82G33 datasheet(101/437 Pages) INTEL

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DRAM Controller Registers (D0:F0)

Datasheet

101

Bit

Access &

Default

Description

RW/L

PCIEXBAR Enable (PCIEXBAREN):

0 = The PCIEXBAR register is disabled. Memory read and write

transactions proceed as if there were no PCIEXBAR register.

PCIEXBAR bits 35:26 are R/W with no functionality behind

them.

1 = The PCIEXBAR register is enabled. Memory read and write

transactions whose address bits 35:26 match PCIEXBAR will

be translated to configuration reads and writes within the

(G)MCH. These Translated cycles are routed as shown in the

table above.

This register is locked by Intel® TXT.

5.1.17

DMIBAR—Root Complex Register Range Base Address

B/D/F/Type:

0/0/0/PCI

Address Offset:

68–6Fh

Default Value:

0000000000000000h

Access:

RO, RW/L

Size:

64 bits

This is the base address for the Root Complex configuration space. This window of

addresses contains the Root Complex Register set for the PCI Express Hierarchy

associated with the (G)MCH. There is no physical memory within this 4 KB window

that can be addressed. The 4 KB reserved by this register does not alias to any PCI

2.3 compliant memory mapped space. On reset, the Root Complex configuration space

is disabled and must be enabled by writing a 1 to DMIBAREN [Dev 0, offset 68h, bit 0]

All the Bits in this register are locked in Intel® TXT mode.

Bit

Access

Description

63:36

0000000h

Reserved

35:12

RW/L

000000h

DMI Base Address (DMIBAR): This field corresponds to bits 35:12

of the base address DMI configuration space. BIOS will program this

memory address space. This register ensures that a naturally aligned

4 KB space is allocated within the first 64 GB of addressable memory

space. System Software uses this base address to program the DMI

11:1

000h

Reserved

RW/L

DMIBAR Enable (DMIBAREN):

0 = DMIBAR is disabled and does not claim any memory

1 = DMIBAR memory mapped accesses are claimed and decoded

appropriately

This register is locked by Intel® TXT.

82G33 Datasheet(PDF) 101 Page - Intel Corporation

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