82NM10 Datasheet, PDF (389/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

LPC Interface Bridge Registers (D31:F0)
Bit
Description
2 Master/Slave in Buffered Mode — WO. Not used.
0 = Should always be programmed to 0.
1 Automatic End of Interrupt (AEOI) — WO.
0 = This bit should normally be programmed to 0. This is the normal end of interrupt.
1 = Automatic End of Interrupt (AEOI) mode is programmed.
0 Microprocessor Mode — WO.
1 = Must be programmed to 1 to indicate that the controller is operating in an Intel
Architecture-based system.
13.4.7
13.4.8
OCW1—Operational Control Word 1 (Interrupt Mask)
Register (LPC I/F—D31:F0)
Offset Address: Master Controller – 021h
Slave Controller – 0A1h
Default Value: 00h
Attribute:
Size:
R/W
8 bits
Bit
Description
7:0 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.
OCW2—Operational Control Word 2 Register
(LPC I/F—D31:F0)
Offset Address: Master Controller – 020h Attribute:
Slave Controller – 0A0h Size:
Default Value: Bit[4:0]=undefined, Bit[7:5]=001
WO
8 bits
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
Description
7:5 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
4:3 OCW2 Select — WO. When selecting OCW2, bits 4:3 = “00”
Datasheet
389