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AM79C98 Datasheet(PDF) 7 Page - Advanced Micro Devices |
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AM79C98 Datasheet(HTML) 7 Page - Advanced Micro Devices |
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7 / 22 page  Am79C98 7 TEST Test Input, Active HIGH This pin should be tied HIGH for normal operation. If this pin is driven LOW, TPEX will enter Loopback Test mode. The type of loopback is determined by the state of the SQE TEST pin. If this pin is in the LOW state (Station MAU), TPEX transfers data independently from DO to the TXD/TXP circuit and from RXD to the DI circuit. If the SQE TEST is in the HIGH state (Repeater MAU), then data on the RXD circuit is transmitted back onto the TXD/TXP circuit and data on the DO circuit is transmitted onto the DI pair. TXD+, TXD– Transmit Data Output 10BASE-T port differential drivers. TXP+, TXP– Transmit Predistortion Output Transmit waveform predistortion control. XMT Transmit Output This pin is driven HIGH while TPEX is receiving data on the AUI DO pair and is transmitting data on the TXD/ TXP pins. The XMT and RCV pins are simultaneously driven HIGH during collision. |
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