alc850 Realtek Semiconductor Corporation, alc850 Datasheet - Page 24

• Manufacturer Part Number: alc850
• Description: Eight Channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

7.1.14.
Default: 0000h
Eight Channel AC’97 2.3 Audio Codec
10:4
3:0
Bit
15
14
13
12
11
MX24 Audio Interrupt and Paging
Type
R/W
R/W
R/W
NA
R
R
Reserved. Read as 0
Function
Interrupt Status, I4
0: Interrupt is clear
1: Interrupt was generated
Interrupt event and status are clear by writing a 1 to this bit. The status will change regardless of
interrupt enable (I0)
Interrupt Cause, I3
Reserved. Read as 0
Interrupt Cause, I2
I2=0: Sense value in page ID-01h MX6A[12:8] has not changed
1: Sense cycle completed or new sense value in page ID-01h MX6A[12:8] is available
This bit reflects the cause of the first interrupt event generated. Software should read it after the
interrupt status (I4) has been confirmed as interrupting. I2 will be zero when I4 is cleared
Sense Cycle, I1
0: Sense cycle not in progress
1: Sense cycle start
Writing a ‘1’ to this bit causes a sense cycle start. If a sense cycle is in progress, writing a ‘0’ to this
bit will abort the sense cycle
Whether the data in the sense result register (page ID-01h MX6A) is valid or not is determined by the
IV bit in MX6A, Page ID-1h
Interrupt Enable, I0
0: Interrupt is masked. Interrupt status (I4) will not be shown in bit 0 of Slot 12 in SDATA-IN
1: Interrupt is un-masked. Interrupt status (I4) will be shown in bit 0 of Slot 12 in SDATA-IN
This bit controls the interrupt of the sense cycle
Page Selector, PG[3:0]
0000b: Vendor Specific
0001b: Page ID 01 (AC’97 2.3 Discovery Descriptor Definition)
Others: Reserved
This register is used to select a descriptor of 16 word pages between registers MX60 and MX6F. A
value of 0 is used to select vendor specific space to maintain compatibility with the AC’97 2.2 vendor
specific register. When PG[3:0] is not 0000b or 0001b, the ALC850 will return zero data for the
ACLINK mixer read command
Table 19. MX24 Audio Interrupt and Paging
16
Track ID: JATR-1076-21 Rev. 1.4
Datasheet
ALC850