CS4239 datasheet(52/98 Pages) CIRRUS

52 / 98 page

VCF1

Hardware Volume Control Format.

This bit controls the format of the

UP, DOWN, and MUTE pins. VCF1

is initialized in the E

2PROM Hard-

ware Configuration data, Global

Configuration byte.

0 - MUTE is a momentary button.

Pressing MUTE toggles between

mute and un-mute. Pressing UP or

DOWN will always un-mute.

1 - MUTE is not used. Pressing the

up and down buttons simultane-

ously causes the volume to mute.

Pressing up or down singularly will

un-mute.

VCIE

Volume Control Interrupt Enable.

When set, the hardware volume

control pins cause interrupts, when

pressed, on the WSSint pin. The

status is available in CTRLbase+7,

IMV bit. The IMV bit is cleared by

reading CTRLbase+7.

Chip Version and ID (X25)

Default = 11011110

CID4

CID3

CID2

CID1

CID0

CID5-CID0

Chip Identification. Distinguishes

between this chip and other codec

chips that support this register set.

This register is identical to C1 and

replaces the ID register in I25.

11110 - CS4239

V2-V0

Version Number. As enhancements

are made, the version number is

changed so software can distinguish

between the different versions of the

same chip.

100 - Revision A

101 - Revision B

110 - Revision C

Joystick Control (X26)

Default = xx0x0x01

rbc

CONSW

rbc

ZERO

rbc

JR1

JR0

X26 and CTRLbase+0 access the same data with the

exception that the XTAL bit in CTRLbase is replaced

with ZERO in this register.

JR1,0

Joystick rate control. Selects operating

speed of the joystick (changes the

trigger threshold for the X/Y coordi-

nates).

00 - slowest speed

01 - medium slow speed

10 - medium fast speed

11 - fastest speed

ZERO

This bit MUST be written to 0. Writing

this bit to 1 will disable all accesses

to the WSS register space.

CONSW

controls host interrupt generation

when a context switch occurs

0 - no interrupt on context switch

1 - Control interrupt generated on

context switch

2PROM Interface (X27)

CTRLbase+1, Default = 1xxxx000

ICH

rbc

DIN/

EEN

DOUT

CLK

X27 and CTRLbase+1 access the same data.

CLK

This bit is used to generate the clock

for the Plug and Play E

2PROM.

EEN must be set to 1 to make this

bit operational. A 1 sets the SCL pin

high and a 0 sets the SCL pin low.

DOUT

This bit is used to output serial data

to the Plug and Play E

2PROM. EEN

must be set to 1 to make this bit op-

erational. A 0 causes SDA to go low.

A 1 releases SDA (open-drain).

DS253PP2

CS4239

CrystalClear Portable ISA Audio System

CS4239 Datasheet(PDF) 52 Page - Cirrus Logic

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