TLK3118 Datasheet, PDF (10/57 Pages) Texas Instruments – Redundant XAUI Transceiver

TLK3118
Redundant XAUI Transceiver
SLLS628A – DECEMBER 2004 – REVISED APRIL 2005
Channel State Descriptions
RESET
Valid Data
or Error
www.ti.com
Valid
Data
Comma
UNSYNC
Error
Valid
Data
Comma
ACQ1
Error
ACQ2
Error
MISS3
4 Consecutive
Valid Data
Words
Error
MISS2
Comma
ACQ3
Valid
Data
Error
Comma ^Error
SYNC
Error
MISS1
4 Consecutive
Valid Data
Words
4 Consecutive
Valid Data
Words
Valid Data
or Comma
Figure 10. Channel Synchronization State Machine
UNSYNC
This is the initial state for each channel upon device power up or reset. In this state, the TLK3118 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 TLK3118 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 channel state will transition
to the ACQ1 state upon the detection of a comma.
NOTE:
The Lane Sync bit = '0' bit from any/or all channels will cause a local fault to be output
on the receive data bus.
ACQ1
During this state the comma detect circuit is active but code word re-alignment is disabled. The TLK3118 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. 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.
10