MC68181 Datasheet, PDF (118/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

MC68181
Freescale Semiconductor, Inc.
Using the Receiver Shutdown Packet
The following formula calculates how long it will take to complete an A-word search
initiated by setting the SAS bit in the roaming control packet. This formula assumes
that the A-word search failed to find roaming FLEX channel.
TimeToPerformAwordSearch ≤ TotalWarmUpTime + AST + 47ms
Where
TotalWarmUpTime
AST
The sum of the times programmed for the used warm
up steps plus the time programmed for the 3200sps Sync
Setting in the receiver control configuration packets.
The value configured using the timing control packet.
Noise Detect / A-word Search
The following formula calculates how long it will take to complete a Noise Detect/A-
word search combination. This can occur when the noise detect is performed while in
asynchronous mode, the noise detect finds FLEX signal, and the DAS bit of the
roaming control packet is not set.
TimeToPerformBoth ≤ TotalWarmUpTime + AST + 127ms
Where
TotalWarmUpTime
AST
The sum of the times programmed for the used warm
up steps plus the time programmed for the 3200sps
Sync Setting in the receiver control configuration
packets.
The value configured using the timing control packet.
C-14
MC68181 Technical Data Sheet
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA