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UPD720122 数据表(PDF) 21 Page - NEC |
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UPD720122 数据表(HTML) 21 Page - NEC |
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21 / 82 page  Data Sheet S16685EJ2V0DS 21 µPD720122 2.6.2 AC characteristics of BIU block with Function 1 selected (1) CPU BUS read operation Symbol Parameter Min. Typ. Max. Unit T1 Read cycle time 91 ∞ ns T2 Address setup time (RDB ↓) 5 ∞ ns T3 Chip select setup time (RDB ↓) 5 ∞ ns T4 Buffer direction change time (RDB ↓) − 14 ns T5 Output data delay time (RDB ↓) − 57 ns T6 Read command width 57 ∞ ns T7 Chip select hold time (RDB ↑) 5 ∞ ns T8 Address hold time (RDB ↑) 5 ∞ ns T9 RDB inactive time 34 ∞ ns T10 Output data hold time (RDB ↑) 4 − ns Remark It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF). CPU bus read timing RDB WRB A7 to A1 D15 to D0 CSB VALID VALID t3 t5 t6 t10 t8 t7 High level INVALID t4 High level t1 t9 t2 |
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