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M48TY-85PM1 Datasheet(PDF) 8 Page - STMicroelectronics |
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M48TY-85PM1 Datasheet(HTML) 8 Page - STMicroelectronics |
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8 / 22 page  M48T128Y, M48T128V* 8/22 WRITE Mode The M48T128Y/V is in the WRITE Mode whenever W (WRITE Enable) and E (Chip Enable) are low state after the address inputs are stable. The start of a WRITE is referenced from the latter occurring falling edge of W or E. A WRITE is termi- nated by the earlier rising edge of W or E. The ad- dresses must be held valid throughout the cycle. E or W must return high for a minimum of tEHAX from Chip Enable or tWHAX from WRITE Enable prior to the initiation of another READ or WRITE cycle. Data-in must be valid tDVWH prior to the end of WRITE and remain valid for tWHDX afterward. G should be kept high during WRITE cycles to avoid bus contention; although, if the output bus has been activated by a low on E and G a low on W will disable the outputs tWLQZ after W falls. Figure 6. WRITE Enable Controlled, WRITE AC Waveform Figure 7. Chip Enable Controlled, WRITE AC Waveforms AI02382 tAVAV tWHAX tDVWH DATA INPUT A0-A16 E W DQ0-DQ7 VALID tAVWH tAVEL tWLWH tAVWL tWLQZ tWHDX tWHQX AI02383 tAVAV tEHAX tDVEH A0-A16 E W DQ0-DQ7 VALID tAVEH tAVEL tAVWL tELEH tEHDX DATA INPUT |
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