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UPD45128841 数据表(PDF) 30 Page - NEC |
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UPD45128841 数据表(HTML) 30 Page - NEC |
30 / 92 page Data Sheet M12650EJBV0DS00 30 µµµµPD45128441, 45128841, 45128163 11.4 Read to Write Command Interval During a read cycle, READ can be interrupted by WRITE. The Read and Write command interval is 1 cycle minimum. There is a restriction to avoid data conflict. The Data bus must be Hi-Z using DQM before WRITE. D1 D2 D3 D4 READ DQ Command CLK T0 T2 T1 T3 T4 T5 T6 T7 T8 Burst length = 4 WRITE DQM Hi-Z 1cycle READ can be interrupted by WRITE. DQM must be High at least 3 clocks prior to the Write command. CLK T0 T2 T1 T3 T4 T5 T6 T7 T8 Burst length = 8 T9 Q1 Q2 Q3 READ DQ Command D1 D2 D3 WRITE DQM Hi-Z is necessary Q1 Q2 READ DQ Command D1 D2 D3 WRITE DQM Hi-Z is necessary /CAS latency = 2 /CAS latency = 3 |
类似零件编号 - UPD45128841 |
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类似说明 - UPD45128841 |
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