alc250-lf Realtek Semiconductor Corporation, alc250-lf Datasheet - Page 26

• Manufacturer Part Number: alc250-lf
• Description: Two-channel Ac?97 2.3 Audio Codec With Equalizer
• Manufacturer: Realtek Semiconductor Corporation

6.3.4 MX68 Sense Function Information
Default: 02F1h
6.3.5 MX6A Sense Detail
Default: 0000h
Two-Channel AC’97 2.3 Audio Codec
15:11
15:13
12:8
Bit
9:5
3:1
Bit
7:0
10
4
0
Type
Type
R/W
R/W
R/W
R/W
R/W
NA
R
R
R
Gain bits, G[4:0]
These bits are updated by BIOS to tell driver the gain supported by external amplifier. 1 LSB = 1.5dBV
Inversion bit, INV
Buffer delays, DL[4:0]
Delay measurement for the signal from inputs to outputs channels in 20.83 usec (1/48000 second) units.
Information Valid bit, IV
Reserved
Function Information Present, FIP
This bit is set to a ‘1’ indicates that the G[4:0], INV, DL[4:0] and ST[2:0] bits are supported and are
Read/Write capable.
Connection/Jack Location bits, ST[2:0]
These bits should be written by BIOS to let driver know where those I/O FC[3:0] specify are located.
Sense bits, S[4:0] (Default value depends on sensed result after Cold Reset)
For output devices:
For input deices:
This field reports the type of output/input peripheral plugged in the jack after sensing.
Always read as 0.
00000b: 0dBV, 00001b: +1.5dBV,… 01111b:+24dBV
10000b: 0dBV, 10001b: -1.5dBV,… 11111b: -24dBV
Clearing this bit by writing “1”, writing “0” to this bit has no effect.
011b: Dock/External
100b ~ 110b: Reserved
0: No inversion reported
000b: Rear I/O Panel (Default)
001b: Front Panel
010b: Motherboard
111b: Unused I/O.
0: After a sense cycle is completed indicates that no information is provided on the sensing method
1: After a sense cycle is completed indicates that information is provided on the sensing method
02h: Not specificed or unknown 05h: Powered speaker
Other: Not supported
12h: Not specified or unknown
Other: Not supported
1: Inverted.
13h: Mono Microphone 15h: Stereo Line-In
21
Function
Function
06h: Earphone or passive speaker
ALC250 DataSheet
Rev1.3