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HSDL-3603 Datasheet(PDF) 4 Page - Agilent(Hewlett-Packard) |
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HSDL-3603 Datasheet(HTML) 4 Page - Agilent(Hewlett-Packard) |
4 / 24 page ![]() 4 Bandwidth Selection Timing The transceiver is in default SIR/ MIR mode when powered on. User needs to apply the following programming sequence to both the SD and TXD inputs to enable the transceiver to operate at FIR mode. Figure 3. Bandwidth selection timing at SIR/MIR mode. Figure 4. Bandwidth selection timing at FIR mode. Setting the transceiver to SIR/MIR Mode (9.6 kb/s to 1.152 Mbit/s) 1. Set SD/Mode input to logic HIGH 2. TXD input should remain at logic LOW 3. After waiting for tS ≥ 25 ns, set SD/Mode to logic LOW, the HIGH to LOW negative edge transition will determine the receiver bandwidth 4. Ensure that TXD input remains low for tH ≥ 100 ns, the receiver is now in SIR/MIR mode 5. SD input pulse width for mode selection should be > 50 ns. VIH 50% tS tH VIL 50% 50% TXD SD/MODE VIL VIH 50% tS tH VIL 50% 50% TXD SD/MODE VIH VIL Setting the transceiver to FIR (4.0 Mbit/s) Mode 1. Set SD/Mode input to logic HIGH 2. After SD/Mode input remains HIGH at > 25ns, set TXD input to logic HIGH, wait tS ≥ 25 ns (from 50% of TXD rising edge till 50% of SD falling edge) 3. Then set SD/Mode to logic LOW, the HIGH to LOW negative edge transition will determine the receiver bandwidth 4. After waiting for tH ≥ 100ns, set the TXD input to logic LOW 5. SD input pulse width mode selection should be > 50ns. |
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