mc68181 Freescale Semiconductor, Inc, mc68181 Datasheet - Page 76

• Manufacturer Part Number: mc68181
• Description: Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

MC68181
Host-to-Decoder Packet Descriptions
B-16
INVERT EXTS1 (IS1)
STOP DECODING FRAME (SDF)
RECEIVER SHUTDOWN PACKET ENABLE (RSP)
START NOISE DETECT (SND)
CONTINUOUS NOISE DETECT (CND)
REPORT NOISE DETECTS (RND)
Setting this bit inverts the expected polarity of the
configured by SP
polarity of the EXTS1 pin is untouched). This bit is intended to be changed when a
change in a channel changes the polarity of the received signal. This bit is set and
cleared by the host. The value after reset = 0.
Setting this bit causes the FLEX chip to stop decoding a frame without losing frame
synchronization. This bit is set by the host, and cleared by FLEX chip once it has been
processed. The packet with the SDF bit be sent must be sent after receiving the status
packet with EA bit set. It must be sent within 40 ms of the end of block in which FLEX
chip set the EA bit. The value after reset = 0.
When this bit is set, a Receiver Shutdown Packet will be sent whenever the receiver is
shut down. The receiver shutdown packet informs the host that the receiver
shutdown, and how long it will be before FLEX chip will automatically warm the
receiver back up. The value after reset = 0.
Setting this bit while the FLEX chip is battery saving will cause it to warm-up the
receiver, run a noise detect, and report the result of the noise detect via NDR in the
Roaming Status Packet. This bit is set by the host, and cleared by FLEX chip once it
has been processed. If the time comes for FLEX chip to warm up for automatically or
the SAS bit is set while an SND is being processed, the noise detect will be abandoned
and the abandoned noise detect result (NDR = 01) will be sent in the Roaming Status
Packet. The value after reset = 0.
Setting this bit will cause FLEX chip to do continuous noise detects during the
decoded block data of a frame. The results of the noise detect will only be reported if
noise is detected (NDR = 11). Only one noise detected result (NDR = 11) will be sent
per block. If the FLEX chip has not completed a noise detect when it shuts down for
the frame, that noise detect will be abandoned, but no abandon result (NDR = 01) will
be sent. This bit is set and cleared by the host. (value after reset = 0)
Setting this bit will cause FLEX chip to report the results of the noise detects it does
under normal asynchronous operation (when first turned on and when
asynchronous). The results of the noise detect will be reported via NDR in the
Roaming Status Packet. This bit is set and cleared by the host. The value after
reset = 0.
MC68181 Technical Data Sheet
1
Freescale Semiconductor, Inc.
in the Configuration Packet (e.g. if both IS1 and SP
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EXTS1
pin from the way it is
1
are set, the
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