TLK3114SA_13 Datasheet, PDF (26/66 Pages) Texas Instruments – 10-Gbps XAUI Transceiver

The reception of K-characters is reported by the assertion of RDx8 (KFLAG) on each channel. When a code word
error or running disparity error is detected in the decoded data on a channel, RDx9 (ERROR DETECT) and KFLAG
are asserted and an 0xFE is placed on the receive data bus for that channel, as shown in Table 3−6. When a loss
of signal (LOS) is detected on the differential receive inputs, a local fault is reported on the receive data bus (see
Section 3.15, Fault Detection and Reporting). The LOS signal can be disabled using MDIO (see Table 3−13).
EVENT
Normal data
Normal K-character
Loss of signal
Code word error or running disparity error
Table 3−6. Receive Data Controls
RECEIVE DATA BUS (RDX[7:0]) KFLAG (RDX8)
XX
0
Valid K-code (see Table 3−4)
1
See Table 3−7
FE
1
ERROR DETECT (RDX9)
0
0
1
3.13 Channel Initialization and Synchronization
The TLK3114SA device has a synchronization state machine, which is responsible for handling link initialization and
synchronization for each channel. The initialization and synchronization state diagram is provided in Figure 3−7. The
status of any channel can be monitored by reading MDIO registers 4.24 and 5.24, bits 3:0.
RESET
or LOS
Valid Data
or Error
Valid
Data
UNSYNC
Comma
Error
Valid
Data
Comma
ACQ1
Error
ACQ2
Error
MISS3
3 Consecutive
Valid Data
Words
Error
MISS2
Comma
ACQ3
Valid
Data
Error
Comma ^Error
SYNC
Error
MISS1
3 Consecutive
Valid Data
Words
3 Consecutive
Valid Data
Words
Valid Data
or Comma
Figure 3−7. Channel Synchronization State Machine
3−7