MSK Modem
2
MX809
Contents
Section
Page
1 Block Diagram................................................................................................................3
2 Signal List.......................................................................................................................4
3 External Components....................................................................................................6
4 General Description.......................................................................................................7
5 Controlling Protocol ......................................................................................................7
5.1 Address/Commands............................................................................................................ 7
5.2 Address Select .................................................................................................................... 8
5.3 Write to Control Register ..................................................................................................... 9
5.4 RX Data buffer -- “Read RX Data Buffer” ............................................................................ 9
5.5 TX Data Buffer -- “Write to TX Data Buffer”....................................................................... 10
5.6 SYNC Program -- “Write to SYNC Program”..................................................................... 10
5.7 Read Status Register ........................................................................................................ 10
5.8 Interrupt Request............................................................................................................... 11
5.9 General Reset ................................................................................................................... 11
6 Application ................................................................................................................... 12
6.1 Checksum Generation and Checking................................................................................ 12
6.1.1 Generation ..............................................................................................................................12
6.1.2 Checking.................................................................................................................................12
6.2 Modem Performance......................................................................................................... 12
6.3 Modem Timing Information................................................................................................ 13
6.4 TX Timing .......................................................................................................................... 14
6.4.1 TX More Than One Message, SYNC Before Every Message, TX Checksum Enabled .........14
6.4.2 TX More Than One Message, TX Checksum Not Enabled. ...................................................14
6.4.3 TX One Message, TX Checksum Enabled .............................................................................15
6.4.4 TX One Message, TX Checksum Not Enabled.......................................................................15
6.5 RX Timing.......................................................................................................................... 16
6.5.1 RX SYNC / SYNC Required Before Every Message, Rx Checksum Not Enabled .................16
6.5.2 RX Additional Data Follows Initial Address (6 Data & 2 Checksum Bytes) Data, RX checksum
Enabled...................................................................................................................................16
7 Performance Specifications........................................................................................17
7.1 Electrical Specifications..................................................................................................... 17
7.1.1 Absolute Maximum Limits.......................................................................................................17
7.1.2 Operating Limits......................................................................................................................17
7.1.3 Operating Characteristics .......................................................................................................18
7.1.4 Timing .....................................................................................................................................20
7.2 Packages........................................................................................................................... 21
MXCOM, Inc. reserves the right to change specifications at any time without notice.
ꢀ1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480036.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
CMLMICRO [ CML MICROCIRCUITS ]
