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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) 41 Page - NEC |
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UPD720122 датащи(HTML) 41 Page - NEC |
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41 / 82 page  Data Sheet S16685EJ2V0DS 41 µPD720122 2.6.4 External local bus (1) External local bus 16-bit mode (a) External local bus 16-bit mode DMA single mode read transfer timing Symbol Parameter Min. Typ. Max. Unit L16T21 DMA request acknowledge setup time (EP1_RDB ↓) 0 ∞ ns L16T22 DMA request off time 1 (EP1_DACKB ↓) − 54 ns L16T23 DMA single mode read transfer cycle time 91 ∞ ns L16T24 Read command width 57 ∞ ns L16T25 Read command inactive time 34 ∞ ns L16T26 Read data delay time (EP1_RDB ↓) − 57 ns L16T27 Buffer direction change time (EP1_RDB ↓) − 14 ns L16T28 Read data hold time (EP1_RDB ↑) 4 − ns L16T29 EP1_TCB setup time (EP1_RDB ↓) 0 Note ns L16T30 EP1_TCB hold time (EP1_RDB ↓) 17 ∞ ns L16T31 EP1_STOPB delay time (EP1_RDB ↓) − 15 ns L16T32 EP1_STOPB delay time (EP1_RDB ↑) 3 − ns L16T33 DMA request acknowledge hold time (EP1_RDB ↑) 0 ∞ ns L16T34 Undefined −− ns Note Can be input after previous EP1_RDB ↑. Remark It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF). |
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