ALC250 데이터 시트보기 (PDF) - Unspecified

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ALC250

TWO CHANNEL AC’97 2.3 AUDIO CODEC with EQUALIZER

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ALC250 Data Sheet

6.1.4 MX06 MONO_OUT Volume

Default: 8000h

Register 06h controls the mono volume output. Mono output is the same data sent on all output channels. Each step in bits 4:0

correspond to 1.5dB in increase/decrease in volume, allowing 32 levels of volume from 00000 to 11111.

Bit Type

Function

15

R/W Mute Control 0: Normal 1: Mute (-∞ dB)

14:5

Reserved

4:0

R/W Mono Master Volume (MMV[4:0]) in 1.5 dB steps

For MMV: 00h

1Fh

0 dB attenuation

46.5 dB attenuation

6.1.5 MX0A PC BEEP Volume

Default: 8000h

This register controls the input volume for the PC beep signal. Each step in bits 4:1 correspond to a 3dB increase/decrease in

volume. 16 levels of volume are available, from 0000 to 1111.

The purpose of this register is to allow the PC Beep signals to pass through the ALC250, eliminating the need for an external system

speaker/buzzer. The PC BEEP pin is directly routed (internally hardwired) to the LINE-OUTL & R pins. If the PC speaker/buzzer is

eliminated, it is recommended to connect the external speakers at all times so the POST codes can be heard during reset.

Bit Type

Function

15

R/W Mute Control 0: Normal 1: Mute (-∞ dB)

14:13

Reserved

12:5 R/W Internal PCBEEP Frequency, F[7:0]

The internal PCBEEP frequency is the result of dividing the 48KHz clock by 4 times the number specified

in F[7:0].

The lowest tone is 48KHz/(255*4)=47Hz.

The highest tone is 48KHz/(1*4)=12KHz.

A value of 00h in F[7:0] disables internal PCBEEP generator and allows external PCBEEP input.

4:1

R/W PC Beep Volume (PBV[3:0]) in 3 dB steps

0

Reserved

For PBV: 00h 0 dB attenuation

0Fh 45 dB attenuation

6.1.6 MX0C PHONE Volume

Default: 8008h

Register 0Ch controls the telephone input volume for software modem applications. Because software modem applications may

not have a speaker, the CODEC can offer a speaker-out service. Each step in bits 4:0 correspond to 1.5dB in increase/decrease

in volume, allowing 32 levels of volume, from 00000 to 11111.

Bit Type

Function

15

R/W Mute Control 0: Normal 1: Mute (-∞ dB)

14:5

Reserved

4:0

R/W Phone Volume (PV[4:0]) in 1.5 dB steps

For PV:

00h +12 dB Gain

08h 0dB gain

1Fh -34.5dB Gain

Two Channel AC’97 2.3 Audio Codec

9

Tel: +49(0)234-9351135 · Fax: +49(0)234-9351137 E-MAIL: info@cornelius-consult.de

Rev1.01

http://www.cornelius-consult.de

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