MC68181 Datasheet, PDF (109/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

Freescale Semiconductor, Inc.
MC68181
Message Building
FLEX
Signal
Block 10
Sync 1
Frame
Info
Sync 2
Block 0
Receiver
Control
Line Setting
Example #1
1600 sps Data or 3200 sps Data
or Last Used Warm Up Setting
1600 sps Sync
Setting
3200 sps
Sync Setting
3200 sps Data
Setting
Possible
LOBAT
Check
Possible
LOBAT
Check
Possible
LOBAT
Check
1600 sps Data or 3200 sps Data
Receiver _{or Last Used Warm Up Setting}
Control
Line Setting
Example #2
Possible
LOBAT
Check
1600sps Sync
Setting
Possible
LOBAT
Check
Figure C-4 Examples of Receiver Control Transitions
1600 sps Data
Setting
AA1239
Low Battery Detection
The FLEXchip IC can be configured to poll the LOBAT input pin at the end of every
receiver control setting. This check can be enabled or disabled for each receiver
control setting. If the poll is enabled for a setting, the pin will be read just before the
FLEXchip IC changes the receiver control lines from that setting to another setting.
The FLEXchip IC will send a Status Packet whenever the value on two consecutive
reads of the LOBAT pin yields different results.
MESSAGE BUILDING
A simple message consists of an Address Packet followed by a Vector Packet
indicating the word numbers of associated Message Packets.The tables below show a
more complex example of receiving three Messages and two Block Information Word
Packets in the first two blocks of a 2 phase 3200 bps, FLEX frame.
Note: The messages shown may be portions of fragmented or group messages.
Furthermore, in the case of a 6400 bps FLEX signal, there would be four
phases: A, B, C and D, and in the case of a 1600 bps signal there would be only
a single phase A.
Table C-1 on page 6 shows the block number, Word Number (WN) and word
content of both phases A and C. Note contents of words not meant to be received by
the host are left blank. Each phase begins with a block information word (WN 0), that
MOTOROLA
MC68181 Technical Data Sheet
C-5
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