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Valid
Data
ACQ2
2.7.20 Channel State Descriptions:
UNSYNC
This is the initial state for each channel upon device power up or reset. In this state, the
TLK3134 will have the comma detect circuit active and will make code word alignment
adjustments based on the position of a comma in the incoming data stream. While in this
state the TLK3134 will set the Lane Sync bit to '0' for the particular channel in MDIO register
bits 4/5.24.3:0 indicating the lane is not synchronized.
the ACQ1 state upon the detection of a comma.
ACQ1
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 in the same code
word alignment position as found in state UNSYNC or a decode error is encountered. While
in this state, the Lane Sync bit for the particular channel will remain de-asserted indicating
the lane is not synchronized.
state to UNSYNC. A detected comma will cause the channel state to transition to ACQ2.
ACQ2
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 in the same code
word alignment position as found in state UNSYNC or a decode error is encountered. While
in this state, the Lane Sync bit for the particular channel will remain de-asserted indicating
the lane is not synchronized.
state to UNSYNC. A detected comma will cause the channel state to transition to ACQ3.
(1) The Lane Sync bit = '0' bit from any/or all channels will cause a local fault to be output on the receive data bus.
Copyright © 2007–2009, Texas Instruments Incorporated
reset
comma
Valid
Data
ACQ1
Error
comma
Error
comma
ACQ3
comma
Valid
Data
Figure 2-22. Channel Synchronization State Machine
(1)
(1)
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SLLS838F – MAY 2007 – REVISED DECEMBER 2009
Valid Data
or Error
UNSYNC
Error
MISS3
Error
Error
Error
MISS1
Error
4 Consecutive
Valid Data
Words
SYNC
Valid Data
or Comma
(1)
A decode or running disparity error will return the channel
A decode or running disparity error will return the channel
TLK3134
4 Consecutive
Valid Data
Words
MISS2
4 Consecutive
Valid Data
Words
The channel state will transition to
Detailed Description
TLK3134
37
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