MX429A データシートの表示（PDF） - MX-COM Inc

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MX429A

1200/2400bps MSK Modem for Trunked Radio Systems

MX-COM Inc  

1200/2400bps MSK Modem for Trunked Radio Systems

2

Section

CONTENTS

MX429A

Page

1 Block Diagram................................................................................................................. 3

2 Signal List........................................................................................................................ 3

3 External Components..................................................................................................... 5

4 General Description........................................................................................................ 6

4.1 Modems in Mobile Data Signaling .......................................................................................... 6

4.1.1 Digital Code Format.................................................................................................................... 6

4.1.2 Operation.................................................................................................................................... 6

4.1.3 Non MPT Application – Full-Duplex.......................................................................................... 7

4.1.4 Control Register (A1 = 1, A0 = 1, R/ W = 0, Write Only)........................................................... 7

4.1.5 Status Register (A1 = 1, A0 = 1, R/ W = 1, Read Only) ............................................................ 8

4.1.6 Rx Data Buffer (A1 = 1, A0 = 0, R/ W = 1, Read Only) ............................................................. 9

4.1.7 Tx Data Buffer (A1 = 1, A0 = 0, R/ W = 0, Write Only).............................................................. 9

4.2 Syndrome Word.................................................................................................................... 10

4.2.1 Syndrome Low Byte (A1 = 0, A0 = 0, R/ W = 1, Read Only) .................................................. 10

4.2.2 Syndrome High Byte (A1 = 0, A0 = 1, R/ W = 1, Read Only).................................................. 10

4.3 Carrier Detect Time Constant............................................................................................... 10

5 Application .................................................................................................................... 11

5.1 Checksum Generation and Checking................................................................................... 11

5.2 Receive Operation................................................................................................................ 11

5.3 Transmit Operation............................................................................................................... 12

5.4 Basic Power Up Software..................................................................................................... 13

5.5 Basic Software Interrupt Flow............................................................................................... 14

5.6 Bus Interface Timing............................................................................................................. 15

5.6.1 Bus interface design migration from MX429 to MX429A .......................................................... 15

6 Performance Specification........................................................................................... 15

6.1 Electrical Performance ......................................................................................................... 15

6.1.1 Absolute Maximum Ratings ...................................................................................................... 15

6.1.2 Operating Limits ....................................................................................................................... 15

6.1.3 Operating Characteristics ......................................................................................................... 16

6.1.4 Timing....................................................................................................................................... 18

6.2 Packaging............................................................................................................................. 18

MX•COM, Inc. reserves the right to change specifications at any time and without notice.

© 1998 MX-COM Inc.

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

Doc. # 20480128.007

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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