Datasheet

Section 20 Ethernet Controller (EtherC)
Rev. 2.00 Aug. 20, 2008 Page 777 of 1198
REJ09B0403-0200
FDPX
FDPX
HDPX
HDPX
Collision
Collision
Collision*
2
Error
Error
Error
Normal transmission
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.
Error
notification
Transmission
halted
Start of transmission
(preamble transmission)
Carrier
detected
Carrier
detection
SFD
transmission
CRC
transmission
Data
transmission
Carrier
detection
Failure of 15
retransfer attempts
or collision
after 512-bit time
Retransmission
processing*
1
Error detection
Carrier
not detected
Carrier
not detected
Idle
TE set
TE reset
Reset
[Legend]
FDPX: Path for full-duplex mode
HDPX: Path for half-duplex mode
SFD: Start Frame Delimiter
Initiate
retransmission
Figure 20.2 EtherC Transmitter State Transitions