2.7.21 End Of Packet Error Detection; 2.7.22 Fault Detection And Reporting - Texas Instruments TLK3134 Data Manual

TLK3134
SLLS838F – MAY 2007 – REVISED DECEMBER 2009
ACQ3 During this state the comma detect circuit is active but code word re-alignment is disabled.
The TLK3134 will remain in this state until either a comma is detected or a decode error
encountered. While in this state, the Lane Sync bit for the particular channel will remain
de-asserted indicating the lane is not synchronized.
return the channel state to UNSYNC. A detected comma will cause the channel state to
transition to SYNC.
SYNC This is the normal state for receiving data. When in this state, the TLK3134 will set the Lane
Sync bit to '1' for the particular channel in the MDIO register bits 4/5.24.3:0 indicating the
lane has been synchronized. During this state the comma detect circuit is active but code
word re-alignment is disabled. A decode or running disparity error will cause the channel
state to transition to MISS1.
MISS1 When entering this state an internal error counter is cleared. If the next four consecutive
codes are decoded without error, the channel state reverts back to SYNC. If a decode or
running disparity error is detected, the channel state will transition to MISS2.
MISS2 When entering this state an internal error counter is cleared. If the next four consecutive
codes are decoded without error, the channel state reverts back to MISS1. If a decode or
running disparity error is detected, the channel state will transition to MISS3.
MISS3 When entering this state an internal error counter is cleared. If the next four consecutive
codes are decoded without error, the channel state reverts back to MISS2. If a decode or
running disparity error is detected, the channel state will transition to UNSYNC.

2.7.21 End of Packet Error Detection

Because of their unique data patterns, /A/ (K28.3), /K/ (K28.5), and /T/ (K29.7) will catch running disparity
errors that may have propagated undetected from previous codes in a packet. Running disparity errors
detected by these control codes at the end of packets will cause the previous data codes to be reported
as errors (0xFE) to allow the protocol device to reject the packet (see
...
RDP/N0
...
RDP/N1
...
RDP/N2
...
RDP/N3
D = Data, T = K29.7, A = K28.3, K = K28.5, E = Error (0xFE), I = Idle

2.7.22 Fault Detection and Reporting

The TLK3134 will detect and report local faults as well as forward both local and remote faults as defined
in the IEEE 802.3ae 10Gbps Ethernet Standard to aid in fault diagnosis. All faults detected by the
TLK3134 are reported as local faults to the upper layer protocols. Once a local fault is detected in the
TLK3134, MDIO register bit 4/5.1.7 is set. Fault sequences, sequence ordered sets received by the
TLK3134, either on the Transmit Data Bus or on the high speed receiver pins, are forwarded without
change to the MDIO registers in the TLK3134. Also, note that the TLK3134 is capable of performing CTC
operation where only RF and LF or any Q sequences are transported (not generated) in either the transmit
or receive direction in XAUI mode.
38 Detailed Description
XAUI
Running Disparity Error
D D D D A
Detected by /A/ Yields
Running Disparity Error
D D D T A
Detected by /T/ Yields
Running Disparity Error
D D D K A
Detected by /K/ Yields
Running Disparity Error
D D D K A
Detected by /K/ Yields
Figure 2-23. End of Packet Error Detection
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A decode or running disparity error will
Figure 2-23).
XGMII
D
... D
... D D
D
... D
... D D
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