V.22 bis Modem with AT Commands
CMX866
CONTENTS
Section
Page
1.1
1.2
1.3
1.4
Brief Description..................................................................................1
Block Diagram .....................................................................................3
Signal List............................................................................................4
External Components..........................................................................6
1.4.1 Ring Detector Interface...........................................................8
1.4.2 Line Interface...........................................................................9
1.4.3 Serial Interface ......................................................................11
1.4.4 RESETN pin...........................................................................12
1.5
General Description...........................................................................13
1.5.1 Internal Structure ..................................................................13
1.5.2 Operating States and Data Flow...........................................14
1.5.3 Functional Description .........................................................16
1.5.4 AT Command and Register Set............................................17
1.5.4.1 AT Command and S-Register Summary..................17
1.5.4.2 General Description of AT Commands....................19
1.5.4.3 AT Commands in Detail............................................20
1.5.4.4 Extended AT Commands .........................................23
1.5.4.5 S-Registers................................................................25
1.5.4.6 Result Codes.............................................................29
1.5.5 Tx USART ..............................................................................30
1.5.6 FSK and QAM/DPSK Modulators .........................................31
1.5.7 Tx Filter and Equaliser..........................................................32
1.5.8 DTMF/Tone Generator ..........................................................32
1.5.9 Tx Level Control and Output Buffer.....................................32
1.5.10 Rx DTMF/Tones Detectors....................................................33
1.5.11 Rx Modem Filterering and Demodulation............................34
1.5.12 Rx Modem Pattern Detectors and Descrambler ..................35
1.5.13 Rx Data Register and USART ...............................................35
1.6
1.7
Application Notes..............................................................................37
1.6.1 Hardware Interface................................................................37
1.6.2 Calling Modem AT Commands.............................................42
1.6.3 Answering Modem AT Commands.......................................42
1.6.4 RS232 Transaction Sequence ..............................................43
Performance Specification................................................................44
1.7.1 Electrical Performance..........................................................44
1.7.1.1 Absolute Maximum Ratings.....................................44
1.7.1.2 Operating Limits.......................................................44
1.7.1.3 Operating Characteristics ........................................45
1.7.2 Packaging..............................................................................51
ã 2004 CML Microsystems Plc
2
D/866/4
CMLMICRO [ CML MICROCIRCUITS ]
