CMX469A Ver la hoja de datos (PDF) - CML Microsystems Plc
Número de pieza
componentes Descripción
Fabricante
CMX469A Datasheet PDF : 16 Pages
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1200/2400/4800 Baud FFSK/MSK Modem
Interface Timing Diagrams
CMX469A
Tx
ENABLE
tESET
Tx
SYNC
t DSET
Tx DATA DC = Don't Care
DC
DV
DV = Data Valid
t DH
DC
t TxD
1200 BAUD
Tx OUTPUT
OPEN CIRCUIT
t TDR
tTDR
DV
DC
DV
DC
2400 BAUD
Tx OUTPUT
OPEN CIRCUIT
OPEN CIRCUIT
OPEN CIRCUIT
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 I/P
2400/4800 BAUD
LOGIC '1'
LOGIC '0'
Rx
SIGNAL I/P
1200 BAUD
1
Rx
SYNC O/P
(1200Hz)
0
1
CLOCKED
DATA O/P
0
t ID
t RDR
Undetermined
State
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
© 2001 Consumer Microcircuits Limited
13
D/469A/2
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