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LH521028A Datasheet(PDF) 11 Page - Sharp Corporation |
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LH521028A Datasheet(HTML) 11 Page - Sharp Corporation |
11 / 15 page TIMING DIAGRAMS – WRITE CYCLE Addresses must be stable during unlatched Write cycles. The outputs will remain in the High-Z state if W is LOW when E and SH / SL go LOW. If G is HIGH, the outputs will remain in the High-Z state. Although these examples illustrate timing with G active, it is recom- mended that G be held HIGH for all Write cycles. This will prevent the LH521028’s outputs from becoming active, preventing bus contention, thereby reducing system noise. Write Cycle No. 1 (Unlatched W Controlled Write) Chip is selected: E, G, and SH / SL are LOW, ALE is High. Using only W to control Write cycles may not offer the best performance since both tWHZ and tDW timing specifications must be met. Write Cycle No. 2 (E, SL, SH Controlled Write) G is LOW. DQ lines may transition to Low-Z if the falling edge of W occurs after the falling edge of E, SH/SL if G is LOW. tWC tAW tWP tDW tAH tWLZ tWHZ tAS tDH PREVIOUS OUTPUT VALID DATA VALID ADDRESS 521028-6 W ADDRESS DQ Figure 8. Write Cycle No. 1 tEW ADDRESS E, SL, SH DQ VALID DATA VALID ADDRESS tWC tWP tAH tAS tELZ tWHZ tDW tDH W 521028-7 Figure 9. Write Cycle No. 2 CMOS 64K ×× 18 Static RAM LH521028A 11 |
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