Table of Contents
Advertisement
www.ti.com
TLK3134 reports a fault by outputting a K28.4 (0x9C) on RXD(7:0), 0x00 on RXD(15:8) and RXD(23:16)
and 0x01 for local faults on RXD(31:24). Forwarding of remote faults is handled as a normal transmission.
Note that the TLK3134 will not generate a remote fault indication nor any other type of Q.
2.7.23 Receive Synchronization and Skew Compensation
In XAUI mode, the TLK3134 has a FIFO enabled on the receive data path coming from each serial link to
compensate for channel skew and clock phase and frequency tolerance differences between the
recovered clocks for each channel and the receive output clock RCLK. This FIFO has a depth of 16
locations (32 bits wide for each location).
The de-skew of the 4 serial links that make up each XAUI channel into a single 32 bit wide column of data
is accomplished by alignment of the receive FIFOs on each serial link to a K28.3 control code sent during
the inter-packet gap (IPG) between data packets or during initial link synchronization. Until the alignment
code is recognized by the CTC FIFOs, the output of the FIFOs may be un-aligned and as such undefined,
as shown in
Figure
first column following the end of the data packet as shown in
The column de-skew state machine is provided in
monitored by reading MDIO registers 4/5.24.12 for global alignment.
RESET
or LOS
UNALIGN
||A||
Deskew
DET1
Valid
Data
Note: Deskew Error is at least one column containing an A character, but not all four simultaneously.
Copyright © 2007–2009, Texas Instruments Incorporated
2-25. The K28.3 code (referred to as the "A" or alignment code) is transmitted on the
Valid
Data
Deskew
Error
FAIL3
Deskew
Error
Deskew
Error
Error
DET2
||A||
Valid
Data
Figure 2-24. Column De-Skew State Machine
Submit Documentation Feedback
Product Folder Link(s):
SLLS838F – MAY 2007 – REVISED DECEMBER 2009
Figure
2-26.
Figure 2-24
. The status of column alignment can be
Valid
Data
Deskew
Error
FAIL2
||A||
DET3
||A||
Valid
Data
TLK3134
Valid
Data
Deskew
Error
FAIL1
||A||
Deskew
||A||
Error
ALIGN
||A||
Valid
Data
Detailed Description
TLK3134
39
Advertisement
Table of Contents
