AMBE2000 datasheet(25/47 Pages) ETC

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AMBE-2000™ Vocoder Chip

User’s Manual Version 3.0

page 25

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Figure 5-A Basic Formatted Input Format

Word #

Description

Header always set to 0x13EC

Power Control (8bits)

Control Word 1 (8 bits) – see Table 5-B

Rate info 0

Rate info 1

Rate info 2

Rate info 3

Rate info 4

See Tables 5-C and 5-D

Unused in Input

DTMF Control – see Tables 5-E and 5-F

Control Word 2 – see Table 5-G

Channel Data

5.2.1 Formatted Input : Word 0 : Header

The decoder uses the header information to synchronize with the beginning of each 20 millisecond frame. this 16 bit word

MUST be 0x13EC.

5.2.2 Formatted Input : Word 1 : Power Control

Set the encoder to 0x00 in the 8-bit Power Control field of an output frame for normal use. For Power Down Mode, set this

value to 0x55. This causes the AMBE-2000 to enter low power mode. To exit low power mode, the device must be reset

through the hardware.

Table 5-A Formatted Input : ID Values Summary

Type

Description

0x00

Voice Data

This ID value instructs AMBE-2000™ to operate in normal fashion

0x55

Low Power Mode

When this mode is activated the AMBE-2000™ Vocoder Chip will go into

a mode which conserves power, where no voice packets are being

processed.

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