CMX608 datasheet(3/70 Pages) CMLMICRO

3 / 70 page

RALCWI Vocoder

CMX608/CMX618/CMX638

 2014 CML Microsystems Plc

D/608_18_38/11

CONTENTS

Section

Page

Brief Description ..................................................................................................................... 1

Block Diagram ......................................................................................................................... 5

Signal List ................................................................................................................................ 6

External Components............................................................................................................. 9

4.1.

PCB Layout Guidelines and Power Supply Decoupling ................................................. 11

4.2.

Audio CODEC External Components (CMX618/CMX638 only) .................................... 12

General Description .............................................................................................................. 13

5.1.

Initialisation .................................................................................................................... 14

5.2.

Encoder.......................................................................................................................... 15

5.2.1.

Single Frame Packet, without FEC, STD or DTMF.............................................. 15

5.2.2.

Multiple Frame Packet with FEC, but without STD or DTMF ............................... 16

5.3.

Decoder ......................................................................................................................... 16

5.3.1.

Single Frame Packet, without FEC, STD or DTMF.............................................. 17

5.3.2.

Multiple Frame Packet with FEC, but without STD or DTMF ............................... 19

5.4.

Overall Signal Latency ................................................................................................... 20

5.5.

Vocoder Data Format and Bit Order .............................................................................. 20

5.5.1.

Packets of Raw Vocoder Frames ........................................................................ 20

5.5.2.

Packets of FEC Protected Frames ...................................................................... 22

5.6.

External CODEC Support .............................................................................................. 23

5.7.

Operation with DTMF (Dual Tone Multi-Frequency) ...................................................... 26

5.7.1.

DTMF Transmit .................................................................................................... 26

5.7.2.

DTMF Receive ..................................................................................................... 26

5.7.3.

DTMF Format....................................................................................................... 27

5.8.

Operation with STD (Single Tones) ............................................................................... 28

5.9.

C-BUS Interface............................................................................................................. 29

5.10. C-BUS Registers............................................................................................................ 32

5.10.1. Command Registers ............................................................................................ 32

5.10.2. 8 Bit Write-Only Registers .................................................................................... 33

5.10.3. 8 Bit Read-Only Registers .................................................................................... 44

5.10.4. 16-bit Write-Only Registers .................................................................................. 46

5.10.5. 16-bit Read-Only Registers .................................................................................. 51

Application Notes.................................................................................................................. 55

6.1.

Basic Operation of the Vocoder ..................................................................................... 55

6.2.

FEC and LLR Decoding ................................................................................................. 57

6.3.

DTX and SID Functions ................................................................................................. 57

6.4.

Single Tone Transfer ..................................................................................................... 57

6.5.

Slip Management ........................................................................................................... 57

6.6.

Setting the Watermarks for the Vocoder Data Input (Output) FIFOs ............................ 59

6.7.

Download Protocol for Function Images

™ .................................................................... 59

6.8.

Using the PLEVEL register to set the Input Gain........................................................... 60

Performance Specification................................................................................................... 61

7.1.

Electrical Performance................................................................................................... 61

7.1.1.

Absolute Maximum Ratings ................................................................................. 61

7.1.2.

Operating Limits ................................................................................................... 61

7.1.3.

Operating Characteristics..................................................................................... 62

7.2.

Packaging ...................................................................................................................... 68

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