NH82801FBM S L89K Intel, NH82801FBM S L89K Datasheet - Page 352

• Manufacturer Part Number: NH82801FBM S L89K
• Manufacturer: Intel

Specifications of NH82801FBM S L89K

• Lead Free Status / RoHS Status: Compliant

LPC Interface Bridge Registers (D31:F0)
10.1.17
352
SIRQ_CNTL—Serial IRQ Control Register
(LPC I/F—D31:F0)
Offset Address:
Default Value:
Lockable:
Bit
5:2
1:0
7
6
Serial IRQ Enable (SIRQEN) — R/W.
0 = The buffer is input only and internally SERIRQ will be a 1.
1 = Serial IRQs will be recognized. The SERIRQ pin will be configured as SERIRQ.
Serial IRQ Mode Select (SIRQMD) — R/W.
0 = The serial IRQ machine will be in quiet mode.
1 = The serial IRQ machine will be in continuous mode.
NOTE: For systems using Quiet Mode, this bit should be set to 1 (Continuous Mode) for at least one
Serial IRQ Frame Size (SIRQSZ) — RO. This field is fixed to indicate the size of the SERIRQ frame
as 21 frames.
Start Frame Pulse Width (SFPW) — R/W. This is the number of PCI clocks that the SERIRQ pin will
be driven low by the serial IRQ machine to signal a start frame. In continuous mode, the ICH6 will
drive the start frame for the number of clocks specified. In quiet mode, the ICH6 will drive the start
frame for the number of clocks specified minus one, as the first clock was driven by the peripheral.
00 = 4 clocks
01 = 6 clocks
10 = 8 clocks
11 = Reserved
frame after coming out of reset before switching back to Quiet Mode. Failure to do so will
result in the ICH6 not recognizing SERIRQ interrupts.
64h
10h
No
Intel
Description
®
I/O Controller Hub 6 (ICH6) Family Datasheet
Attribute:
Size:
Power Well:
R/W, RO
Core
8 bit