mc68181 Freescale Semiconductor, Inc, mc68181 Datasheet - Page 33

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

Frame Data Portion
MOTOROLA
Sync 1 Frame
Frame
127
The 6400 bps rate is transmitted as four concurrent phases of information (A,B, C, and
D), as shown in Figure A-4, at 3200 symbols per second using 4-level FSK
modulation.
As noted above, there are eleven data blocks following the frame synchronization
portion of each frame. Each block has eight interleaved words per phase, numbered
0–87 contiguously for all eleven blocks, in every frame. Each word has information
that allows for bit error correction and detection contained within an error correcting
code.
Each of the eighty-eight words in each phase is organized into the following five
fields:
Frame
Info
0
PHASE A
PHASE B
PHASE C
PHASE D
Freescale Semiconductor, Inc.
Figure A-4 FLEX™ Signal Structure For 6400 BPS
Sync 2
For More Information On This Product,
Frame
1
MC68181 Technical Data Sheet
BIW
Go to: www.freescale.com
Frame
BIW
BIW
BIW
Word Number
2
One Block =
Address
Block 0
160 ms
0 to 7
One Frame = 1.875 s.
Field
One Cycle = 4 Minutes
Address
Frame
Field
3
Address
Address
Field
Field
Vector
Field
Frame
4
Vector
Field
Vector
Vector
Field
Field
Word Number
72 to 79
Block 9
Message Field
Message Field
Frame
125
Message Field Idle Field
Message Field
Frame
126
FLEX Frame Structure
Word Number
Block 10
80 to 87
Idle Field
Frame
127
Field
Idle
MC68181
AA1229
A-5