TLK3118 Datasheet, PDF (17/57 Pages) Texas Instruments – Redundant XAUI Transceiver

www.ti.com
TLK3118
Redundant XAUI Transceiver
SLLS628A – DECEMBER 2004 – REVISED APRIL 2005
RDP/N0
Any Valid
Code
K28.3
K28.5
K28.0
RR 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 KRRRRRRRRRRK
RDP/N1
RRX 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 KRRRRRRRR
RDP/n2 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
RDP/N3
RRX 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 KRRRRRRRRRR
RCLK
RXD(7:0)
RXD(15:8)
RXD(23:16)
RXD(31:24)
Undefined
Undefined
A
K
Undefined
Undefined
A
K
Undefined
Undefined
A
K
Undefined
Undefined
A
K
Figure 15. Channel Synchronization Using Alignment Code
Clock Tolerance Compensation (CTC)
The XAUI interface is defined to allow for separate clock domains on each side of the link. If the reference clocks
difference for two devices on a XAUI link is not compensated for, it will lead to over or under run of the FIFO’s on
the receive/transmit data path. The TLK3118 provides compensation for these differences in clock frequencies
via the insertion or the removal of /R/ characters on all channels, as shown in Figure 16 and Figure 17.
17