GMSK Modem Data Pump
Page 3 of 37
MX909A PRELIMINARY INFORMATION
1 Block Diagram
IRQ
8
D0
D1
D2
D3
D4
D5
D6
D7
WR
RD
CS
A0
A1
V
DD
V
DD
STATUS
REGISTER
DATA
QUALITY
REGISTER
µCONTROLLER
INTERFACE
DATA
BUS
BUFFERS
COMMAND
REGISTER
MODE
REGISTER
CONTROL
REGISTER
DATA
BUFFER
CRC
GENERATOR/
CHECKER
ADDRESS
AND
R/W
DECODE
FEC
GENERATOR/
CHECKER
INTERLEAVE/
DE-INTERLEAVE
FRAME
SYNC DETECT
V
BIAS
Tx Bits
V
SS
SCRAMBLE/
DE-SCRAMBLE
Rx Bits
RXAMPOUT
Rx Input Amp
V
BIAS
RXIN
XTAL
CLOCK
OSCILLATOR
AND
DIVIDERS
XTAL /
CLOCK
Rx
Tx
LOW PASS
FILTER
Rx
Tx
Tx
Rx
DOC1
Rx LEVEL/CLOCK
EXTRACTION
DOC2
TXOUT
Tx Output Buffer
V
BIAS
Figure 1: Block Diagram
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