CS4239 datasheet(45/98 Pages) CIRRUS

45 / 98 page

WSS EXTENDED REGISTERS

The Windows Sound System codec contains

three sets of registers: R0-R3, I0-I31, and X0-

X31. R0-R3 are directly mapped to the ISA bus

through WSSbase+0 through WSSbase+3 re-

spectively. R0 and R1 provide access to the

indirect registers I0-I31. The third set of registers

are extended registers X0-X31 that are indirectly

mapped through the WSS register I23. I23 acts

as both the extended address and extended data

able when in MODE 3.

Accessing the X registers requires writing the

XRAE is set, I23 changes from an address regis-

ter to a data register. Subsequent accesses to I23

access the extended data register. To convert I23

back to the extended address register, R0 must

be written which internally clears XRAE. As-

suming the part is in MODE 3, the following

steps access the X registers:

1. Write 17h to R0 (to access I23).

R1 is now the extended address register.

2. Write the desired X register address to R1

with XRAE = 1.

R1 is now the extended data register.

3. Write/Read X register data from R1.

To read/write a different X register:

4. Write 17h to R0 again. (resets XRAE)

R1 is now the extended address register.

5. Write the new X register address to R1

with XRAE = 1.

R1 is now the new extended data register.

6. Read/Write new X register data from R1.

Address

Reg.

WSSbase+0

Reset Address

WSSbase+1

Address/Data access

I23

Indexed Address/Data

Extended Register Access (I23)

XA3

XA2

XA1

XA0

XRAE

XA4

res

rbc

Table 11. WSS Extended Register Control

Index

Reserved, backwards compatible

MIC Volume

MIC Volume (same as X2)

Synthesis and Input Mixer Control

Right Input Mixer Control

Left FM Synthesis Mute

Right FM Synthesis Mute

Left DSP Serial Port Mute

Right DSP Serial Port Mute

X10

Reserved, backwards compatible

X11

DAC1 Mute and IFSE Enable

X12

Independent ADC Sample Freq.

X13

Independent DAC Sample Freq.

X14

Reserved, backwards compatible

X15

Reserved, backwards compatible

X16

Left Wavetable Serial Port Mute

X17

Right Wavetable Serial Port Mute

X18

3D Enable & RAM Port Enable

X19

FM Volume Scaling

X20

Reserved

X21

Reserved

X22

Reserved

X23

(C2) 3D Space Control

X24

(C8) Wavetable & Volume Control

X25

Chip Version and ID

X26

(Cb+0) Joystick Control

X27

(Cb+1) E

2PROM Interface

X28

(Cb+2) Power Down Control 1

X29

(C9) Power Down Control 2

X30

(Cb+7) Global Status

X31

Reserved

Table 12. WSS Extended Registers

DS253PP2

CS4239

CrystalClear Portable ISA Audio System

CS4239 Datasheet(PDF) 45 Page - Cirrus Logic

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