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Application Notes

Receiver Control

Miscellaneous Receiver States

In addition to the Warm Up and Shut Down states, the FLEXchip IC has four other receiver states. When these settings are applied to the receiver control lines, the FLEXchip IC will be decoding the EXTS1 and EXTS0 input signals. The timing of these signals and their duration depends on the data the FLEXchip IC decodes. Because of this, there is no time setting associated with these settings. The four settings are as follows:

1600 sps Sync Setting—This setting is applied when the FLEXchip IC is searching for a 1600 symbols per second signal.

3200 sps Sync Setting—This setting is applied when the FLEXchip IC is searching for a 3200 symbols per second signal.

1600 sps Data Setting—This setting is applied after the FLEXchip IC has found the C or C sync word in a 1600 symbols per second frame.

3200 sps Data Setting—This setting is applied after the FLEXchip IC has found the C or C sync word in a 3200 symbols per second frame.

Figure C-4 below shows some examples of how these settings will be used in the FLEXchip IC.

FLEX

Block 10

Sync 1

Frame

Sync 2

Block 0

Signal

Info

 

 

 

 

Receiver

Control

Line Setting

Example #1

Receiver

Control

Line Setting

Example #2

1600 sps Data or 3200 sps Data

1600 sps Sync

3200 sps

3200 sps Data

or Last Used Warm Up Setting

Setting

Sync Setting

Setting

 

 

 

 

 

 

 

 

 

 

 

 

 

Possible

Possible

Possible

 

LOBAT

LOBAT

LOBAT

 

Check

Check

Check

 

1600 sps Data or 3200 sps Data

1600sps Sync

 

 

1600 sps Data

or Last Used Warm Up Setting

Setting

 

 

Setting

 

 

 

 

 

 

 

 

 

 

 

 

Possible

 

 

Possible

 

LOBAT

 

 

LOBAT

 

Check

 

 

Check

 

Figure C-4 Examples of Receiver Control Transitions

C-4

MC68175/D, Preliminary

MOTOROLA

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