MX919BLH データシートの表示（PDF） - MX-COM Inc

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MX919BLH

4-Level FSK Modem Data Pump

MX-COM Inc  

4-Level FSK Modem Data Pump

Page 3 of 47

MX919B PRELIMINARY INFORMATION

4.5.2.17 T4S: Transmit 4 Symbols ............................................................................................... 20

4.5.2.18 RESET: Stop any current action .................................................................................... 20

4.5.2.19 Task Timing .................................................................................................................... 20

4.5.2.20 RRC Filter Delay............................................................................................................. 21

4.5.3 Control Register .................................................................................................................... 22

4.5.3.1 Control Register B7, B6: CKDIV - Clock Division Ratio ................................................. 22

4.5.3.2 Control Register B5, B4: FSTOL - Frame Sync Tolerance to Inexact Matches............. 22

4.5.3.3 Control Register B3, B2: LEVRES - Level Measurement Modes .................................. 23

4.5.3.4 Control Register B1, B0: PLLBW - Phase-Locked Loop Bandwidth Modes .................. 23

4.5.4 Mode Register....................................................................................................................... 24

4.5.4.1 Mode Register B7: IRQEN - IRQ Output Enable ......................................................... 24

4.5.4.2 Mode Register B6: INVSYM - Invert Symbols................................................................ 24

4.5.4.3 Mode Register B5: TX/RX - Tx/Rx Mode ...................................................................... 24

4.5.4.4 Mode Register B4: RXEYE - Show Rx Eye.................................................................... 25

4.5.4.5 Mode Register B3: PSAVE - Powersave........................................................................ 25

4.5.4.6 Mode Register B2, B1, B0 .............................................................................................. 25

4.5.5 Status Register ..................................................................................................................... 26

4.5.5.1 Status Register B7: IRQ - Interrupt Request .................................................................. 26

4.5.5.2 Status Register B6: BFREE - Data Block Buffer Free.................................................... 26

4.5.5.3 Status Register B5: IBEMPTY - Interleave Buffer Empty............................................... 26

4.5.5.4 Status Register B4: DIBOVF - De-Interleave Buffer Overflow ....................................... 26

4.5.5.5 Status Register B3: CRCERR - CRC Checksum Error.................................................. 27

4.5.5.6 Status Register B2, B1, B0............................................................................................. 27

4.5.6 Data Quality Register............................................................................................................ 27

4.6 CRC, FEC, and Interleaving............................................................................................. 27

4.6.1 Cyclic Redundancy Codes.................................................................................................... 27

4.6.1.1 CRC1 .............................................................................................................................. 27

4.6.1.2 CRC2 .............................................................................................................................. 28

4.6.1.3 Forward Error Correction................................................................................................ 28

4.6.1.4 Interleaving ..................................................................................................................... 28

4.7 Transmitted Symbol Shape.............................................................................................. 28

5. Application................................................................................................................... 30

5.1 Transmit Frame Example................................................................................................. 30

5.2 Receive Frame Example.................................................................................................. 33

5.3 Clock Extraction and Level Measurement Systems.......................................................... 36

5.3.1 Supported Types of Systems................................................................................................ 36

5.3.2 Clock and Level Acquisition Procedures with RF Carrier Detect ......................................... 36

5.3.3 Clock and Level Acquisition Procedure without RF Carrier Detect ...................................... 36

5.3.4 Automatic Acquisition Functions........................................................................................... 37

5.4 AC Coupling..................................................................................................................... 37

5.5 Radio Performance .......................................................................................................... 39

5.6 Received Signal Quality Monitor ...................................................................................... 40

©2001 MX•COM, INC.

www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480170.003

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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