IDT7009L
High-Speed 128K x 8 Dual-Port Static RAM
Truth Table I: Chip Enable (1,2)
Industrial and Commercial Temperature Ranges
CE
L
H
CE 0
V IL
< 0.2V
V IH
X
>V CC -0.2V
X
CE 1
V IH
>V CC -0.2V
X
V IL
X
<0.2V
Port Selected (TTL Active)
Port Selected (CMOS Active)
Port Deselected (TTL Inactive)
Port Deselected (TTL Inactive)
Port Deselected (CMOS Inactive)
Port Deselected (CMOS Inactive)
Mode
4839 tbl 06
NOTES:
1. Chip Enable references are shown above with the actual CE 0 and CE 1 levels, CE is a reference only.
2. 'H' = V IH and 'L' = V IL .
3. CMOS standby requires 'X' to be either < 0.2V or > V CC - 0.2V.
Truth Table II: Non-Contention Read/Write Control
Inputs (1)
Outputs
CE
(2)
H
L
L
X
R/ W
X
L
H
X
OE
X
X
L
H
SEM
H
H
H
X
I/O 0-7
High-Z
DATA IN
DATA OUT
High-Z
Deselected: Power-Down
Write to memory
Read memory
Outputs Disabled
Mode
NOTES:
1. A 0L – A 16L ≠ A 0R – A 16R.
2. Refer to Chip Enable Truth Table.
Truth Table III: Semaphore Read/Write Control (1)
4839 drw 07
Inputs
Outputs
CE
(2)
H
H
L
R/ W
H
X
OE
L
X
X
SEM
L
L
L
I/O 0-7
DATA OUT
DATA IN
______
Read Semaphore Flag Data Out
Write I/O 0 into Semaphore Flag
Not Allowed
Mode
4839 tbl 08
NOTES:
1. There are eight semaphore flags written to via I/O 0 and read from all the I/Os (I/O 0 -I/O 7 ). These eight semaphore flags are addressed by A 0 -A 2 .
2. Refer to Chip Enable Truth Table.
4
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