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FX919AD2 데이터시트(PDF) 12 Page - CML Microcircuits

부품명 FX919AD2
상세설명  4-Level FSK Modem Data Pump
PDF  44 Pages
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제조업체  CMLMICRO [CML Microcircuits]
홈페이지  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

FX919AD2 데이터시트(HTML) 12 Page - CML Microcircuits

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4-Level FSK Modem Data Pump
FX919A
© 1996 Consumer Microcircuits Limited
12
D/919A/4
1.5.4
Frame Structure
Figure 7 below shows how an over-air message frame may be constructed from Frame and Symbol Sync
patterns, followed by one or more 'Header', 'Intermediate' or 'Last' blocks.
SYMBOL
SYNC
FRAME
SYNC
FRAME
sent first
last
Over-air
signal
(symbols)
'LAST'
BLOCK
'HEADER'
BLOCK
INTERMEDIATE BLOCKS
66
24
66
66
66
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
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
CRC1
(2 bytes)
Data Bytes
(12)
CRC2
(4 bytes)
Header Block
Last Block
Intermediate Blocks
tri-bits
4-level
symbols
FEC TRELLIS CODING / DECODING
( ERROR CORRECTION )
INTERLEAVING / DE-INTERLEAVING
FRAME
PREAMBLE
-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 : at least 24 symbols of '..+3 +3 -3 -3 ...' sequence
Data Bytes
(10)
Data Bytes
(8)
Figure 7 Over Air Signal Format



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