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參數(shù)資料
| 型號： | IDT7MPV6256S66M |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | DRAM |
| 英文描述： | 256KB AND 512KB SECONDARY CACHE MODULES FOR THE PowerPCO |
| 中文描述： | 64K X 64 CACHE TAG SRAM MODULE, 8.5 ns, DMA178 |
| 封裝： | CELP MODULE-178 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大小： | 84K |
| 代理商： | IDT7MPV6256S66M |
Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
JUNE 1996
1996 Integrated Device Technology, Inc.
DSC-3608/2
1
FEATURES
For CHRP based PowerPC
systems.
Asynchronous and pipelined burst SRAM options in the
same module pinout
Low-cost, low-profile card edge module with 178 leads
Uses Burndy Computerbus
connector, part number
ELF182KSC-3Z50
Operates with external PowerPC CPU speeds up to
66MHz
Separate 5V (
±
5%) and 3.3V (+10/-5%) power supplies
Multiple GND pins and decoupling capacitors for maxi-
mum noise immunity
Presence Detect output pins allow the system to deter-
mine the particular cache configuration.
DESCRIPTION
The IDT7MPV6253/55/56 modules belong to a family of
secondary caches intended for use with PowerPC CPU-
based systems. The IDT7MPV6253 uses IDT’s 71V256 32K
The IDT logo is a registered trademark of Integrated Device Technology, Inc. PowerPC is a trademark of IBM. Computerbus is trademark of Burndy.
x 8 asynchronous static RAMs and the IDT7MPV6255/56 use
IDT’s 71V432 32K x 32 pipelined synchronous burst static
RAMs in plastic surface mount packages mounted on a
multilayer epoxy laminate (FR-4) board. In addition, each of
the modules uses the IDT 71216 16K x 15 Cache-Tag static
RAM and IDT FCT logic. Extremely high speeds are achieved
using IDT’s high-reliability, low cost CMOS technology.
The low profile card edge package allows 178 signal leads
to be placed on a package 5.06" long, a maximum of 0.250"
thick and a maximum of 1.08" tall. The module space savings
versus discrete components allows the OEM to design addi-
tional functions onto the system or to shrink the size of the
motherboard for reduced cost.
All inputs and outputs are LVTTL-compatible, and operate
from separate 5V (
±
5%) and 3.3V (+10/-5%) power supplies.
Multiple GND pins and on-board decoupling capacitors en-
sure maximum protection from noise.
FUNCTIONAL BLOCK DIAGRAM
IDT7MPV6253 – 256KB ASYNCHRONOUS VERSION
drw 01
DH
0
- DH
7
DH
8
- DH
15
DH
16
- DH
23
DH
24
- DH
31
8
8
8
8
WE#
0
WE#
1
WE#
2
WE#
3
SRAM OE
1
DL
0
- DL
7
DL
8
- DL
15
DL
16
- DL
23
DL
24
- DL
31
WE#
4
WE#
5
WE#
6
WE#
7
ADDR
A0
ADDR
A1
A
14
- A
26
PD
2
PD
3
PD
0
PD
1
L
ADDR
A0
ADDR
A1
SRAM OE
0
13
13
8K x 12
Tag Field
32K x 8
Asynchronous
SRAM
A
14
- A
2613
TWE#
TOE#
ALE
32K x 8
Asynchronous
SRAM
8
8
8
8
32K x 8
Asynchronous
SRAM
32K x 8
Asynchronous
SRAM
32K x 8
Asynchronous
SRAM
32K x 8
Asynchronous
SRAM
32K x 8
Asynchronous
SRAM
32K x 8
Asynchronous
SRAM
A
2
- A
13
12
8K x 2
Status
STANDBY
TCLR#
TVALID
DIRTYIN
CLK
2
TMATCH
DIRTYOUT
STANDBY
STANDBY
256KB AND 512KB SECONDARY
CACHE MODULES FOR THE
PowerPC
IDT7MPV6253
IDT7MPV6255/56
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