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UPD720122 Datasheet(PDF) 39 Page - NEC |
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UPD720122 Datasheet(HTML) 39 Page - NEC |
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39 / 82 page  Data Sheet S16685EJ2V0DS 39 µPD720122 2.6.3 AC characteristics of BIU block with function 2 or 3 selected (1) CPU bus read operation Symbol Parameter Min. Typ. Max. Unit TB1 Read cycle time 86 ∞ ns TB2 Address setup time (ALE ↓) 10 ∞ ns TB3 Chip select setup time (ALE ↓) 17 ∞ ns TB4 Read command delay time (ALE ↓) 7 ∞ ns TB5 Output data delay time (RDB ↓) − 57 ns TB6 Read command width 57 ∞ ns TB7 Output data hold time (RDB ↑) 4 − ns TB8 Chip select hold time (RDB ↑) 5 ∞ ns TB9 ALE width 10 ∞ ns TB10 Address hold time (ALE ↓) 0 ∞ ns TB11 Chip select setup time (RDB ↓) 5 ∞ ns TB12 Buffer direction change time (RDB ↓) − 14 ns Remark It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF). CPU bus read timing RDB AD7 to AD0 Note D15 to D8 CSB ADDRES VALID tb7 tb6 tb5 ALE DATA VALID tb2 tb4 tb8 ADDRES VALID tb1 tb9 tb11 tb12 tb10 DATA invalid tb3 Note D7 to D0 for Function 2 |
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