82801FB Datasheet, PDF (375/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

LPC Interface Bridge Registers (D31:F0)
10.4.5
10.4.6
ICW3—Slave Controller Initialization Command
Word 3 Register (LPC I/F—D31:F0)
Offset Address: A1h
Default Value: All bits undefined
Attribute:
Size:
WO
8 bits
Bit
Description
7:3 0 = These bits must be programmed to 0.
Slave Identification Code — WO. These bits are compared against the slave identification code
broadcast by the master controller from the trailing edge of the first internal INTA# pulse to the
2:0
trailing edge of the second internal INTA# pulse. These bits must be programmed to 02h to match
the code broadcast by the master controller. When 02h is broadcast by the master controller during
the INTA# sequence, the slave controller assumes responsibility for broadcasting the interrupt
vector.
ICW4—Initialization Command Word 4 Register
(LPC I/F—D31:F0)
Offset Address:
Default Value:
Master Controller – 021h
Slave Controller – 0A1h
01h
Attribute:
Size:
WO
8 bits
Bit
Description
7:5 0 = These bits must be programmed to 0.
Special Fully Nested Mode (SFNM) — WO.
4 _{0 = Should normally be disabled by writing a 0 to this bit.}
1 = Special fully nested mode is programmed.
Buffered Mode (BUF) — WO.
3
0 = Must be programmed to 0 for the ICH6. This is non-buffered mode.
Master/Slave in Buffered Mode — WO. Not used.
2
0 = Should always be programmed to 0.
Automatic End of Interrupt (AEOI) — WO.
1 _{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.
Microprocessor Mode — WO.
0 1 = Must be programmed to 1 to indicate that the controller is operating in an Intel
Architecture-based system.
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
375