IDT7007S/L
High-Speed 32K x 8 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
DATA 0
t AW
t WR
t EW
t DW
DATA IN VALID
t SOP
t ACE
DATA OUT
VALID (2)
R/ W
t AS
t WP
t DH
OE
t SWRD
t SOP
t AOE
Write Cycle
Read Cycle
2940 drw 11
NOTE:
1. CE = V IH for the duration of the above timing (both write and read cycle).
Timing Waveform of Semaphore Write Contention (1,3,4)
A 0"A" -A 2"A"
MATCH
SIDE
(2)
SIDE
(2)
"A"
"B"
R/ W "A"
SEM "A"
A 0"B" -A 2"B"
R/ W "B"
SEM "B"
MATCH
t SPS
2940 drw 12
NOTES:
1. D OR = D OL = V IL , CE R = CE L = V IH .
2. All timing is the same for left and right ports. Port "A" may be either left or right 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, the semaphore will fall positively to one side or the other, but there is no guarantee which side will obtain the flag.
12
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