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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UPD720122 датащи(PDF) 62 Page - NEC |
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UPD720122 датащи(HTML) 62 Page - NEC |
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62 / 82 page  Data Sheet S16685EJ2V0DS 62 µPD720122 (d) External local bus 8-bit mode DMA demand write transfer timing Symbol Parameter Min. Typ. Max. Unit L8T58 DMA request acknowledge setup time (EP2_WRB ↓) 0 ∞ ns L8T59 DMA demand mode write transfer cycle time 72 ∞ ns L8T60 Write command width 38 ∞ ns L8T61 Write command inactive time 34 ∞ ns L8T62 Write data setup time (EP2_WRB ↑) 10 ∞ ns L8T63 Write data hold time (EP2_WRB ↑) 0 ∞ ns L8T66 DMA request off time (EP2_WRB ↑) − 60 ns L8T67 DMA request acknowledge hold time (EP2_WRB ↑) 0 ∞ ns Remarks 1. Use of EP1_TCB is prohibited in the 8-bit external local bus mode. Clamp this signal to the inactive status. 2. LD15 to 8 are undefined in the 8-bit external local bus mode (these signals are invalid when input and undefined when output). 3. It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF). (Overall) EP2_DRQB EP2_TCB LD7 to LD0 EP2_WRB EP2_DACKB N cycle N −−−− 1 cycle 1 cycle L8t59 L8t60 L8t61 L8t62 L8t63 L8t66 High level L8t67 L8t62 L8t63 L8t58 |
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