参数资料
型号: YMF754-V
元件分类: 微控制器/微处理器
英文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PQFP128
封装: 0.50 MM PITCH, LQFP-128
文件页数: 31/60页
文件大小: 309K
代理商: YMF754-V
YMF754
December 25, 1999
-37-
2-2-2. Sound Blaster Pro Mixer
The following shows the register map of the Mixer section of Sound Blaster Pro.
Address
b7b6
b5b4b3
b2b1b0
Remark
00h
Reset
04h
Voice Volume L
"1"
Voice Volume R
"1"
0Ah
-
"1"
-
MIC Volume*
0Ch
-
Ifilter*
"1"
Input Source*
"1"
0Eh
-
Ofilter*
"1"
-
St. SW
"1"
22h
Master Volume L
"1"
Master Volume R
"1"
26h
MIDI Volume L
"1"
MIDI Volume R
"1"
28h
CD Volume L*
"1"
CD Volume R*
"1"
2Eh
Line Volume L*
"1"
Line Volume R*
"1"
SB Pro Mixer
F0h
SBPDA
-
SS
SM
SE
SBPDR
F1h
SCAN
DATA
F2h
Current FM Synthesizer Index
F3h
-
CFA
F4h
FFEMP
FFFUL
-
MPUS
Suspend / Resume
F8h
-
SBI
IRQ Status
The registers marked with * exist, but do not function.
DS-1E 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-1E 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.
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