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UPD4218165LG5-A60-7JF Datasheet(PDF) 7 Page - NEC |
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UPD4218165LG5-A60-7JF Datasheet(HTML) 7 Page - NEC |
7 / 48 page µPD42S18165L, 4218165L 7 Cautions when using the hyper page mode (EDO) 1. CAS access should be used to operate tHPC at the MIN. value. 2. To make I/Os to Hi-Z in read cycle, it is necessary to control RAS, CAS, WE, OE as follows. The effective specification depends on the state of each signal. (1) Both RAS and CAS are inactive (at the end of read cycle) WE: inactive, OE: active tOFC is effective when RAS is inactivated before CAS is inactivated. tOFR is effective when CAS is inactivated before RAS is inactivated. The slower of tOFC and tOFR becomes effective. (2) Both RAS and CAS are active or either RAS or CAS is active (in read cycle) WE, OE: inactive ····· tOEZ is effective. Both RAS and CAS are inactive or RAS is active and CAS is inactive (at the end of read cycle) WE, OE: active and either tRRH or tRCH must be met ····· tWEZ and tWPZ are effective. The faster of tOEZ and tWEZ becomes effective. The faster of (1) and (2) becomes effective. 3. In read cycle, the effective specification depends on the state of CAS signal when controlling data output with the OE signal. (1) CAS: inactive, OE: active ····· tCHO is effective. (2) CAS, OE: active ····· tOCH is effective. |
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