AT2008 Datasheet, PDF (8/19 Pages) List of Unclassifed Manufacturers – 8 Channels ADPCM Processor

AT2008
8 Channels ADPCM Processor
Command Byte [7:0]
Descrip tion
00 0
0
0 0 A1 A0 Chip Setup Command Header with A1, A0 chip ID
In/Out 0 ADPCM_ind 0 0 0 0 Specify channel In/Out source and ADPCM indicator.
0 Dec 0
1
1 1 Rate ADPCM, configuration command for Channel #0
00 0
0
0 0 0 0 System reserved
Input Begin Bit
Input End Bit
These commands specify the begin and ending bits of input data and output
data for channel #0
Output Begin Bit
Output End Bit
In/Out 0 ADPCM_ind 0 0 0 0 Specify channel In/Out source and ADPCM indicator
0 Dec 0
1
1 1 Rate ADPCM, configuration command for Channel #1
00 0
0
0 0 0 0 System reserved
Input Begin Bit
These commands specify the begin and ending bits of input data and output
Input End Bit
data for channel #1
Output Begin Bit
Output End Bit
11 1
1
1 1 1 1 Footer of Chip Setup.
Note: The format of data fields In/Out, ADPCM_ind, Dec and Rate are specified below.
In/Out Description
0 0 Input on Xin, Output on 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.
ADPCM_ind Description
0
No resource is allocated
for ADPCM operation
1
Allocate resource for
ADPCM operation
Default: 1, allocate resource for ADPCM operation
Dec Description
0 ADPCM (Input is PCM, Output is ADPCM) encode
channel
1 ADPCM (Input is ADPCM, Output is PCM) decode
channel
Default: 1 for channel 0, 1, 2, 3;
0 for channel 4, 5, 6, 7.
Rate Description
0 0 16k ADPCM bitrate
0 1 24k ADPCM bitrate
1 0 32k ADPCM bitrate
1 1 40k ADPCM bitrate
Default: 10 for 32k ADPCM bit-rate
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©2001 Atelic Systems, Inc.