
IDT7026S/L
High-Speed 16K x 16 Dual-Port Static RAM
Military, Industrial and Commercial Temperature Ranges
Timing Waveform of Semaphore Read after Write Timing, Either Side (1)
t SAA
t OH
A 0 -A 2
VALID ADDRESS
VALID ADDRESS
SEM
t AW
t EW
t WR
t SOP
t ACE
t DW
I/O 0
DATA IN
VALID
DATA OUT
VALID (2)
R/ W
OE
t AS
t WP
Write Cycle
t DH
t SWRD
Read Cycle
t AOE
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NOTES:
1. CE = V IH or UB and 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"
SEM "B"
t SPS
MATCH
,
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NOTES:
1. D OR = D OL = V IL , CE R = CE L = V IH , or both UB & LB = V IH .
2. All timing is the same for left and right ports. Port “A” may be either left or right port. Port “B” is the opposite from port “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.
11
6.42