Table of Contents
Advertisement
YMF744B
2-2-2. Sound Blaster Pro Mixer
The following shows the register map of the Mixer section of Sound Blaster Pro.
Address
b7
00h
04h
Voice Volume L
0Ah
-
0Ch
-
0Eh
-
22h
Master Volume L
26h
MIDI Volume L
28h
CD Volume L*
2Eh
Line Volume L*
F0h
SBPDA
F1h
F8h
-
The registers marked with * exist, but do not function.
DS-1S does not have the circuit that corresponds to the SB Mixer. Therefore, the volume settings on the
SB Mixer are converted to the DSP coefficients of DS-1S or to AC'97 register values.
The conversion for each case is described below.
(1) SB Mixer ® DSP
The volume of master, MIDI and Voice, are applied to this case.
When the SB register is set, a 14-bit coefficient value is determined from the following conversion table
and used as the DSP coefficient. The attenuation value of Master Volume, MIDI, and voice are summed
together to obtain the coefficient.
These volumes cannot be controlled from PCI Audio block.
b6
b5
b4
Reset
"1"
-
-
"1"
Ifilter*
-
"1"
-
Ofilter*
"1"
"1"
"1"
"1"
"1"
-
-
-
SCAN DATA
-
-
-
b3
b2
b1
Voice Volume R
-
MIC Volume*
Input Source*
-
-
St. SW
Master Volume R
MIDI Volume R
CD Volume R*
Line Volume R*
SS
SM
SE
SBPDR
-
-
-
-38-
b0
Remark
"1"
"1"
"1"
SB Pro Mixer
"1"
"1"
"1"
"1"
Suspend / Resume
SBI
IRQ Status
February 3, 1999
Advertisement
Table of Contents
