TLK3114SA_13 Datasheet, PDF (34/66 Pages) Texas Instruments – 10-Gbps XAUI Transceiver

RXAP/RXAN
Any Valid
Code
K28.3
K28.5
K28.0
RRXXXXXXXXXXAAAAAAAAAAKKKKKKKKKKRRRRRRRRRRKKKK
RXBP/RXBN
RRXXXXXXXXXXAAAAAAAAAAKKKKKKKKKKRRRRRRRRRRKKKK
RXCP/RXCN R R X X X X X X X X X X A A A A A A A A A A K K K K K K K K K K R R R R R R R R R R K K K K
RXDP/RXDN
RRXXXXXXXXXXAAAAAAAAAAKKKKKKKKKKRRRRRRRRRRKKKK
RCA
RDA[9:0]
Undefined
Undefined
A
K
R
RDB[9:0]
Undefined
Undefined
A
K
R
RDC[9:0]
Undefined
Undefined
A
K
R
RDD[9:0]
Undefined
Undefined
A
K
R
Figure 3−14. Channel Synchronization Using Alignment Code
3.19 Clock Tolerance Compensation (CTC)
The XAUI interface is defined to allow for separate clock domains on each side of the link. Though the reference clocks
for two devices on a XAUI link have the same specified frequencies, there are slight differences within those limits
that, if not compensated for, lead to over- or underruns of the FIFOs on the receive data path. The TLK3114SA device
provides compensation for these differences in reference clock frequencies via the insertion or the removal of /R/
characters on all channels, as shown in Figure 3−15 and Figure 3−16. Bit 11 of MDIO register 16 allows enabling of
the CTC, as noted in Table 3−18.
3−15