
4-Level FSK Modem Data Pump
FX919A
1996 Consumer Microcircuits Limited
2
D/919A/4
CONTENTS
Section
Page
1.0 Features..........................................................................................................1
1.1 Brief Description............................................................................................1
1.2 Block Diagram................................................................................................3
1.3 Signal List.......................................................................................................4
1.4 External Components....................................................................................6
1.5 General Description.......................................................................................7
1.5.1 Description of Blocks.......................................................................7
1.5.2 Modem - μC Interaction.................................................................10
1.5.3 Binary to Symbol Translation.........................................................11
1.5.4 Frame Structure ............................................................................12
1.5.5 The Programmer's View................................................................13
1.5.5.1 Data Block Buffer .......................................................................13
1.5.5.2 Command Register ....................................................................14
1.5.5.3 Control Register .........................................................................22
1.5.5.4 Mode Register............................................................................24
1.5.5.5 Status Register...........................................................................25
1.5.5.6 Data Quality Register.................................................................27
1.5.6 CRC, FEC, and Interleaving..........................................................28
1.6 Application Notes........................................................................................29
1.6.1 Transmit Frame Examples ............................................................29
1.6.2 Receive Frame Examples .............................................................32
1.6.3 Clock Extraction & Level Measurement Systems..........................35
1.6.4 AC Coupling ..................................................................................36
1.6.5 Radio Performance........................................................................38
1.7 Performance Specification .........................................................................39
1.7.1 Electrical Performance ..................................................................39
1.7.2 Packaging......................................................................................43
Note:
As this product is still in development, it is likely that a number of changes and additions will be
made to this specification. Items marked TBD or left blank will be included in later issues.