
74b550-1
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