TLK6002 datasheet(27/96 Pages) TI

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TLK6002

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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

both serialized and deserialized.

Figure 2-9 and Figure 2-10 show all four loopback modes of operation.

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