HD6433937 Datasheet, PDF(381/521 Page) Hitachi Semiconductor – Hardware Manual

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HD6433937 Datasheet, PDF (381/521 Pages) Hitachi Semiconductor – Hardware Manual

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12.4.6 Receiver Shutdown Packet

The contents of this section apply to the FLEXâ¢ Roaming Decoder. They are not applicable to

the FLEXâ¢ Non-Roaming Decoder.

The Shutdown Packet is sent in both synchronous and asynchronous mode. It is designed to

indicate to the host that the receiver is turned off and how much time there is until the FLEX

decoder will automatically turn it back on.

Table 12-27 Receiver Shut Down Packet Bit Assignments

Byte 3

Byte 2

Byte 1

Byte 0

Bit 7

0

FNV

TNF 7

FCO

Bit 6

1

CF 6

TNF 6

NAF 6

Bit 5

1

CF 5

TNF 5

NAF 5

Bit 4

1

CF 4

TNF 4

NAF 4

Bit 3

1

CF 3

TNF 3

NAF 3

Bit 2

1

CF 2

TNF 2

NAF 2

Bit 1

1

CF 1

TNF 1

NAF 1

Bit 0

1

CF0

TNF 0

NAF 0

FNV: Frame Number Valid. This bit is set if the last decoded frame info word was correctable and

the frame number was the expected value. When in asynchronous mode, this value will be 0.

CF: Current Frame. When in synchronous mode, this is the current frame number. This value is

latched on the negative edge of the READY line when this packet is sent to the host. The value of

this field is valid only if the FLEX decoder is in synchronous mode and the FIV bit in the status

packet is set. When in asynchronous mode, this value will be 0.

TNF: Time to Next Frame. When in synchronous mode TNF indicates the time to the start of the

A-word check if the FLEX decoder were to warm up for the next frame. When in asynchronous

mode TNF indicates the time to the start of the next automatic noise detect. See âUsing the

Receiver Shutdown Packetâ on page 66 for an explanation on how to use this value. This value is

latched on the negative edge of the READY line when this packet is sent to the host.

FCO: Frame Carried On. Set if the FLEX decoder is decoding the next frame due to the reception

of a non-zero carry-on value in the current or a previous frame. When in asynchronous mode, this

value will be 0.

NAF: Next Assigned Frame. This is the frame number of the next frame the FLEX decoder was

scheduled to decode when the receiver shut down. The value of this field is valid only if the FLEX

decoder is in synchronous mode and the FIV bit in the status packet is set. When in asynchronous

mode this value will be 0.

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