7019L20PFGI8 datasheet(11/17 Pages) IDT

Part #	7019L20PFGI8

Description	HIGH-SPEED 128K x 9 DUAL-PORT STATIC RAM

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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11 / 17 page

6.42

IDT7019L

High-Speed 128K x 9 Dual-Port Static RAM

Industrial and Commercial Temperature Ranges

11

4840 drw 11

tDW

tAPS

ADDR"A"

tWC

DATAOUT "B"

MATCH

tWP

R/

W"A"

DATAIN "A"

ADDR"B"

tDH

VALID

(1)

MATCH

BUSY"B"

tBDA

VALID

tBDD

tDDD

(3)

tWDD

Timing Waveform of Write with Port-to-Port Read and BUSY(M/S = VIH)(2,4,5)

Timing Waveform of Write with BUSY (M/S = VIL)

NOTES:

1. To ensure that the earlier of the two ports wins. tAPS is ignored for M/S = VIL (SLAVE).

2. CEL = CER = VIL, refer to Chip Enable Truth Table.

3. OE = VIL for the reading port.

4. If M/S = VIL (SLAVE), BUSY is an input. Then for this example BUSY "A" = VIH and BUSY "B" input is shown above.

5. All timing is the same for left and right ports. Port "A" may be either the left or right port. Port "B" is the port opposite from port "A".

NOTES:

1. tWH must be met for both BUSY input (SLAVE) and output (MASTER).

2. BUSY is asserted on port "B" blocking R/W"B", until BUSY"B" goes HIGH.

3. tWB is only for the 'Slave' version.

4840 drw 12

R/

W"A"

BUSY"B"

tWP

tWB(3)

R/

W"B"

tWH

(1)

(2)

.

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