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
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
6.1
Address/Commands ............................................................................................................ 7
Address Select .................................................................................................................... 8
Write to Control Register ..................................................................................................... 9
RX Data buffer -- “Read RX Data Buffer” ............................................................................ 9
TX Data Buffer -- “Write to TX Data Buffer” ....................................................................... 10
SYNC Program -- “Write to SYNC Program” ..................................................................... 10
Read Status Register ........................................................................................................ 10
Interrupt Request............................................................................................................... 11
General Reset ................................................................................................................... 11
Checksum Generation and Checking................................................................................ 12
6.1.1
6.1.2
Generation .............................................................................................................................. 12
Checking ................................................................................................................................. 12
6 Application ................................................................................................................... 12
6.2
6.3
6.4
Modem Performance ......................................................................................................... 12
Modem Timing Information................................................................................................ 13
TX Timing .......................................................................................................................... 14
6.4.1
6.4.2
6.4.3
6.4.4
TX More Than One Message, SYNC Before Every Message, TX Checksum Enabled ......... 14
TX More Than One Message, TX Checksum Not Enabled. ................................................... 14
TX One Message, TX Checksum Enabled ............................................................................. 15
TX One Message, TX Checksum Not Enabled....................................................................... 15
RX
SYNC
/
SYNC
Required Before Every Message, Rx Checksum Not Enabled ................. 16
RX Additional Data Follows Initial Address (6 Data & 2 Checksum Bytes) Data, RX checksum
Enabled................................................................................................................................... 16
6.5
RX Timing.......................................................................................................................... 16
6.5.1
6.5.2
7 Performance Specifications........................................................................................ 17
7.1
Electrical Specifications..................................................................................................... 17
7.1.1
7.1.2
7.1.3
7.1.4
Absolute Maximum Limits ....................................................................................................... 17
Operating Limits...................................................................................................................... 17
Operating Characteristics ....................................................................................................... 18
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 ]
