AT2004
4 Channels ADPCM Processor with Echo Cancellation and Conferencing
Page 9 of 25
©2001 Atelic System, Inc
Note: The format of data fields In/Out, Conf_ind, ADPCM_ind, EC ref. Chan. #, Dec, Rate and Delay are specified below.
In/Out
Description
0
0
Input on Xin, Output o n Xout
0
1
Input on Xin, Output on Yout
1
0
Input on Yin, Output on Xout
1
1
Input on Yin, Output on Yout
Default: Input is on Xin, Output is on Xout for ADPCM encoding functions.
Input is on Yin, Output is on Yout for ADPCM decoding functions.
Conf_ind
Description
0
No resource is allocated
for conferencing operation
1
Allocate resource for
conferencing operation
Default: 0, no resource is allocated for conferencing
ADPCM_ind
Description
0
No resource is allocated
for ADPCM operation
1
Allocate resource for
ADPCM operation
Default: 1, allocate resource for ADPCM operation
“EC ref. Chan. #” specifies the channel number from which the echo canceller derives its reference signal.
Dec
Description
0
ADPCM (Input is PCM, Output is ADPCM) encode
channel
1
ADPCM (Input is ADPCM, Output is PCM) decode
channel
Command Byte [7:0]
Description
0
0
0
0
0
0
A1
A0
Chip Setup Command Header with A1, A0 chip ID
In/Out
Conf_ind
ADPCM_ind
EC ref. chan. #
Channel In/Out source, Conferencing/ADPCM indicator and EC’s
reference Channel #.
0
Dec
0
1
1
1
Rate
ADPCM, configuration command for Channel #0
Delay (ms)
Specify delay for EC, should be multiple of 2ms
Input Begin Bit
Input End Bit
Output Begin Bit
Output End Bit
These commands specify the begin and ending bits of input data and
output data for channel #0
In/Out
Conf_ind
ADPCM_ind
0
0
0
0
Channel In/Out source, Conferencing/ADPCM indicator and EC’s
reference Channel #.
0
Dec
0
1
1
1
Rate
ADPCM, configuration command for Channel #1
Delay (ms)
Specify delay for EC, should be multiple of 2ms
Input Begin Bit
Input End Bit
Output Begin Bit
Output End Bit
These commands specify the begin and ending bits of input data and
output data for channel #1
1
1
1
1
1
1
1
1
Footer of Chip Setup.
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