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Section 20 Ethernet Controller (EtherC)
1. When the transmit enable (TE) bit is set, the transmitter enters the transmit idle state.
2. When a transmit request is issued by the transmit E-DMAC, the EtherC sends the preamble to
RMII after a transmission delay equivalent to the time required by carrier detection and a
frame interval time. If full-duplex transfer is selected, which does not require carrier detection,
the preamble is sent as soon as a transmit request is issued by the E-DMAC.
3. The transmitter sends the SFD, data, and CRC sequentially. At the end of transmission, the
transmit E-DMAC generates a transmission complete interrupt (TC). If a collision or the
carrier-not-detected state occurs during data transmission, these are reported as interrupt
sources.
4. After waiting for the frame interval time, the transmitter enters the idle state, and if there is
more transmit data, continues transmitting.
Rev. 1.00 Mar. 12, 2008 Page 778 of 1178
REJ09B0403-0100
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