IDT70V24L55PFI 데이터 시트보기 (PDF) - Integrated Device Technology
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IDT70V24L55PFI Datasheet PDF : 22 Pages
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IDT70V24S/L
High-Speed 4K x 16 Dual-Port Static RAM
Industrial and Commercial Temperature Ranges
Truth Table I: Non-Contention Read/Write Control
Inputs(1)
Outputs
CE
R/W
OE
UB
LB
SEM
I/O8-15
I/O0-7
Mode
H
X
X
X
X
H
High-Z
High-Z Deselected: Power Down
X
X
X
H
H
H
High-Z
High-Z Both Bytes Deselected
L
L
X
L
H
H
DATAIN
High-Z Write to Upper Byte Only
L
L
X
H
L
H
High-Z
DATAIN Write to Lower Byte Only
L
L
X
L
L
H
DATAIN
DATAIN Write to Both Bytes
L
H
L
L
H
H
DATAOUT
High-Z Read Upper Byte Only
L
H
L
H
L
H
High-Z
DATAOUT Read Lower Byte Only
L
H
L
L
L
H
DATAOUT
DATAOUT Read Both Bytes
X
X
H
X
X
X
High-Z
High-Z Outputs Disabled
NOTE:
1. A0L — A11L ≠ A0R — A11R
2911 tbl 02
Truth Table II: Semaphore Read/Write Control(1)
Inputs
Outputs
CE
R/W
OE
UB
LB
SEM
I/O8-15
I/O0-7
Mode
H
H
L
X
X
L
DATAOUT
DATAOUT Read Data in Semaphore Flag
X
H
L
H
H
L
DATAOUT
DATAOUT Read Data in Semaphore Flag
H
↑
X
X
X
L
DATAIN
DATAIN Write DIN0 into Semaphore Flag
X
↑
X
H
H
L
DATAIN
DATAIN Write DIN0 into Semaphore Flag
L
X
X
L
X
L
____
____
Not Allowed
L
X
X
X
L
L
____
____
Not Allowed
NOTE:
1. There are eight semaphore flags written to via I/O0 and read from all of the I/O's (I/O0-I/O15). These eight semaphores are addressed by A0-A2.
2911 tbl 03
6.442
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