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IDT7130SA/LA and IDT7140SA/LA
High-Speed 1K x 8 Dual-Port Static SRAM
Military, Industrial and Commercial Temperature Ranges
Truth Tables
Truth Table I — Non-Contention Read/Write Control (4)
Inputs (1)
R/ W
X
X
L
H
H
CE
H
H
L
L
L
OE
X
X
X
L
H
D 0-7
Z
Z
DATA IN
DATA OUT
Z
Function
Port Disabled and in Power-Down Mode, I SB2 or I SB4
CE R = CE L = V IH , Power-Down Mode, I SB1 or I SB3
Data on Port Written into Memory (2)
Data in Memory Output on Port (3)
High Impedance Outputs
NOTES:
1. A 0L – A 10L ≠ A 0R – A 10R .
2. If BUSY = L, data is not written.
3. If BUSY = L, data may not be valid, see t WDD and t DDD timing.
4. 'H' = V IH , 'L' = V IL , 'X' = DON’T CARE, 'Z' = HIGH IMPEDANCE
Truth Table II — Interrupt Flag (1,4)
Left Port
Right Port
2689 tbl 13
H
R/ W L
L
X
X
X
CE L
L
X
X
L
OE L
X
X
X
L
A 9L -A 0L
3FF
X
X
3FE
INT L
X
X
L (3)
(2)
R/ W R
X
X
L
X
CE R
X
L
L
X
OE R
X
L
X
X
A 9R -A 0R
X
3FF
3FE
X
INT R
L (2)
H (3)
X
X
Function
Set Right INT R Flag
Reset Right INT R Flag
Set Left INT L Flag
Reset Left INT L Flag
NOTES :
1. Assumes BUSY L = BUSY R = V IH
2. If BUSY L = V IL , then No Change.
3. If BUSY R = V IL , then No Change.
4. 'H' = HIGH,' L' = LOW,' X' = DON’T CARE
Truth Table III — Address BUSY
Arbitration
2689 tbl 14
Inputs
Outputs
CE L
X
H
X
L
CE R
X
X
H
L
A 0L -A 9L
A 0R -A 9R
NO MATCH
MATCH
MATCH
MATCH
BUSY L (1)
H
H
H
(2)
BUSY R (1)
H
H
H
(2)
Function
Normal
Normal
Normal
Write Inhibit (3)
NOTES:
2689 tbl 15
1. Pins BUSY L and BUSY R are both outputs for IDT7130 (master). Both are inputs for
IDT7140 (slave). BUSY X outputs on the IDT7130 are open drain, not push-pull
outputs. On slaves the BUSY X input internally inhibits writes.
2. 'L' if the inputs to the opposite port were stable prior to the address and enable inputs
of this port. 'H' if the inputs to the opposite port became stable after the address and
enable inputs of this port. If t APS is not met, either BUSY L or BUSY R = LOW will
result. BUSY L and BUSY R outputs can not be LOW simultaneously.
3. Writes to the left port are internally ignored when BUSY L outputs are driving LOW
regardless of actual logic level on the pin. Writes to the right port are internally
ignored when BUSY R outputs are driving LOW regardless of actual logic level on
the pin.
18
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