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TE set
Transmission
TE reset
halted
Reset
[Legend]
FDPX: Path for full-duplex mode
HDPX: Path for half-duplex mode
SFD: Start Frame Delimiter
Notes: 1. Retransmission processing includes both jam transmission that depends on collision
detection and the adjustment of transmission intervals based on the back-off algorithm.
2. Retransmission processing is only performed when data of 512 bits or less (including the
preamble and SFD) is transmitted. When a collision is detected during transmission of data
greater than 512 bits, only jam is transmitted and retransmission based on the back-off
algorithm is not performed.
Figure 20.2 EtherC Transmitter State Transitions
FDPX
Idle
Carrier
HDPX
detected
Carrier
detection
Retransmission
processing*
Failure of 15
retransfer attempts
or collision
after 512-bit time
Error detection
Error
notification
Normal transmission
Section 20 Ethernet Controller (EtherC)
Start of transmission
(preamble transmission)
Carrier
not detected
Initiate
retransmission
Collision
Carrier
detection
Carrier
not detected
1
Collision
transmission
Error
Error
transmission
Error
transmission
Rev. 1.00 Mar. 12, 2008 Page 777 of 1178
HDPX
FDPX
SFD
2
Collision*
Data
CRC
REJ09B0403-0100
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