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Application Notes

Receiver Control

 

 

 

 

 

 

 

3200 sps

 

 

 

 

 

 

 

Sync

 

 

Warm Up

Warm Up

Warm Up

Warm Up

Warm Up

Warm Up

 

 

Time 1

Time 2

Time 3

Time 4

Time5

Time

Receiver

 

Warm Up

Warm Up

Warm Up

Warm Up

Warm Up

3200 sps

Control

Off

Setting 1

Setting 2

Setting 3

Setting 4

Setting 5

Sync Setting

Line Setting

 

 

 

 

 

 

 

 

 

Possible

Possible

Possible

Possible

Possible

Possible

 

 

LOBAT

LOBAT

LOBAT

LOBAT

LOBAT

LOBAT EXTS1 & EXTS0

 

Check

Check

Check

Check

Check

Check

signals are

 

 

 

 

 

 

 

expected to be

 

 

 

 

 

 

 

valid here.

Figure C-2 Receiver Warm Up Sequence When Decoding Turned On

Receiver Shut Down Sequence

The FLEXchip IC allows for up to three steps associated with shutting down the receiver. When the FLEXchip IC decides to turn off the receiver, the first shut down setting, if enabled, is applied to the receiver control lines for the corresponding shut down time. At the end of the last used shut down time, the “Off” setting is applied to the receiver control lines. If the first shut down setting is not enabled, the FLEXchip IC will transition directly from the current “On” setting to the “Off” setting. Figure C-3 shows the receiver turn off sequence when all shut down settings are enabled.

If the receiver is on or being warmed up when the decoder is turned off (by clearing the ON bit in the Control Packet), the FLEXchip IC will execute the receiver shutdown sequence. If the FLEXchip IC is executing the shut down sequence when the FLEXchip IC is turned on (by setting the ON bit in the Control Packet), the FLEXchip IC will complete the shut down sequence before starting the warm up sequence.

 

 

Shut Down

Shut Down

 

 

 

Time 1

Time 2

 

Receiver

1600 sps or 3200 sps

Shut Down

Shut Down

 

Control

Off

Sync or Data Setting

Setting 1

Setting 2

Line Setting

 

 

 

 

 

 

Possible

Possible

Possible

 

 

LOBAT

LOBAT

LOBAT

 

 

Check

Check

Check

 

Figure C-3 Receiver Shut Down Sequence

MOTOROLA

MC68175/D, Preliminary

C-3

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