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DP83902AVF 数据表(PDF) 63 Page - National Semiconductor (TI) |
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DP83902AVF 数据表(HTML) 63 Page - National Semiconductor (TI) |
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63 / 70 page ![]() 150 Switching Characteristics AC Specs DP83902A Note All Timing is Preliminary (Continued) Remote DMA (Write Cycle) TLF11157 – 44 Symbol Parameter Min Max Units bprqh Bus Clock to Port Request High (Note 1) 42 ns wprql WACK to Port Request Low 52 ns wackw WACK Pulse Width 25 ns bprdl Bus Clock to Port Read Low (Note 2) 55 ns bprdh Bus Clock to Port Read High 40 ns Note 1 The first port request is issued in response to the remote write command It is subsequently issued on T1 clock cycles following completion of remote DMA cycles Note 2 The start of the remote DMA write following WACK is dependent on where WACK is issued relative to BSCK and whether a local DMA is pending 63 |
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