Cypress Semiconductor CYM74S551PM-50C Datasheet

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 • 408-943-2600

July 1995 - Revised October 1996

1CYM74S 550,
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 connec­tor

• 3.3V inputs/ data outputs

Functional Descriptio n

This family of secondary cache modules is designed for Intel
P54C/P55C systems with the OPTi Viper chip set.

CYM74B550 is a low cost a synchronous 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 synchro­nous pipelined RAMs or high performance synchronous bur st
RAMs.

The CYM74P550A is a high performance synchronous pipe­lined 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 performanc e 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 stor age for 8-bits of tag and one
dirty bit. Multiple ground pins and on-board decou pl ing 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.

LogicBlockDiagram

-

CYM74B550

CE

D

WE
OE

32Kx 8

A

17–A5

LEHACALE

A

0

CE CE CE CE CE CE CE

A

1

A

14:2

ECA

4

ECAWE

ECDOE

A

17–A5

CS7–CS

0

373C

TAGWE

DIRTYWE

DIRTYI

DIRTYO

TAG

7

–TAG

0

WEWE

16Kx1

8Kx8

D

A

13:0

A

13:0

DQ

CD

63

–CD

0

CS7CS6CS5CS4CS3CS2CS1CS

0

LSB

LA

17

–LA

5

OCA

4

PD3PD2PD1PD

0

GNDGNDNC NCCYM74B550

2X

5V only SRAMs

4.3V zener
5% toler an ce

100 ohms

V

CC5

GND

V

CC

GND

CD

63

–CD

0

D63–D

0

module 3.3V compliant databus

BE

2

BE

1

CYBUS3384

7X

AB

LA

17

–LA

5

A

17–A5

74b550-1

CYM74B550

CYM74P550A

CYM74S550, CYM74S551

PRELIMINARY

2

LogicBlock Diagram – CYM74P550A

D

CE

1

OE

SYNCS

0

ECDOE

WE7–WE

0

A

ADV

ADV

ADSC ADSC

ADSP

CLK

15

BE3–BE

0

CK

CE

2

CE

3

D

CE

1

OE

A

ADV

ADSC

ADSP

CK

CE

3

V

SS

32Kx32 32Kx32

BE3–BE

0

TAGWE

DIRTYWE

DIRTYI

DIRTYO

TAG7–TAG

0

WEWE

16Kx1

8Kx8 (CYM74P550A)

D

A

13:0

A

13:0

DQ

PD3PD2PD1PD

0

NCNC NCCYM74P550A GND

ADSP

D63–D

0

D

31–D0

D63–D

32

V

SS

V

CC3

V

CC3

CE

2

WE3–WE

0

WE7–WE

4

A

17–A5

A

17–A3

A

17–A5

74b550-2

CYM74B550

CYM74P550A

CYM74S550, CYM74S551

PRELIMINARY

3

WE

1:0

A

15:0

CE
OE

ADV

ADSC

ADSP

Note: A18is not used by CYM74S550

CLK

D

WE

1:0

WE

1:0

WE

1:0

WE

7

–

WE

0

CLK

ECDOE

SYNCS

0

ADV

ADSC

DP Pullup to V

CC3

D63–D

0

WE

1:0

WE

3:2

WE

5:4

WE

7:6

32Kx18(CYM74S550)
64Kx18(CYM74S551)

A

18

–A

3

TAGWE

DIRTYWE

DIRTYI

DIRTYO

TAG7–TAG

0

WEWE

16Kx1

8Kx8 (CYM74S550)

32Kx8 (CYM74S551 )

D

A

13:0

A

13:0

DQ

A

18–A5

A18–A

5

PD3PD2PD1PD

0

NC
NCGND

NCNCNCCYM74S550

CYM74S551

GND
GND

LSBMSB

ADSP

Logic Bl ock Diagram - CYM74S550, CYM74S55 1

74b550-3

Selection G uide

Asynchronous Cache Modules

Part Number 74B550-50 74B550-60 74B550-66

Cache Size 256 KB
System Clock 50 MHz 60 MHz 66 MHz
Data SRAM t

AA

25 ns 15 ns 15 ns

Tag SRAM t

AA

20 ns 15 ns 12 ns

Synchronous Pipelined Cache Modules

Part Number 74P550A-50 74P550A-60 74P550A-66

Cache Size 256 KB
System Clock 50 MHz 60 MHz 66 MHz
Data SRAM t

CO

12 ns 9 ns 9 ns

Tag SRAM t

AA

20 ns 15 ns 12 ns

Synchronous Burst Cache Modules

Part Number 74S550-50 74S550-60 74S550-66 74S551-50 74S551-60 74S551-66

Cache Size 256 KB 512 KB
System Clock 50 MHz 60 MHz 66 MHz 50 MHz 60 MHz 66 MHz
Data SRAM t

CO

12 ns 9 ns 9 ns 12 ns 9 ns 9 ns

Tag SRAM t

AA

20 ns 15 ns 12 ns 20 ns 15 ns 12 ns