NH82801FBM S L89K Intel, NH82801FBM S L89K Datasheet - Page 376

• 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)
10.4.7
10.4.8
376
OCW1—Operational Control Word 1 (Interrupt Mask)
Register (LPC I/F—D31:F0)
Offset Address:
Default Value:
OCW2—Operational Control Word 2 Register
(LPC I/F—D31:F0)
Offset Address:
Default Value:
Following a part reset or ICW initialization, the controller enters the fully nested mode of
operation. Non-specific EOI without rotation is the default. Both rotation mode and specific EOI
mode are disabled following initialization.
Bit
7:0
Bit
7:5
4:3
2:0
Interrupt Request Mask — R/W. When a 1 is written to any bit in this register, the corresponding
IRQ line is masked. When a 0 is written to any bit in this register, the corresponding IRQ mask bit is
cleared, and interrupt requests will again be accepted by the controller. Masking IRQ2 on the master
controller will also mask the interrupt requests from the slave controller.
Rotate and EOI Codes (R, SL, EOI) — WO. These three bits control the Rotate and End of Interrupt
modes and combinations of the two.
000 = Rotate in Auto EOI Mode (Clear)
001 = Non-specific EOI command
010 = No Operation
011 = *Specific EOI Command
100 = Rotate in Auto EOI Mode (Set)
101 = Rotate on Non-Specific EOI Command
110 = *Set Priority Command
111 = *Rotate on Specific EOI Command
*L0 – L2 Are Used
OCW2 Select — WO. When selecting OCW2, bits 4:3 = “00”
Interrupt Level Select (L2, L1, L0) — WO. L2, L1, and L0 determine the interrupt level acted upon
when the SL bit is active. A simple binary code, outlined below, selects the channel for the command
to act upon. When the SL bit is inactive, these bits do not have a defined function; programming L2,
L1 and L0 to 0 is sufficient in this case.
Code
000b
001b
010b
011b
Master Controller
Slave Controller
00h
Master Controller
Slave Controller
Bit[4:0]=undefined, Bit[7:5]=001
Interrupt Level
IRQ2/10
IRQ3/11
IRQ0/8
IRQ1/9
–
–
–
–
0A1h
0A0h
021h
020h
Intel
Description
Description
®
I/O Controller Hub 6 (ICH6) Family Datasheet
Attribute:
Size:
Attribute:
Size:
Code
000b
001b
010b
011b
Interrupt Level
IRQ4/12
IRQ5/13
IRQ6/14
IRQ7/15
R/W
8 bits
WO
8 bits