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IDT70P258/248L
Low Power 1.8V 8K/4K x 16 Dual-Port Static RAM
Industrial Temperature Range
Timing Waveform of Semaphore Read after Write Timing, Either Side (1)
t SAA
t O
H
A 0 -A 2
VALID ADDRESS
VALID ADDRESS
SEM
I/O 0
t AW
t EW
t WR
t DW
DATA IN
VALID
t SOP
t AC E
DATA OUT
VALID (2)
R/ W
OE
t AS
t WP
t DH
t SWRD
t AOE
NOTES:
Write Cycle
Read Cycle
5675 drw 08
,
1. CE = V IH or UB & LB = V IH for the duration of the above timing (both write and read cycle).
2. “DATA OUT VALID” represents all I/O's (I/O 0 -I/O 15 )equal to the semaphore value.
Timing Waveform of Semaphore Write Contention (1,3,4)
A 0"A" -A 2"A"
MATCH
(2)
SIDE
(2)
SIDE
"A"
"B"
R/W "A"
SEM "A"
A 0"B" -A 2"B"
R/W "B"
MATCH
t SPS
SEM "B"
5675 drw 09
NOTES:
1. D 0R = D 0L = V IL , CE R = CE L = V IH , or Both UB & LB = V IH .
2. All timing is the same for left or right port. “A” may be either left or right port. “B” is the opposite port from “A”.
3. This parameter is measured from R/ W "A" or SEM "A" going HIGH to R/ W "B" or SEM "B" going HIGH.
4. If t SPS is not satisfied there is no guarantee which side will be granted the semaphore flag.
12
6.42
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