CMX969D5 MX-COM, Inc., CMX969D5 Datasheet - Page 2

• Manufacturer Part Number: CMX969D5
• Description: MOTIENT/ARDIS RD-LAP MDC4800 Modem
• Manufacturer: MX-COM, Inc.

MOTIENT
Section
1 Block Diagram ............................................................................................................... 4
2 Signal List ...................................................................................................................... 5
3 External Components ................................................................................................... 6
4 General Description ...................................................................................................... 7
¤ ¤ ¤ ¤ 2001 MX-COM, Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
4.1
4.2
4.3
4.4
4.5
4.6
SM
/ARDIS
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
4.1.9
4.1.10 Rx Input Amp .......................................................................................................................... 8
4.1.11 Low Pass Filter ....................................................................................................................... 8
4.1.12 Tx Output Buffer...................................................................................................................... 8
4.1.13 Clock Oscillator and Dividers.................................................................................................. 8
4.4.1
4.4.2
4.5.1
4.5.2
4.5.3
4.5.4
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.6.6
Description of Blocks ......................................................................................................... 7
Modem - µC Interaction ..................................................................................................... 9
Binary to RD-LAP 4-Level Symbol Translation................................................................... 9
Frame Structure............................................................................................................... 10
The Programmer's View................................................................................................... 12
CMX969 Modem Tasks ................................................................................................... 16
SM
Data Bus Buffers..................................................................................................................... 7
Address and R/W Decode ...................................................................................................... 7
Status and Data Quality Registers.......................................................................................... 7
Command, Mode and Control Registers ................................................................................ 7
Data Buffer.............................................................................................................................. 7
CRC Generator/Checker ........................................................................................................ 7
FEC Encoder/Decoder............................................................................................................ 7
Interleave/De-interleave Buffer ............................................................................................... 8
Auto Frame Sync Detect, Rx Level & Timing Extraction, Rx Data Symbol Extraction........... 8
MDC Mode............................................................................................................................ 10
RD-LAP Mode....................................................................................................................... 11
Data Block Buffer .................................................................................................................. 12
Control Register .................................................................................................................... 12
Mode Register....................................................................................................................... 13
Command Register ............................................................................................................... 14
Transmit Mode ...................................................................................................................... 16
Receive Mode: ...................................................................................................................... 19
Task Timings......................................................................................................................... 22
Lowpass Filter Delay ............................................................................................................ 24
Status Register ..................................................................................................................... 24
Data Quality Register............................................................................................................ 26
RD-LAP
www.mxcom.com Tel: [phone] 744 5050 Fax: [phone]
TM
MDC4800 Modem
CONTENTS
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2
CMX969 Advance Information
Doc. # 20480211.002
Page