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FX929AD2 датащи(PDF) 12 Page - CML Microcircuits

номер детали FX929AD2
подробное описание детали  4-Level FSK Modem Data Pump
PDF  44 Pages
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производитель  CMLMICRO [CML Microcircuits]
домашняя страница  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

FX929AD2 датащи(HTML) 12 Page - CML Microcircuits

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4-Level FSK Modem Data Pump
FX929A
© 1996 Consumer Microcircuits Limited
12
D/929A/4
1.5.4
Frame Structure
The FX929A Frame Structure as used in a RD-LAP system is illustrated in Figure 7, and consists of a Frame
Preamble (comprising a 24-symbol Frame Synchronisation pattern and Station ID block) followed by a 'Header
Block', one or more 'Intermediate Blocks and a 'Last Block'. Channel Status (S) symbols are included at regular
intervals. The first Frame of any transmission is preceded by a Symbol Synchronisation pattern.
SYMBOL
SYNC
FRAME
SYNC
S
STATION
ID
S
FRAME
SYNC
PACKET (1 TO 44 BLOCKS)
FRAME
24
24
22
1
1
1
2
9
10
0
System ID
Domain ID
Base ID
CRC0
7
7
7
0
0
0
0
8
'000'
S
S
22 symbols
22 symbols
S
22 symbols
0
1
20
21
0
1
2
64
65
0
1
2
31
32
7
0 7
0
7
0
Byte 0
Byte 1
Byte 11
'000'
3
4
5
29
30
Block:
7
2
Byte 0
Byte 1
Byte 2
Byte 3
FRAME
PREAMBLE
7
6
5
4
3
2
1
0
Byte 0
Byte 1
Byte 2
Byte 3
7
6
5
4
3
2
1
0
Byte 4
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Byte 0
Byte 1
Byte 2
Byte 3
Byte 10
Byte 11
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Address
&
Control
(10 bytes)
CRC1
(2 bytes)
Data Bytes
(12)
CRC2
(4 bytes)
Pad bytes
(0 - 8)
Data bytes
(0 - 8)
Header Block
Last Block
Station ID
+3
+3
-3
-3
+3
+3
-3
-3
+3
+3
-3
-3
+3
+3
+3
+3
-3
-3
-3
-3
-3
-3
+3
+3
-1
+1
-1
+1
-1
+3
-3
+3
-3
-1
+1
-3
+3
+3
-1
+1
-3
-3
+1
+3
-1
-3
+1
+3
Frame Sync:
Symbol Sync:
sent first
last
'S' : Channel Status Symbol : +3 = Busy +1 = Unknown -1 = Unknown -3 = Idle
Intermediate Blocks
tri-bits
4 -lev el
s y m b ols
69
69
69
69
NEXT FRAME
(OPTIONAL)
FEC TRELLIS CODING / DECODING
( ERROR CORRECTION )
INTERLEAVING / DE-INTERLEAVING
msb
lsb
Over-air
signal
(symbols)
'LAST'
BLOCK
'HEADER'
BLOCK
INTERMEDIATE BLOCKS
FEC TRELLIS CODING / DECODING
( ERROR CORRECTION )
Figure 7 Over Air Signal Format



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