TLK3134_1 Datasheet, PDF (40/150 Pages) Texas Instruments – 4-Channel Multi-Rate Transceiver

TLK3134
4-Channel Multi-Rate Transceiver
SLLS838D – MAY 2007 – REVISED JULY 2008
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 2-25. The K28.3 code (referred to as the “A” or alignment code) is transmitted on the
first column following the end of the data packet as shown in Figure 2-26.
The column de-skew state machine is provided in Figure 2-24 . The status of column alignment can be
monitored by reading MDIO registers 4/5.24.12 for global alignment.
RESET
or LOS
UNALIGN
Deskew
Error
Valid
Data
FAIL3
Deskew
Error
||A||
Valid
Data
FAIL2
Deskew
Error
||A||
Valid
Data
FAIL1
||A||
Deskew
Error
Deskew
Error
Deskew
Error
DET1
DET2
||A||
||A||
DET3
Deskew
Error
||A||
ALIGN
||A||
Valid
Data
Valid
Data
Valid
Data
Valid
Data
Note: Deskew Error is at least one column containing an A character, but not all four simultaneously.
Figure 2-24. Column De-Skew State Machine
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Detailed Description
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