AMBE-2000™ Vocoder Chip Users Manual
Version 4.92, June, 08
DVSI Confidential Proprietary, Subject to Change Page 5
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1.
Product Introduction 7
1.1
General Information 7
1.2
Advantages 7
1.3
Typical Applications 8
2.
AMBE-2000™ Application Design Overview 9
2.1
Basic Operation 9
2.2
Initial Design Considerations 9
2.2.1
A/D – D/A Overview 9
2.2.2
Vocoder Front End Requirements 9
2.2.3
Channel Interface Overview 11
2.2.4
Speech and FEC Rate Selection Overview 12
3
Hardware Information 13
3.1
Special Handling Instructions 13
3.1.1
Storage 13
3.2
Pin Descriptions 14
3.3
Clock and Reset Timing 16
3.4
Associated Chip Delay 18
3.5
Crystal / Oscillator Usage 18
3.5.1
TTL Clock Source 18
3.5.2
Crystal Oscillator 18
3.6
Package Description 20
3.7
Normal Operating Conditions 21
3.8
Absolute Maximum Ratings 21
3.9
Electrical Characteristics and Requirements 22
3.10
Thermal Resistance Characteristics 22
4
Channel Interface 23
4.1
Overview 23
4.2
Serial Configuration Selection 24
4.3
Channel Serial Mode 25
4.3.1
Low Level Timing for Passive and Active Serial Mode 26
5
Channel Data Format 28
5.1
Framed Format 28
5.2
Framed Input 28
5.2.1
Framed Input: Word 0 : Header 29
5.2.2
Framed Input: Word 1 : Power Control ID 29
5.2.3
Framed Input: Word 1 : Control Word 1 29
5.2.4
Framed Input: Words 2-6 : Rate Information 29
5.2.5
Framed Input: Word 7 : Unused in Input 30
5.2.6
Framed Input: Word 8 : Unused in Input 30
5.2.7
Framed Input: Word 9 : Unused in Input 30
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