IDT70V639S_15 Datasheet, PDF (15/24 Pages) Integrated Device Technology – HIGH-SPEED 3.3V 128K x 18 ASYNCHRONOUS DUAL-PORT STATIC RAM

IDT70V639S
High-Speed 3.3V 128K x 18 Asynchronous Dual-Port Static RAM
Industrial and Commercial Temperature Ranges
Timing Waveform of Write with Port-to-Port Read and BUSY (M/S = VIH)^(2,4,5)
tWC
ADDR"A"
MATCH
tWP
R/W"A"
DATAIN "A"
ADDR"B"
tAPS⁽¹⁾
BUSY"B"
tBAA
tDW
VALID
MATCH
tDH
tBDA
tBDD
DATAOUT "B"
tWDD
tDDD ⁽³⁾
NOTES:
1. To ensure that the earlier of the two ports wins. tAPS is ignored for M/S = VIL (SLAVE).
2. CEL = CER = VIL.
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".
VALID
.
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Timing Waveform of Write with BUSY (M/S = VIL)
R/W"A"
BUSY"B"
tWP
tWB⁽³⁾
tWH⁽¹⁾
R/W"B"
(2)
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.
5621 drw 13
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