TLK3134_1 Datasheet, PDF (38/150 Pages) Texas Instruments – 4-Channel Multi-Rate Transceiver

TLK3134
4-Channel Multi-Rate Transceiver
SLLS838D – MAY 2007 – REVISED JULY 2008
Valid
Data
reset
Valid Data
or Error
comma
UNSYNC
Error
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Valid
Data
comma
ACQ1
Error
ACQ2
Error
Error
MISS3
4 Consecutive
Valid Data
Words
Error
MISS2
comma
ACQ3
Valid
Data
Error
MISS1
comma
Error
SYNC
4 Consecutive
Valid Data
Words
4 Consecutive
Valid Data
Words
Valid Data
or Comma
Figure 2-22. Channel Synchronization State Machine
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.⁽¹⁾ The channel state will transition to
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.⁽¹⁾ A decode or running disparity error will return the channel
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.⁽¹⁾ A decode or running disparity error will return the channel
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.
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Detailed Description
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