6.4.3 MX7A Miscellaneous Control
Default: 0000h
Bit Type
Function
15:11
10
9
8
7:6
5
4
3
2
1
0
NA Reserved
R/W Pin-37 Function Selection (MONO-OUT or Vrefout3)
0: Vrefout3
1: MONO-OUT
R/W Vrefout Off Control
0: Vrefout is normal on (output of buffered Vref).
1: Vrefout is off. (In High-Z).
R/W Vrefout / Vrefout2 / Vrefout3 Level Control
0: 2.5V 1: 4.0V
NA Reserved
R/W Source of Jack-Detect status for MX7A.1
0: MX7A.1 indicates the status of Jack-Detect 1
1: MX7A.1 indicates the status of Jack-Detect 2
R/W HP-OUT Control
0: Normal
1: HP-OUT is muted by H/W when MX7A.1=1
R/W MONO-OUT Control
0: Normal
1: MONO-OUT is muted by H/W when MX7A.1=1
R/W SPDIF Output Gating
0: SPDIF output is not gated with MX7A.1
1: SPDIF output is gated with MX7A.1.
R Status of Jack-Detect 1 or 2 (JDSx)
0: JDSx is pull low
1: JDSx is floating or pull high
R/W LINE-OUT Output Control
0: Normal
1: LINE-OUT output is muted by H/W when MX7A.1=1
ALC250 Data Sheet
6.4.4 MX7C Vendor ID1
The two registers (MX7C Vendor ID1 and MX7E Vendor ID2) contain four 8-bit ID codes. The first three codes have been
assigned by Microsoft for Plug and Play definitions. The fourth code is a Realtek assigned code identifying the ALC250. The
MX7C Vendor ID1 register contains the value 414Ch, which is the first and second characters of the Microsoft ID code. The
MX7C Vendor ID2 register contains the value 4750h, which is the third of the Microsoft ID code
Default: 414Ch
Bit Type
Function
15:0
R Vendor ID “AL”
6.4.5 MX7E Vendor ID2
Default: 4750h
Bit Type
15:8
R Vendor ID - “G”
7:0
R Device ID – 50h for ALC250
Function
Two Channel AC’97 2.3 Audio Codec
23
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