Intel A2Y15AV Ficha Técnica descarregar pdf (Página 70)

Processor Configuration Registers

70 Datasheet, Volume 2

2.5.26 PAM5—Programmable Attribute Map 5 Register

This register controls the read, write and shadowing attributes of the BIOS range from

E_0000h to E_7FFFh. The Uncore allows programmable memory attributes on 13

legacy memory segments of various sizes in the 768 KB to 1 MB address range. Seven

Programmable Attribute Map (PAM) registers are used to support these features.

Cacheability of these areas is controlled using the MTRR register in the core.

Two bits are used to specify memory attributes for each memory segment. These bits

apply to host accesses to the PAM areas. These attributes are:

• RE – Read Enable. When RE=1, the host read accesses to the corresponding

memory segment are claimed by the Uncore and directed to main memory.

Conversely, when RE=0, the host read accesses are directed to DMI.

• WE – Write Enable. When WE=1, the host write accesses to the corresponding

memory segment are claimed by the Uncore and directed to main memory.

Conversely, when WE=0, the host read accesses are directed to DMI.

The RE and WE attributes permit a memory segment to be Read Only, Write Only,

Read/Write or Disabled. For example, if a memory segment has RE=1 and WE=0, the

segment is Read Only.

B/D/F/Type: 0/0/0/PCI

Address Offset: 85h

Reset Value: 00h

Access: RW

Size: 8 bits

BIOS Optimal Default 0h

Bit Access

Reset

Value

RST/

PWR

Description

7:6 RO 0h Reserved (RSVD)

5:4 RW 00b Uncore

0E4000–0E7FFF Attribute (HIENABLE)

This field controls the steering of read and write cycles that

address the BIOS area from 0E4000h to 0E7FFFh.

00 = DRAM Disabled. All accesses are directed to DMI.

01 = Read Only. All reads are sent to DRAM, all writes are

forwarded to DMI.

10 = Write Only. All writes are sent to DRAM, all reads are

serviced by DMI.

11 = Normal DRAM Operation. All reads and writes are serviced

by DRAM.

This register is locked by Intel TXT.

3:2 RO 0h Reserved (RSVD)

1:0 RW 00b Uncore

0E0000–0E3FFF Attribute (LOENABLE)

This field controls the steering of read and write cycles that

address the BIOS area from 0E0000h to 0E3FFFh.

00 = DRAM Disabled. All reads are sent to DRAM. All writes are

forwarded to DMI.

01 = Read Only. All reads are sent to DRAM. All writes are

forwarded to DMI.

10 = Write Only. All writes are sent to DRAM. All reads are

serviced by DMI.

11 = Normal DRAM Operation. All reads and writes are serviced

by DRAM.

This register is locked by Intel TXT.

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 341 342

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