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UPD72012 数据表(PDF) 30 Page - NEC |
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UPD72012 数据表(HTML) 30 Page - NEC |
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30 / 36 page  30 Data Sheet S13918EJ3V0DS µPD72012 (5) HUB EOP delay and EOP skew 50% point of initial swing VSS (b) Downstream EOP delay excluding cable EOP delay: tEOPD = tEOPy − tEHDDx (tEOPy means apply this expression to tEOP– and tEOP+.) EOP skew: tHESK = tEOP+ − tEOP– The low speed timing below is determined by the same method. tLEOPD, tLHESK Upstream end of cable Upstream port or end of cable (c) Downstream EOP delay with and without cable Expansion crossover points Downstream port tEOP- tEOP+ VSS tEOP+ tEOP- Downstream port of HUB VSS tEOP+ tEOP- Downstream end of HUB VSS (a) Downstream EOP delay including cable Expansion crossover points Expansion crossover points Upstream port of HUB VSS VSS |
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