VT8231 datasheet(60/132 Pages) ETC

60 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-54-

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SoundBlaster Pro Port Registers

These registers are located at offsets from “SBPBase” (defined

in Rx43 of Audio Function 5 PCI configuration space).

SBPBase is typically set to allow these ports to be accessed at

the standard SoundBlaster Pro port address of 220h or 240h.

FM Registers

Port SBPBase+0 – FM Left Channel Index / Status.......RW

7-0

FM Right Channel Index / Status

Port SBPBase+1 – FM Left Channel Data..................... WO

7-0

Right Channel FM Data

Port SBPBase+2 – FM Right Channel Index / Status ....RW

7-0

FM Right Channel Index / Status

Port SBPBase+3 – FM Right Channel Data .................. WO

7-0

Right Channel FM Data

Port 388h or SBPBase+8 – FM Index / Status ................RW

7-0

FM Index / Status (Both Channels)

Writing to this port programs both the left and right channels

(the write programms port offsets 0 and 2 as well)

Port 389h or SBPBase+9 – FM Data .............................. WO

7-0

FM Data (Both Channels)

Writing to this port programs both the left and right channels

(the write programms port offsets 1 and 3 as well)

Mixer Registers

Port SBPBase+4 – Mixer Index....................................... WO

7-0

Mixer Index

Port SBPBase+5 – Mixer Data .........................................RW

7-0

Mixer Data

Sound Processor Registers

Port SBPBase+6 – Sound Processor Reset ..................... WO

1 = Sound Processor Reset

Port SBPBase+A – Sound Processor Read Data .............RO

7-0

Sound Processor Read Data

Port SBPBase+C – Sound Processor Command / Data WO

7-0

Sound Processor Command / Write Data

Port SBPBase+C – Sound Processor Buffer Status.........RO

1 = Sound Processor Command / Data Port Busy

Port SBPBase+E – Sound Processor Data Avail Status..RO

1 = Sound Processor Data Available

Index Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0

Test

Fast Counter (80 usec)

Slow Counter (320 usec)

IRQ

MFC MSC

SSSC SSFC

CSM

SEL

20-35

VIB

EGT

KSR

Multi

40-55

KSL

Total Level (TL)

60-75

Attack Rate (AR)

Decay Rate (DR)

80-95

Sustain Level (SL)

Release Rate (RR)

A0-A8

F-Number

B0-B8

Key

Block

F-Number

Int AM VIB

Ryth

Bass Snare Tom

Cym HiHat

C0-C8

Feedback

E0-F5

MFC=Mask Fast Counter

SSFC=Start / Stop Fast Counter

MSC=Mask Slow Counter

SSSC=Start / Stop Slow Counter

Index Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0

Data Reset

SP Volume L

SP Volume R

Mic Vol

Finp

TFIL

Select

Fout

General Volume

FM Volume L

FM Volume R

CD Volume L

CD Volume R

Line Volume L

Line Volume R

Finp = Input Filter

Fout = Output Filter

TFIL = Input Filter Type

ST = Stereo / Mono Mode

Select = Input Choices (0=Microphone, 1=CD, 3=Line)

Command Summary – Sound Processor (see next page)

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