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| 型號： | CMX469AP6 |
| 英文描述： | MODEM |
| 中文描述： | 調(diào)制解調(diào)器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 475K |
| 代理商： | CMX469AP6 |
1200/2400/4800 Baud FFSK/MSK Modem
CMX469A
2001 Consumer Microcircuits Limited
13
D/469A/2
Interface Timing Diagrams
Tx
ENABLE
STx
Tx
DATA
2400
Tx
BAUD
OUTPUT
1200
Tx
BAUD
OUTPUT
OPEN
CIRCUIT
OPEN
CIRCUIT
OPEN
CIRCUIT
OPEN
CIRCUIT
DC
DV
=
=
Don't
Data
Care
Valid
DV
DC
DV
DC
DV
DC
DC
t
ESET
t
TxD
t
DSET
t
DH
t
TDR
t
TDR
TX DATA must be valid at the time of the rising edge of TX SYNC.
Therefore the optimum time to change TX DATA is on the falling edge of TX SYNC.
Figure 4 Transmitter Timing
Rx
SIGNAL
1200
I/P
BAUD
Rx
SIGNAL
2400/4800
I/P
BAUD
Rx
SYNC
(1200Hz)
O/P
CLOCKED
DATA
O/P
1
1
0
0
LOGIC
'1'
t
ID
t
RDR
Undetermined
State
LOGIC
'0'
LOGIC
'1'
LOGIC
'0'
The optimum time to sample the CLOCKED DATA O/P is on the falling edge of RX SYNC O/P.
Figure 5 Receiver Timing
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