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M68AR024D Datasheet(PDF) 11 Page - STMicroelectronics |
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M68AR024D Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 19 page 11/19 M68AR024D Write Mode The M68AR024D, when Chip Select (E2) is High, is in the Write Mode whenever the W and E1 are Low. Either the Chip Enable Input (E1) or the Write Enable input (W) must be de-asserted during Ad- dress transitions for subsequent write cycles. When E1 or W is Low, and UB or LB is Low, write cycle begins on the W or E1 falling edge. When E1 and W are Low, and UB = LB = High, write cycle begins on the first falling edge of UB or LB. There- fore, address setup time is referenced to Write En- able, Chip Enables and UB/LB as tAVWL, tAVEL and tAVBL respectively, and is determined by the latter occurring falling edge. The Write cycle can be terminated by the earlier rising edge of E1, W, UB and LB. If the Output is enabled (E1 = Low, E2 = High, G = Low, LB or UB = Low), then W will return the out- puts to high impedance within tWLQZ of its falling edge. Care must be taken to avoid bus contention in this type of operation. Data input must be valid for tDVWH before the rising edge of Write Enable, or for tDVEH before the rising edge of E1 or for tD- VBH before the rising edge of UB/LB, whichever occurs first, and remain valid for tWHDX, tEHDX and tBHDX respectively. Figure 10. Write Enable Controlled, Write AC Waveforms AI05991 tAVAV tWHAX tDVWH DATA INPUT A0-A19 E1 W DQ0-DQ15 VALID tAVWH tAVEL tWLWH tAVWL tWLQZ tWHDX tWHQX tBLBH UB, LB E2 tELWH |
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