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M68AR128ML70ZB1T Datasheet(PDF) 11 Page - STMicroelectronics |
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M68AR128ML70ZB1T Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 18 page 11/18 M68AR128M Write Mode The M68AR128M is in the Write mode whenever the W and E are Low. Either the Chip Enable input (E) or the Write Enable input (W) must be de- asserted during Address transitions for subsequent write cycles. When E (W) is Low, and UB or LB is Low, write cycle begins on the W (E)'s falling edge. When E and W are Low, and UB = LB = High, write cycle begins on the first falling edge of UB or LB. Therefore, address setup time is referenced to Write Enable, Chip Enable or UB/LB as tAVWL, tAVEL and tAVBL respectively, and is determined by the latter occurring edge. The Write cycle can be terminated by the earlier rising edge of E, W or UB/LB. If the Output is enabled (E = Low, G = Low, LB or UB = Low), then W will return the outputs 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 E, or for tDVBH before the rising edge of UB/LB whichever occurs first, and remain valid for tWHDX, tEHDX and tBHDX respec- tively. Figure 10. Write Enable Controlled, Write AC Waveforms Note: 1. During this period DQ0-DQ15 are in output state and input signals should not be applioed. AI04841 tAVAV tWHAX tDVWH DATA INPUT A0-A16 E W DQ0-DQ15 VALID tAVWH tWLWH tAVWL tWLQZ tWHDX tWHQX tBLWH UB, LB tELWH DATA (1) DATA (1) |
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