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71342SA20PFGI8 Datasheet(PDF) 10 Page - Integrated Device Technology |
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71342SA20PFGI8 Datasheet(HTML) 10 Page - Integrated Device Technology |
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10 / 14 page  6.42 IDT71342SA/LA High-Speed 4K x 8 Dual-Port Static RAM with Semaphore Industrial and Commercial Temperature Ranges 10 Timing Waveform of Semaphore Read After Write Timing, Either Side(1) NOTE: 1. CE = VIH for the duration of the above timing (both write and read cycle). NOTES: 1. D0R = D0L = VIL, CER = CEL = VIH, Semaphore Flag is released from both sides (reads as ones from both sides) at cycle start. 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 the point where R/W "A" or SEM "A" goes HIGH until R/W "B" or SEM "B" goes HIGH. 4. If tSPS is violated, the semaphore will fall positively to one side or the other, but there is no guarantee which side will obtain the flag. Timing Waveform of Semaphore Condition(1,3,4) A0 -A2 VALID ADDRESS VALID ADDRESS DATAIN VALID DATAOUT VALID SEM R/ W OE DATA0 tAW tEW tWR tDW tDH tWP tAS tSWRD tSOP tAOE tACE tSAA tOH tSOP Test Cycle (Read Cycle) Write Cycle 2721 drw 12 A0"A" -A2"A" tSPS R/ W"A" SEM"A" SIDE (2) "A" A0"B" -A2"B" R/ W"B" SEM"B" SIDE (2) "B" MATCH MATCH 2721 drw 13 |
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