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UPD720122 Datasheet(PDF) 44 Page - NEC |
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UPD720122 Datasheet(HTML) 44 Page - NEC |
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44 / 82 page  Data Sheet S16685EJ2V0DS 44 µPD720122 (a) External local bus 16-bit mode DMA single mode write transfer Symbol Parameter Min. Typ. Max. Unit L16T35 DMA request acknowledge setup time (EP2_WRB ↓) 0 ∞ ns L16T36 DMA request off time 1 (EP2_DACKB ↓) − 54 ns L16T37 DMA single mode write transfer cycle time 88 ∞ ns L16T38 Write command width 54 ∞ ns L16T39 Write command inactive time 34 ∞ ns L16T40 Write data setup time (EP2_WRB ↑) 10 ∞ ns L16T41 Write data hold time (EP2_WRB ↑) 0 ∞ ns L16T42 EP2_TCB setup time (EP2_WRB ↓) 0 Note ns L16T43 EP2_TCB hold time (EP2_WRB ↓) 17 ∞ ns L16T44 DMA request acknowledge hold time (EP2_WRB ↑) 0 ∞ ns Note Can be input after previous EP2_WRB ↑. Remark It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF). (Overall) EP2_DRQB EP2_TCB LD15 to LD0 EP2_WRB EP2_DACKB N cycle N −−−− 1 cycle 1 cycle L16t36 L16t38 L16t37 L16t39 L16t40 L16t41 High level L16t35 L16t44 L16t41 L16t40 |
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