CMX644A データシートの表示（PDF） - MX-COM Inc

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CMX644A

Bell 212A and V.22 Modem with Call Progress and DTMF

MX-COM Inc  

Bell 212A / V.22 Modem with Call Progress and DTMF

2

Section

CONTENTS

CMX644A Preliminary Information

Page

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

2 Signal List ...................................................................................................................... 4

3 External Components.................................................................................................... 6

4 General Description....................................................................................................... 7

4.1 ‘C-BUS’ Serial Interface .......................................................................................................7

4.2 UART....................................................................................................................................8

4.3 Software Description ............................................................................................................9

4.3.1 Write-only ‘C-BUS’ Registers ................................................................................................. 9

4.3.2 Write-only Register Descriptions............................................................................................ 9

4.3.3 Read Only ‘C-BUS’ Registers .............................................................................................. 16

5 Application Notes ........................................................................................................ 20

5.1 Line Interface......................................................................................................................20

5.1.1 4-Wire Line Interface............................................................................................................ 20

5.1.2 2-Wire Line Interface............................................................................................................ 21

5.2 Ring Detector Interface ......................................................................................................22

5.3 Software Protocol for Transmitting PSK Data Bytes ..........................................................23

5.4 Software Protocol for Receiving PSK Data Bytes ..............................................................23

5.5 Handling Underflow and Overflow Conditions....................................................................24

6 Performance Specification ......................................................................................... 26

6.1 Electrical Performance .......................................................................................................26

6.1.1 Absolute Maximum Ratings ................................................................................................. 26

6.1.2 Operating Limits ................................................................................................................... 26

6.1.3 Operating Characteristics .................................................................................................... 27

6.1.4 Timing .................................................................................................................................. 29

6.2 Packaging...........................................................................................................................31

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

2000 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

Doc. # 20480197.006

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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