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-2020™ 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
10
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
17
3.5
Crystal / Oscillator Usage
18
3.5.1
TTL Clock Source
18
3.5.2
Crystal Oscillator
18
3.6
Package Description
19
3.7
Normal Operating Conditions
21
3.8
Absolute Maximum Ratings
21
3.9
Electrical Characteristics and Requirements
21
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 Format
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
30
5.2.4
Framed Input: Words 2-6 : Rate Information
30
5.2.5
Framed Input: Word 7 : Unused in Input
31
