YMF754-R datasheet(37/60 Pages) YAMAHA

37 / 60 page

YMF754

June 28, 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

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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