AIS Baseband IC with/without RF Synthesiser
CMX7032/CMX7042
CONTENTS
Brief Description ............................................................................................................................... 2
1
1.1 History........................................................................................................................................ 5
2
3
Block Diagram ................................................................................................................................... 7
Signal List .......................................................................................................................................... 8
3.1 Signal Definitions ..................................................................................................................... 11
4
5
6
Recommended External Components .......................................................................................... 12
PCB Layout Guidelines and Power Supply Decoupling.............................................................. 15
General Description ........................................................................................................................ 17
6.1 Overview.................................................................................................................................. 17
6.2 AIS system formats ................................................................................................................. 18
7
Detailed Descriptions...................................................................................................................... 19
7.1 Clock Source ........................................................................................................................... 19
7.2 Host Interface .......................................................................................................................... 19
7.3 Function Image™ Load and Activation.................................................................................... 21
7.3.1
7.3.2
FI Loading from Host Controller................................................................................... 21
FI Loading from Serial Memory.................................................................................... 23
7.4 System Description and Tasks................................................................................................ 24
7.4.1
7.4.2
7.4.3
7.4.4
7.4.5
7.4.6
7.4.7
7.4.8
7.4.9
Signal Routing.............................................................................................................. 24
Operating Modes ......................................................................................................... 24
Modem and Data Units ................................................................................................ 24
Timing and Synchronisation......................................................................................... 25
Time of Arrival Reporting ............................................................................................. 25
Tx Timing ..................................................................................................................... 25
Rx Timing..................................................................................................................... 26
CSTDMA Threshold Measurement.............................................................................. 27
RSSI Measurement...................................................................................................... 27
7.4.10 RSSI Calibration........................................................................................................... 28
7.4.11 ADCs............................................................................................................................ 28
7.4.12 DACs............................................................................................................................ 28
7.4.13 Interrupt Operation....................................................................................................... 28
7.4.14 Deep Sleep Mode ........................................................................................................ 28
7.5 Operation of Tasks .................................................................................................................. 28
7.5.1
7.5.2
7.5.3
7.5.4
7.5.5
7.5.6
7.5.7
Tx Task Operation ....................................................................................................... 29
Rx Task Operation....................................................................................................... 30
Registers and Buffers for Tx/Rx Tasks........................................................................ 31
Write Data Registers.................................................................................................... 31
Read Data Registers.................................................................................................... 32
Data Tasks................................................................................................................... 32
Modem Tasks and Codes............................................................................................ 33
7.6 Transmission format................................................................................................................ 33
7.6.1
7.6.2
7.6.3
7.6.4
7.6.5
7.6.6
Transmit Tasks ............................................................................................................ 34
AIS Burst Mode Transmit............................................................................................. 34
Transmit Example........................................................................................................ 35
AIS Raw Mode Transmit.............................................................................................. 35
Transmitter Timing Control .......................................................................................... 35
Modulation Formats ..................................................................................................... 37
7.7 Reception................................................................................................................................. 38
7.7.1 AIS Burst Mode Receive.............................................................................................. 38
2012 CML Microsystems Plc
3
D/7032/42_FI1.2/13
CMLMICRO [ CML MICROCIRCUITS ]
