ALC202 데이터 시트보기 (PDF) - Realtek Semiconductor

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ALC202

TWO CHANNEL AC97 AUDIO CODEC

Realtek Semiconductor 

ALC202/ALC202A

6.1.21 MX32 PCM ADC Rate

Default: BB80h

The ALC202 allows adjustment of the surround output sample rate. This register is used to adjust the sample rate. By changing

the values, sampling rates from 8000 to 48000 can be chosen.

Bit Type

15:0 R/W Output Sampling Rate: FISR[15:0]

Function

The ALC202 supports the following sampling rates, as required in the PC99/PC2001 design guide.

Sampling rate

FISR[15:0]

8000

1F40h

11025

2B11h

12000

2EE0

16000

3E80h

22050

5622h

24000

5DC0

32000

7D00h

44100

AC44h

48000

BB80h

Note that If the value written is not support, the closest value is returned.

When MX2A.0=0 (VRA is disable), this register will return BB80h when read.

6.1.22 MX3A S/PDIF Channel Status and Control

Default: 2000h

Bit Type

Function

15

14

13:12

11

10:4

3

2

1

0

R/W Validity Control: Control V bit in Sub-Frame.

1: The V bit in sub-frame is always send as 1 to indicate the invalid data is not

suitable for receiver.

0: The V bit (valid flag) in sub-frame depends on whether the S/PDIF data is under-run or over-run.

R Double Rate S/PDIF: (DRS)

The ALC202 does not support double rate S/PDIF. This bit is always 0.

R/W S/PDIF Sample Rate: SPSR[1:0]

00: Sample rate set to 44.1KHz, Fs[0:3]=0000

01: Reserved

10: Sample rate set to 48.0KHz, Fs[0:3]=0100 (default)

11: Sample rate set to 32.0KHz, Fs[0:3]=1100

R/W Generation Level (LEVEL)

R/W Category Code (CC[6:0])

R/W Preemphasis: (PRE)

1: Filter preemphasis is 50/15 µsec 0: None

R/W Copyright: (COPY)

1: Asserted 0: Not asserted

R/W Non-Audio Data Type: (/AUDIO)

1: AC3 or other digital non-audio data 0: PCM data

R Professional or Consumer Format: (PRO)

1: Professional format 0: Consumer format

The ALC202 supports consumer channel status format, so this bit is always 0.

2002/07/30

19

Rev.1.28

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