IDT7140LA55PFB datasheet(12/14 Pages) IDT

12 / 14 page

IDT7130SA/LA AND IDT7140SA/LA

HIGH-SPEED 1K x 8 DUAL-PORT STATIC RAM WITH INTERRUPTS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

6.01

TRUTH TABLES

TABLE I — NON-CONTENTION

READ/WRITE CONTROL(4)

Left or Right Port(1)

W CE

D0–7

Function

Port Disabled and in Power-

Down Mode, ISB2 or ISB4

CER = CEL = VIH, Power-Down

Mode, ISB1 or ISB3

DATAIN

Data on Port Written Into Memory

(2)

DATAOUT Data in Memory Output on Port

(3)

High Impedance Outputs

NOTES:

2689 tbl 13

1. A0L – A10L

≠ A0R – A10R.

2. If

BUSY = L, data is not written.

3. If

BUSY = L, data may not be valid, see tWDD and tDDD timing.

4. 'H' = VIH, 'L' = VIL, 'X' = DON’T CARE, 'Z' = HIGH IMPEDANCE

TABLE III — ADDRESS BUSY ARBITRATION

Inputs

Outputs

A0L-A9L

CEL

CER

A0R-A9R

BUSY

BUSYL

(1)

BUSY

BUSYR

(1)

Function

NO MATCH

Normal

MATCH

Normal

MATCH

Normal

MATCH

(2)

Write Inhibit

(3)

NOTES:

2689 tbl 15

1. Pins

BUSYL and BUSYR are both outputs for IDT7130 (master). Both are

inputs for IDT7140 (slave).

BUSYX outputs on the IDT7130 are open drain,

not push-pull outputs. On slaves the

BUSYX 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 tAPS is not met,

either

BUSYL or BUSYR = Low will result. BUSYL and BUSYR outputs can

not be low simultaneously.

3. Writes to the left port are internally ignored when

BUSYL outputs are

driving Low regardless of actual logic level on the pin. Writes to the right

port are internally ignored when

BUSYR outputs are driving Low regard-

less of actual logic level on the pin.

TABLE II — INTERRUPT FLAG(1,4)

Left Port

Right Port

CEL

OEL

A9L – A0L

INT

INTL

CER

OER

A9L – A0R

INT

INTR

Function

3FF

(2)

Set Right

INTR Flag

3FF

(3)

Reset Right

INTR Flag

(3)

3FE

Set Left

INTL Flag

3FE

(2)

Reset Left

INTL Flag

NOTES:

2689 tbl 14

1. Assumes

BUSYL = BUSYR = VIH

2. If

BUSYL = VIL, then No Change.

3. If

BUSYR = VIL, then No Change.

4. 'H' = HIGH,' L' = LOW,' X' = DON’T CARE

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