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M4T32-BR12SH Datasheet(PDF) 9 Page - STMicroelectronics |
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M4T32-BR12SH Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 29 page  9/29 M48T37Y, M48T37V WRITE Mode The M48T37Y/V is in the WRITE Mode whenever W and E are low. The start of a WRITE is refer- enced from the latter occurring falling edge of W or E. A WRITE is terminated by the earlier rising edge of W or E. The addresses 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 anoth- er READ or WRITE cycle. Data-in must be valid tD- VWH prior to the end of WRITE and remain valid for tWHDX afterward. G should be kept high during WRITE cycles to avoid bus contention; however, 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 AI00926 tAVAV tWHAX tDVWH DATA INPUT A0-A14 E W DQ0-DQ7 VALID tAVWH tAVEL tWLWH tAVWL tWLQZ tWHDX tWHQX AI00927 tAVAV tEHAX tDVEH A0-A14 E W DQ0-DQ7 VALID tAVEH tAVEL tAVWL tELEH tEHDX DATA INPUT |
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