Intel 6 SERIES CHIPSET - DATASHEET 01-2011 Datasheet page 721

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Integrated Intel High Definition Audio Controller Registers
17.1.2.26 RINTCNT—Response Interrupt Count Register
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(Intel
Memory Address:HDBAR + 5Ah
Default Value:
Bit
15:8 Reserved.
N Response Interrupt Count — R/W.
0000 0001b = 1 response sent to RIRB
...........
1111 1111b = 255 responses sent to RIRB
0000 0000b = 256 responses sent to RIRB
The DMA engine should be stopped when changing this field or else an interrupt may be
7:0
lost.
Note that each response occupies 2 DWords in the RIRB.
This is compared to the total number of responses that have been returned, as opposed
to the number of frames in which there were responses. If more than one codecs
responds in one frame, then the count is increased by the number of responses
received in the frame.
17.1.2.27 RIRBCTL—RIRB Control Register
®
(Intel
Memory Address:HDBAR + 5Ch
Default Value:
Bit
7:3 Reserved.
Response Overrun Interrupt Control — R/W. If this bit is set, the hardware will
2 generate an interrupt when the Response Overrun Interrupt Status bit (HDBAR + 5Dh:
bit 2) is set.
Enable RIRB DMA Engine — R/W.
0 = DMA stop
1 = DMA run
1
After software writes a 0 to this bit, the hardware may not stop immediately. The
hardware will physically update the bit to 0 when the DMA engine is truly stopped.
Software must read a 0 from this bit to verify that the DMA engine is truly stopped.
Response Interrupt Control — R/W.
0 = Disable Interrupt
0
1 = Generate an interrupt after N number of responses are sent to the RIRB buffer OR
Datasheet
High Definition Audio Controller—D27:F0)
0000h
High Definition Audio Controller—D27:F0)
00h
when an empty Response slot is encountered on all SDI[x] inputs (whichever
occurs first). The N counter is reset when the interrupt is generated.
Attribute: R/W
Size: 16 bits
Description
Attribute: R/W
Size: 8 bits
Description
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