AT2004
4 Channels ADPCM Processor with Echo Cancellation and Conferencing
Page 13 of 25
©2001 Atelic System, Inc
Command Byte[7:0]
Description
0
0
1
0
0
0
A1
A0
Conferencing Header & Chip ID
Channel Configuration Begin
To begin on first channel, set to 0
Gain
Conf. Mode
Chan #1
Ch0
Chan #2
Chan #3
Conferencing command for channel 0
Gain
Conf. Mode
Chan #1
Ch1
Chan #2
Chan #3
Conferencing command for channel 1
Gain
Conf. Mode
Chan #1
Ch2
Chan #2
Chan #3
Conferencing command for channel 2
Gain
Conf. Mode
Chan #1
Ch3
Chan #2
Chan #3
Conferencing command for channel 3
Note: Chan #1, Chan #2 and Chan #3 are channel number of conferencing resource with current channel. The format of data fields gain
and conf. mode are specified below.
The Gain of the channel is set according to the following table:
Gain[1:0]
Description
0
0
Gain = 0dB
0
1
Gain = +6dB
1
0
Gain = -12dB
1
1
Gain = -6dB
Default: gain is set to 0dB.
The Conf. mode of the channel is set according to the following table:
Conf. mode[1:0]
Description
0
0
Disable conferencing
0
1
One channel (specified by Chan #1) is used for conferencing
1
0
Two channels (specified by Chan #1, Chan #2 ) is used for conferencing
1
1
Three channels (specified by Chan #1, Chan #2, Chan #3) is used for
conferencing
Chip Power-up Power-down command
The chip power-up / power-down command is a single command byte which enables and disables the AT2004 chip.
Power-up chip mode will:
1.
Stop the sample processing
2.
Power-up the PLL to the specified multiplier frequency
3.
Reset algorithms on the chip.
Power-down chip mode will:
1.
Stop the sample processing.
2.
Switch the system clock to the power down clock running approximately at 125 Hz.
0
0
0
1
0
0
A1
A0
Power-up Chip Command
0
0
0
0
1
0
A1
A0
Power-down Chip Command
Note:
A1, A0 refers to the chip ID.
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