CS4239 datasheet(49/98 Pages) CIRRUS

49 / 98 page

MIMR

Mono Input Mute to the Right Output

mixer. When set to 1, the MIN signal

to the right output mixer is muted.

The default state of this bit is set by

MIM in the Hardware Configuration

Data, Mono & DSP Port byte.

Right Input Mixer Control (X5)

Default = x00xxxxx

rbc

RIS1

RIS0

res

RIS1-RIS0

Right Input Mixer Summer Attenuator.

This attenuates the inputs to the

right input mixer to enable overload

protection when multiple input

sources are utilized.

00 - 0 dB

01 - -6 dB

10 - -12 dB

11 - -18 dB

Left FM Synthesis Mute (X6)

Default = exxxxxxx

LFMM

res

rbc

LFMM

Left FM mute. When set to 1, the

left internal FM input to DAC2 is

muted. The default state of this bit is

the inverse of IFM in the Hardware

Configuration Data, Global Configura-

tion byte.

Right FM Synthesis Mute (X7)

Default = exxxxxxx

RFMM

res

rbc

RFMM

Right FM mute. When set to 1, the

right internal FM input to DAC2 is

muted. The default state of this bit is

the inverse of IFM in the Hardware

Configuration Data, Global Configura-

tion byte.

Left DSP Serial Port Mute (X8)

Default = exxxxxxx

LSPM

res

rbc

LSPM

Left DSP Serial Port Mute. When set

to 1, the Left DSP Serial Port input

(SDIN) is muted. The default state of

this bit is the inverse of SPE in the

Hardware Configuration Data, Mono

& DSP Port byte.

Right DSP Serial Port Mute (X9)

Default = exxxxxxx

RSPM

res

rbc

RSPM

Right DSP Serial Port Mute. When

set to 1, the Right DSP Serial Port

input (SDIN) is muted. The default

state of this bit is the inverse of SPE

in the Hardware Configuration Data,

Mono & DSP Port byte.

Reserved (X10)

Default = xxxxxxxx

rbc

res

rbcrbc

rbc

Reserved, backwards compatible.

DAC1 Mute and IFSE Enable (X11)

Default = 110xxxxx

LD1IM

RD1IM

IFSE

res

IFSE

Independent Sample Freq. Enable.

When set to 1, the extended

registers X12 and X13 are used to

set the sample rate, and registers I8,

I10 (OSM1,0), and I22 are ignored.

X12 and X13 cannot be modified un-

less this bit is set to 1.

RD1IM

Right DAC1 Input Mixer Mute.

When set to 1, the output from the

Right DAC1 is muted to the Right in-

put mixer. See Figure 4.

DS253PP2

CS4239

CrystalClear Portable ISA Audio System

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