Processor Configuration Registers
Intel
®
Core
TM
i7-660UE, i7-620LE/UE, i7-610E, i5-520E, i3-330E and Intel
®
Celeron
®
Processor P4505, U3405 Series
Datasheet Addendum
August 2010
104
Document Number: 323178-003
5
RO
0b
Core
Master Abort Mode (MAMODE)
Does not apply to PCI Express. Hard wired to 0.
4
RW
0b
Core
VGA 16-bit Decode (VGA16D)
Enables the PCI-to-PCI bridge to provide 16-bit decoding of VGA
I/O address precluding the decoding of alias addresses every 1
KB. This bit only has meaning if Bit 3 (VGA Enable) of this
register is also set to 1, enabling VGA I/O decoding and
forwarding by the bridge.
0 = Execute 10-bit address decodes on VGA I/O accesses.
1 = Execute 16-bit address decodes on VGA I/O accesses.
3
RW
0b
Core
VGA Enable (VGAEN)
Controls the routing of CPU initiated transactions targeting VGA
compatible I/O and memory address ranges. See the VGAEN/
MDAP table in device 0, offset 97h[0].
2
RW
0b
Core
ISA Enable (ISAEN)
Needed to exclude legacy resource decode to route ISA
resources to legacy decode path. Modifies the response by the
processor to an I/O access issued by the CPU that target ISA I/O
addresses. This applies only to I/O addresses that are enabled by
the IOBASE and IOLIMIT registers.
0 = All addresses defined by the IOBASE and IOLIMIT for CPU I/
O transactions is mapped to PCI Express-G.
1 = Processor will not forward to PCI Express-G any I/O
transactions addressing the last 768 bytes in each 1-KB
block even if the addresses are within the range defined by
the IOBASE and IOLIMIT registers.
1
RW
0b
Core
SERR Enable (SERREN)
0 = No forwarding of error messages from secondary side to
primary side that could result in an SERR.
1 = ERR_COR, ERR_NONFATAL, and ERR_FATAL messages result
in SERR message when individually enabled by the Root
Control register.
0
RW
0b
Core
Parity Error Response Enable (PEREN)
Controls whether or not the Master Data Parity Error bit in the
Secondary Status register is set when the PROCESSOR receives
across the link (upstream) a Read Data Completion Poisoned TLP
0 = Master Data Parity Error bit in Secondary Status register
CANNOT be set.
1 = Master Data Parity Error bit in Secondary Status register
CAN be set.
Table 47. BCTRL6 - Bridge Control Register (Sheet 2 of 2)
Bit
Access
Default
Value
RST/
PWR
Description