IDT7025S/L
High-Speed 8K x 16 Dual-Port Static RAM
Military, Industrial and Commercial Temperature Ranges
Timing Waveform of Semaphore Read after Write Timing, Either Side(1)
A0 - A2
SEM
VALID ADDRESS
tAW
tWR
tEW
tSAA
tOH
VALID ADDRESS
tACE
DATA0
R/W
tDW
DATAIN VALID
tSOP
tAS
tWP
tDH
DATA OUT
VALID(2)
tSWRD
OE
Write Cycle
tSOP
Read Cycle
NOTE:
1. CE = VIH or UB & LB = VIH for the duration of the above timing (both write and read cycle).
2. "DATAOUT VALID" represents all I/O's (I/O0-I/O15) equal to the semaphore value.
tAOE
2683 drw 11
Timing Waveform of Semaphore Write Contention(1,3,4)
A0"A"-A2"A"
MATCH
SIDE(2) "A"
R/W"A"
SEM"A"
A0"B"-A2"B"
SIDE(2) "B"
R/W"B"
tSPS
MATCH
SEM"B"
2683 drw 12
NOTES:
1. DOR = DOL = VIL, CER = CEL = VIH, or both UB & LB = VIH.
2. All timing is the same for left and right port. 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 tSPS is not satisfied, there is no guarantee which side will obtain the semaphore flag.
61.432