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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UPD72012 датащи(PDF) 29 Page - NEC |
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UPD72012 датащи(HTML) 29 Page - NEC |
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29 / 36 page  Data Sheet S13918EJ3V0DS 29 µPD72012 (4) HUB differential delay, differential jitter, and SOP distortion 50% point of initial swing VSS Downstream port of HUB Upstream end of cable VSS (b) Downstream HUB delay excluding cable HUB operation jitter: tHDJ1 = tHDDx(J) − tHDDx(K) or tHDDx(K) − tHDDx(J) Continuous transition tHDJ2 = tHDDx(J) − tHDDx(J) or tHDDx(K) − tHDDx(K) Pair transition Bit after SOP width distortion (same as data jitter of next transition of SOP): tFSOP = tHDDx(next J) − tHDDx(SOP) The low-speed timing below is determined by the same method. tLHDD, tLDHJ1, tLDJH2, tLUHJ1, tLUJH2, and tLSOP (a) Downstream HUB delay including cable Downstream end of HUB HUB delay downstream tHDD1 Crossover point 50% point of initial swing HUB delay downstream tHDD2 Upstream port of HUB Crossover point VSS Downstream port of HUB VSS (c) Upstream HUB delay with and without cable Upstream port or end of cable HUB delay upstream tHDD1, tHDD2 Crossover point VSS VSS |
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