mc68181 Freescale Semiconductor, Inc, mc68181 Datasheet - Page 29

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

FLEX SIGNAL STRUCTURE
MOTOROLA
Sync 1 Frame
Frame
127
This appendix gives an overview of the FLEX protocol as it pertains to the Roaming
FLEX chip IC. This is only an overview and in the event that there is contradictory
information, the FLEX Protocol Specification prevails. This overview is derived from
Issue G1.8 of the FLEX Protocol Specification.
As shown in Figure A-1, a FLEX signal is transmitted on a radio channel and consists
of a series of four-minute cycles, each cycle having 128 frames at 1.875 seconds per
frame. A pager may be assigned to process any number of these frames. Any
unassigned frames are not processed, thus reducing power required for signal
processing and extending battery life. If required, however, the pager may
temporarily process more complex information, because individual FLEX cycles can
assign additional frames dynamically using collapse, fragmentation, temporary
addressing, or carry-on information within the FLEX signal.
Frame
Info
0
Freescale Semiconductor, Inc.
Sync 2
For More Information On This Product,
Frame
1
MC68181 Technical Data Sheet
FLEX OVERVIEW
Figure A-1 FLEX™ Signal Structure
Go to: www.freescale.com
Frame
Word Number
2
APPENDIX A
One Block =
Block 0
160 ms
0 to 7
One Frame = 1.875 s.
One Cycle = 4 Minutes
Frame
3
Frame
4
Word Number
72 to 79
Block 9
Frame
125
Frame
126
Word Number
Block 10
80 to 87
Frame
127
AA1226
A-1