MC68181 Datasheet, PDF (77/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

Freescale Semiconductor, Inc.
MC68181
Host-to-Decoder Packet Descriptions
ALL BLOCK INFORMATION WORDS (ABI)
When this bit is set, FLEX chip will send all received Block Information words 2–4 to
the host. Note: Setting the SBI bit in the Control Packet only enables errored and real
time clock related block info words. The value after reset = 0.
START A-WORD SEARCH (SAS)
Setting this bit while in asynchronous battery save mode will cause FLEX chip to
warm-up the receiver, and run an A-word search. If, during the A-word search, the
FLEX chip IC finds sufficient FLEX signal, it will enter synchronous mode and start
decoding the frame. If the A-word search times-out without finding sufficient FLEX
signal, it will battery save and continue doing periodic noise detects. The time-out for
the A-word searches is controlled by the AST bits in the Timing Control Packet and
the MOT bit in the Configuration Packet. The A-word search takes priority over noise
detects. Therefore, if FLEX chip is performing an A-word search and the time comes
to do automatic noise detect, the noise detect will not be performed. This bit is set by
the host, and cleared by FLEX chip once it has been acted on. The value after reset = 0.
DISABLE A-WORD SEARCH (DAS)
When this bit is set, an A-word search will not automatically occur after a noise detect
in asynchronous mode finds FLEX signal. This includes automatic noise detects and
noise detects initiated by the host by setting SND. FLEX chip will shut down the
receiver after the noise detect completes regardless of the result. When this bit is
cleared, A-word searches will occur after a noise detect finds signal in asynchronous
mode. The value after reset = 0.
MFC:MISSED FRAME CONTROL (MFC)
These bits control the frames for which missing frame data (MS1, MFI, MS2, MBI, and
MAW) is reported in the Roaming Status Packet. The value after reset = 0.
Table 2-11 Missed Frame Control Bit Definitions
MFC₁ MFC_{0 Missing Frame Data Reported}
0
0
Never
0
1
Only during frames 0 through 3
1
0
Only during frames 0 through 7
1
1
Always
MAXIMUM CARRY ON (MCO)
The value of these bits sets the maximum carry on that FLEX chip will follow. For
example, if FLEX chip receives a carry on of 3 over the air and MCO is set to 1, FLEX
chip will only carry on for one frame. The value after reset = 0.
MOTOROLA
MC68181 Technical Data Sheet
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