AMBE-1000 Digital Voice Systems, Inc., AMBE-1000 Datasheet - Page 36

• Manufacturer Part Number: AMBE-1000
• Manufacturer: Digital Voice Systems, Inc.

4.1.9
4.1.10
4.1.11
ID
0x00
0x01
0x02
0x03
0x04
0x06
0xFE
Header
16 bits
(5) 16 bits words of overhead (80 bits)
The AMBE-1000 is not recommended for new designs.
8 bits
ID
Please refer to the AMBE-2000/2020 product line.
Control_0 Control_1 Control_2 Control_3
8 bits
Framed Input Format
Framed Input : Header
Framed Input : ID
In Figure 4-A, we see the format of the Framed input. It is designed to be very similar
to the Framed output format, except that now instead of status information coming
out, we have control information going in. Keep in mind that even though the channel
data in this Framed input format is closely associated with the decoder, the control
information will apply to both encoder and decoder functions.
Figure 4-A Basic Framed Input Format
The decoder uses the header information to synchronize with the beginning of each 20
millisecond frame. this 16 bit word MUST be 0x13EC.
The AMBE-1000™ Vocoder Chip performs various functions based on the value of the
ID field. The ID field is the upper 8 bits of the second word in the Framed format.
Table 4-F shows the various ID’s that are allowed and a brief description of each. The
ID value controls how the information in the Control and Voice Data fields are
interpreted.
Table 4-F Framed Input : ID Values Summary
Type
Voice Data
Rate Configuration
Volume Configuration
A/D-D/A, VAD, Echo
Canceller Configuration
Low Power Mode
Dual Tone Generation
Wake up Packet
16 bits
The AMBE-1000 is not recommended for new designs.
16 bits
Please refer to the AMBE-2000/2020 product line.
16 bits
17 sixteen-bit words = 34 bytes = 272 bits
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16 bits
Description
This ID value instructs the Decoder to process only the bits in Control_0
and the Voice Data bits field. Bits in Control Words 1-3 must be set to
0x0000. See section 4.1.14.1.
The data in Control_1 and Control_2 are used to select the voice and
FEC rates.
Voice Data is processed at the newly selected rate.
4.1.14.2.
Voice data with additional control information will be sent to the vocoder.
Control information consists of input /output volume and silence
threshold. See section 4.1.14.3.
This ID value configures the serial port which connects to the A/D-D/A,
as well as selects the type of A/D-D/A being used. It also controls the
enabling/disabling of the VAD and Echo Canceller. See section 4.1.14.4.
When this mode is activated the AMBE-1000™ Vocoder Chip will go into
a mode which conserves power, where no voice packets are being
processed. See section 4.1.14.5.
Instructs the decoder to generate a DTMF Tone according to data in
Control_1-3. See section 4.1.14.6.
Used to wake up the AMBE-1000™ Vocoder Chip from Standard Sleep
Mode.
16 bits
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20 ms frame
16 bits
See section 4.1.14.7.
Control_0 is still processed.
Voice Data Bits or Additional Control Information
16 bits
(12) 16 bits words of data (192 bits)
16 bits
16 bits
Also see Section 6.6.1 for a detailed
16 bits
16 bits
Control_3 must be 0x0000.
16 bits
16 bits
See section
16 bits
16 bits