Register Description
3.5.1.27
Offset 3Ch: INTRL—Interrupt Line Register (D0:F0, F2)
Offset:
Default Value: 00h
3Ch
Attribute:RW
Size: 8 bits
This register communicates interrupt line routing information.
Bits
Type
Reset
Description
7:0
RW
0
Interrupt Line (INTRL): This register is used to convey the interrupt line
routing information between the initialization code and the device driver. This
is not used by the Intel® 6700PXH 64-bit PCI Hub.
3.5.1.28
Offset 3Dh: INTRP—Interrupt Pin Register (D0:F0, F2)
Offset:
3Dh
Attribute:RW
Size: 8 bits
Default Value: 01h (Function 0)
02h (Function 2)
This register is used to indicate which interrupt virtual wires, if any, the Intel® 6700PXH 64-bit
PCI Hub uses on behalf of internal sources.
Bits
Type
Reset
Description
7:0
RO
Function 0: 01h
Function 2: 02h
Interrupt Pin (INTR): The Intel® 6700PXH 64-bit PCI Hub has an
integrated standard hot plug controller, which is a source of
interrupts. The logical primary bus interrupt pin is INTA# for Function
0, with a corresponding register value of 01h. The interrupt pin is
INTB# for Function 2, with a corresponding register value of 02h.
Note that the hot plug interrupt is routed internally to IRQ#[23] of the
corresponding I/OxAPIC.
3.5.1.29
Offset 3Eh: BRIDGE_CNT—Bridge Control Register
(D0:F0, F2)
Offset:
Default Value: 0000h
3E–3Fh
Attribute: RW, RWC; RO
Size: 16 bits
This register provides extensions to the Command register that are specific to a bridge. The Bridge
Control register provides many of the same controls for the secondary interface that are provided
by the Command register for the primary interface. Some bits affect operation of both interfaces of
the bridge.
Bits
Type
Reset
Description
15:12
11
RO
0
0
Reserved.
RW
Discard Timer SERR Enable (DTSE): Controls the generation of ERR_UNC
on the primary interface in response to a timer discard on the secondary
interface.
0 = Do not generate ERR_UNC on a secondary timer discard
1 = Generate ERR_UNC in response to a secondary timer discard
10
RWC
0
Discard Timer Status (DTS): Software clears this bit by writing a 1 to it.
1 = Secondary discard timer expires (there is no discard timer for the primary
interface)
96
Intel® 6700PXH 64-bit PCI Hub Datasheet
INTEL [ INTEL ]
