Datasheet

DP83849IF
SNOSAX8D –JUNE 2009–REVISED APRIL 2013 www.ti.com
7.4.9 Transmitter
The encoder begins operation when the Transmit Enable input (TX_EN) goes high and converts NRZ data
to pre-emphasized Manchester data for the transceiver. For the duration of TX_EN, the serialized
Transmit Data (TXD) is encoded for the transmit-driver pair (PMD Output Pair). TXD must be valid on the
rising edge of Transmit Clock (TX_CLK). Transmission ends when TX_EN deasserts. The last transition is
always positive; it occurs at the center of the bit cell if the last bit is a one, or at the end of the bit cell if the
last bit is a zero.
7.4.10 Receiver
The decoder detects the end of a frame when no additional mid-bit transitions are detected. Within one
and a half bit times after the last bit, carrier sense is de-asserted. Receive clock stays active for five more
bit times after CRS goes low, to ensure the receive timings of the controller.
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