GMSK Modem Data Pump
Page 3 of 37
MX909A PRELIMINARY INFORMATION
1 Block Diagram
DATA
QUALITY
REGISTER
STATUS
REGISTER
IRQ
8
D0
D1
D2
D3
D4
D5
D6
D7
COMMAND
REGISTER
MODE
REGISTER
CONTROL
DATA
BUS
REGISTER
BUFFERS
DATA
BUFFER
CRC
GENERATOR/
CHECKER
FEC
GENERATOR/
CHECKER
WR
RD
ADDRESS
AND
CS
A0
A1
R/W
DECODE
FRAME
INTERLEAVE/
V
DD
SYNC DETECT
DE-INTERLEAVE
V
DD
VBIAS
Rx Bits
Tx Bits
Tx
SCRAMBLE/
VSS
DE-SCRAMBLE
RXAMPOUT
DOC1
DOC2
Rx Input Amp
VBIAS
Rx LEVEL/CLOCK
EXTRACTION
Rx
Tx
Rx
LOW PASS
FILTER
RXIN
XTAL
Tx
TXOUT
CLOCK
OSCILLATOR
AND
Rx
VBIAS
Tx Output Buffer
DIVIDERS
XTAL /
CLOCK
Figure 1: Block Diagram
¤2001 MX-COM, Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480134.005
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