TLK6002 Datasheet, PDF (27/96 Pages) Texas Instruments – Dual Channel 0.47Gbps to 6.25Gbps Multi-Rate Transceiver

TLK6002
www.ti.com
SLLSE34 – MAY 2010
2.16 Receive Datapath Error Condition Operation
The receive datapath (parallel output), when the 8b/10b decoder is enabled, automatically replaces the
received symbol with K30.7 (control = 1, data = 0xFE) in the case of an invalid code word or 8b/10b
disparity error.
The following additional conditions optionally enable replacement of received data with K30.7 (control = 1,
data = 0xFE) (when enabled through MDIO) when 8b/10b decoding is enabled, or replace the parallel
output data with all zero data if the 8b/10b decoder is disabled:
1. Loss of Signal Status – (character replacement enabled through register bit 6.6, disabled by default).
2. Loss of Channel Synchronization Status – (character replacement enabled through register bit 6.5,
disabled by default). This bit should not be enabled unless comma detection is enabled.
Note: Achieving channel synchronization is not possible if register bit 6.6 is high and LOS is detected.
3. Loss of PLL Lock Status – (character replacement enabled through register bit 6.4, disabled by default)
4. GPI1 – (if GPI1=0, character replacement enabled through register bit 6.7, disabled by default)
5. AZDONE – (if AZDONE=0, character replacement enabled through register bit 7.4, disabled by default)
6. AGCLOCK – (if AGCLOCK=0, character replacement enabled through register bit 7.5, disabled by
default)
2.17 Loopback Support
TLK6002 supports several loopback configurations.
Local loopback accepts parallel input data, and returns that data on the parallel output for the same
channel.
Remote loopback accepts serial input data, and returns that data on the serial output for the same
channel.
Shallow local loopback data traverses the entire transmit datapath except for serialization, and is returned
through the entire receive datapath (except for deserialization). Data is not serialized or deserialized.
Deep local loopback data traverses the entire transmit datapath including serialization, and is returned
through the entire receive datapath (including serialization). Data is both serialized and deserialized.
Deep remote loopback data traverses the entire receive datapath including the 20-bit output register, and
is returned through the entire transmit datapath (excluding the parallel input buffers). Data is both
deserialized and serialized.
Shallow remote loopback data traverses the entire receive datapath until just before the 20-bit output
register, and is returned through the entire transmit datapath (excluding the parallel input buffers). Data is
both serialized and deserialized.
Figure 2-9 and Figure 2-10 show all four loopback modes of operation.
Copyright © 2010, Texas Instruments Incorporated
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