307013-003 Datasheet, PDF (402/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

LPC Interface Bridge Registers (D31:F0)
10.4.10 ELCR1—Master Controller Edge/Level Triggered Register
(LPC I/F—D31:F0)
Offset Address: 4D0h
Default Value: 00h
Attribute:
Size:
R/W
8 bits
In edge mode, (bit[x] = 0), the interrupt is recognized by a low to high transition. In
level mode (bit[x] = 1), the interrupt is recognized by a high level. The cascade
channel, IRQ2, the heart beat timer (IRQ0), and the keyboard controller (IRQ1),
cannot be put into level mode.
Bit
IRQ7 ECL — R/W.
7 _{0 = Edge.}
1 = Level.
IRQ6 ECL — R/W.
6 0 = Edge.
1 = Level.
IRQ5 ECL — R/W.
5 0 = Edge.
1 = Level.
IRQ4 ECL — R/W.
4 _{0 = Edge.}
1 = Level.
IRQ3 ECL — R/W.
3 _{0 = Edge.}
1 = Level.
2:0 Reserved. Must be 0.
Description
402
Intel ^® ICH7 Family Datasheet