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70T659S12DRGI Datasheet(PDF) 7 Page - Integrated Device Technology

Part # 70T659S12DRGI
Description  HIGH-SPEED 2.5V 256/128K x 36 ASYNCHRONOUS DUAL-PORT STATIC RAM
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

70T659S12DRGI Datasheet(HTML) 7 Page - Integrated Device Technology

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IDT70T651/9S
High-Speed 2.5V 256/128K x 36 Asynchronous Dual-Port Static RAM
Industrial and Commercial Temperature Ranges
NOTES:
1. "H" = VIH, "L" = VIL, "X" = Don't Care.
2. It is possible to read or write any combination of bytes during a given access. A few representative samples have been illustrated here.
Truth Table I—Read/Write and Enable Control(1,2)
OE
SEM
CE0
CE1
BE3
BE2
BE1
BE0
R/W
ZZ
Byte 3
I/O27-35
Byte 2
I/O18-26
Byte 1
I/O9-17
Byte 0
I/O0-8
MODE
X
H
H
X
X
X
X
X
X
L
High-Z
High-Z
High-Z
High-Z
Deselected–Power Down
X
H
X
L
X
X
X
X
X
L
High-Z
High-Z
High-Z
High-Z
Deselected–Power Down
X
H
L
HHHH
H
X
L
High-Z
High-Z
High-Z
High-Z
All Bytes Deselected
X
H
L
HHHH
L
L
L
High-Z
High-Z
High-Z
DIN
Write to Byte 0 Only
X
H
L
H
H
H
L
H
L
L
High-Z
High-Z
DIN
High-Z
Write to Byte 1 Only
XH
L
H
H
L
H
H
L
L
High-Z
DIN
High-Z
High-Z
Write to Byte 2 Only
X
H
LH
LH
H
H
L
L
DIN
High-Z
High-Z
High-Z
Write to Byte 3 Only
X
H
L
H
H
H
L
L
L
L
High-Z
High-Z
DIN
DIN
Write to Lower 2 Bytes Only
X
H
L
H
LL
H
H
LL
DIN
DIN
High-Z
High-Z
Write to Upper 2 bytes Only
X
H
L
H
LLL
LLL
DIN
DIN
DIN
DIN
Write to All Bytes
L
H
L
HHHH
L
H
L
High-Z
High-Z
High-Z
DOUT
Read Byte 0 Only
L
H
L
H
H
H
L
H
H
L
High-Z
High-Z
DOUT
High-Z
Read Byte 1 Only
LH
LH
H
L
H
H
H
L
High-Z
DOUT
High-Z
High-Z
Read Byte 2 Only
LH
LH
LH
H
H
H
L
DOUT
High-Z
High-Z
High-Z
Read Byte 3 Only
L
H
L
H
H
H
L
L
H
L
High-Z
High-Z
DOUT
DOUT
Read Lower 2 Bytes Only
LH
LH
L
L
H
H
H
L
DOUT
DOUT
High-Z
High-Z
Read Upper 2 Bytes Only
LH
LH
L
L
L
LH
L
DOUT
DOUT
DOUT
DOUT
Read All Bytes
H
H
L
H
L
L
L
L
X
L
High-Z
High-Z
High-Z
High-Z
Outputs Disabled
XXXXXXXX
X
H
High-Z
High-Z
High-Z
High-Z
High-Z Sleep Mode
5632 tbl 02
Truth Table II – Semaphore Read/Write Control(1)
NOTES:
1. There are eight semaphore flags written to I/O0 and read from all the I/Os (I/O0-I/O35). These eight semaphore flags are addressed by A0-A2.
2. CE = L occurs when CE0 = VIL and CE1 = VIH. CE = H when CE0 = VIH and/or CE1 = VIL.
3. Each byte is controlled by the respective BEn. To read data BEn = VIL.
Inputs(1)
Outputs
Mode
CE(2)
R/W
OE
BE3
BE2
BE1
BE0
SEM
I/O1-35
I/O0
H
H
LLL
LL
L
DATAOUT
DATAOUT Read Data in Semaphore Flag(3)
H
X
XXX
L
L
X
DATAIN
Write I/O0 into Semaphore Flag
L
X
X
XXX
X
L
______
______
Not Allowed
5632 tbl 03


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