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COM90C66 Datasheet(PDF) 69 Page - SMSC Corporation |
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COM90C66 Datasheet(HTML) 69 Page - SMSC Corporation |
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69 / 76 page  69 BALE A19 A18 A17 A16 A15 A14 A13 A12 A11 Transparent Latch Comparator 5 to 7 Decoder MS4 MS3 MS2 MS1 MS0 MEMORY SELECT BALE A19 A18 A17 A16 A15 A14 MS4 MS3 MS2 MS1 MS0 Transparent Latch Comparator 5 to 9 Decoder nENROM PROM DECODE A13* * In I/O 16K X 8 Mode, A13 is a Don't Care FIGURE 4 - MEMORY SELECTOR FIGURE 5 - PROM SELECTOR Transparent Latch nMEMR,nMEMW Transparent Latch nMEMR WAIT STATE BIT IOCHRDY nOWS 0 1 logic "1" Activated on Access Negated for Two to Three XTAL1 Clocks logic "1" Modified Version of Pages 16 and 41 for Rev. D COM90C66 Only. TABLE 13 - IOCHRDY and nOWS Signal Behavior |
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