EMP202 Datasheet, PDF (10/28 Pages) List of Unclassifed Manufacturers – Single-Chip Dual-Channel AC’97 Audio Codec for PC Audio Systems

Single-Chip Dual-Channel AC’97 Audio Codec
EMP202
EMPIA Technology
5.1.6. MX0C PHONE Volume
Default: 8008H
Register 0Ch controls the telephone input volume for software modem applications. Because
software modem applications may not have a speaker, the CODEC can offer a speaker-out service.
Each step in bits 4:0 corresponds to 1.5dB in increase/decrease in volume, allowing 32 levels of
volume, from 00000 to 11111.
Bit
15
14:5
4:0
1) For PV:
Type
R/W
-
R/W
00h
08h
1Fh
Function
Mute Control:
0: Normal
1: Mute (- ‡dB)
Reserved
Phone Volume: (PV[4:0]) in 1.5 dB steps
+12 dB Gain
0dB gain
-34.5dB Gain
5.1.7.MX0E MIC Volume
Default: 8008H
Register 0Eh controls the microphone input volume. Each step in bits 4:0 corresponds to 1.5dB in
increase/decrease in volume, allowing 32 levels of volume, from 00000 to 11111. Each step in bit 6
corresponds to a magnification of 20dB increase in volume.
Bit
15
Type
R/W
14:7
-
6
R/W
5
4:0
1) For MV:
-
R/W
00h
08h
1Fh
Function
Mute Control:
0: Normal
1: Mute (- ‡dB)
Reserved
Mic Boost
0 0dB
1 20dB
Reserved
Mic Volume: (MV[4:0]) in 1.5 dB steps
+12 dB Gain
0dB gain
-34.5dB Gain
5.1.8.MX10 LINE_IN Volume
Default: 8808H
Each step in bits 0..4 correspond to 1.5dB in increase/decrease in volume for the right channel,
allowing 32 levels of volume, from 00000 to 11111. Each step in bits 12:8 correspond to 1.5dB in
increase/decrease in volume for the left channel, allowing 32 levels of volume, from 00000 to 11111.
Bit
15
Type
R/W
14:13
-
12:8
R/W
7:5
-
4:0
R/W
1) For NL/NR: 00h
08h
1Fh
Function
Mute Control:
0: Normal
1: Mute (- ‡dB)
Reserved
Line-In Left Volume: (NL[4:0]) in 1.5 dB steps
Reserved
Line-In Right Volume: (NR[4:0]) in 1.5 dB steps
+12 dB Gain
0dB gain
-34.5dB Gain
7/15/2002
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