alc658 Realtek Semiconductor Corporation, alc658 Datasheet - Page 19

• Manufacturer Part Number: alc658
• Description: Six-channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

6.1.14. MX24 Audio Interrupt and Paging
Default: 0000h
Six-Channel AC’97 2.3 Audio Codec
10:4
3:0
Bit
15
14
13
12
11
Type
R/W
R/W
R/W
NA
R
R
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 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.
Reserved. Read as 0
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 ALC658 will return zero data for the
ACLINK mixer read command.
Table 19. MX24 Audio Interrupt and Paging
15
Datasheet
ALC658
Rev. 1.3