MX929BDW Просмотр технического описания (PDF) - MX-COM Inc
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MX929BDW Datasheet PDF : 51 Pages
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4-Level FSK Modem Data Pump
Page 2 of 50
MX929B PRELIMINARY INFORMATION
CONTENTS
Section
Page
1. Block Diagram ............................................................................................................... 6
2. Signal List ...................................................................................................................... 7
3. External Components ................................................................................................... 8
4. General Description .................................................................................................... 10
4.1 Description of Blocks ....................................................................................................... 10
4.1.1 Data Bus Buffers................................................................................................................... 10
4.1.2 Address and R/W Decode .................................................................................................... 10
4.1.3 Status and Data Quality Registers ........................................................................................ 10
4.1.4 Command, Mode, and Control Registers ............................................................................. 10
4.1.5 Data Buffer............................................................................................................................ 10
4.1.6 CRC Generator/Checker ...................................................................................................... 10
4.1.7 FEC Generator/Checker ....................................................................................................... 10
4.1.8 Interleave/De-Interleave Buffer ............................................................................................. 10
4.1.9 Frame Sync Detect ............................................................................................................... 10
4.1.10 Rx Input Amp ........................................................................................................................ 11
4.1.11 RRC Low Pass Filter............................................................................................................. 11
4.1.12 Tx Output Buffer ................................................................................................................... 12
4.1.13 Rx Level/Clock Extraction ..................................................................................................... 13
4.1.14 Clock Oscillator and Dividers ................................................................................................ 13
4.2 Modem - µC Interaction ................................................................................................... 13
4.3 Binary to Symbol Translation ........................................................................................... 14
4.4 Frame Structure............................................................................................................... 15
4.5 The Programmer's View .................................................................................................. 16
4.5.1 Data Block Buffer .................................................................................................................. 16
4.5.2 Command Register ............................................................................................................... 17
4.5.2.1 Command Register B7: AQSC - Acquire Symbol Clock ............................................ 17
4.5.2.2 Command Register B6: AQLEV - Acquire Receive Signal Levels ............................. 17
4.5.2.3 Command Register B5: CRC .................................................................................... 17
4.5.2.4 Command Register B4: TXIMP - Tx Level/Impulse Shape ........................................ 17
4.5.2.5 Command Register B3 - Reserved ............................................................................ 17
4.5.2.6 Command Register B2, B1, B0: TASK....................................................................... 18
4.5.2.7 NULL: No effect .......................................................................................................... 19
4.5.2.8 SFP: Search for Frame Preamble .............................................................................. 19
4.5.2.9 RHB: Read Header Block........................................................................................... 20
4.5.2.10 RILB: Read 'Intermediate' or 'Last' Block ................................................................... 20
4.5.2.11 SFS: Search for Frame Sync...................................................................................... 20
4.5.2.12 R4S: Read 4 Symbols ................................................................................................ 20
4.5.2.13 RSID: Read Station ID................................................................................................ 20
4.5.2.14 T24S: Transmit 24 Symbols ....................................................................................... 21
4.5.2.15 THB: Transmit Header Block...................................................................................... 21
©2001 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480171.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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