12th Generation Intel® Core™ Processor Datasheet Volume 2 of 2
ID | Date | Version | Classification |
---|---|---|---|
767626 | 07/13/2023 | Public |
Multi Size Aperture Control (MSAC_0_2_0_PCI) – Offset 60
This register contains MSAC register which determines the size of the graphics memory aperture (GMADR) in function 0 and in the trusted space, and affects certain bits of the GMADR register.
Bits [20:16] 00000b: 128MB, GMADR[26:4] is hardwired to all 0
Bits [20:16] 00001b: 256MB, GMADR[27:4] overridden to all 0
Bits [20:16] 00010b: illegal (hardware will treat this as 00011b)
Bits [20:16] 00011b: 512MB, GMADR[28:27] overridden to all 0
Bits [20:16] 00100-00110b: illegal (hardware will treat this as 00111b)
Bits [20:16] 00111b: 1024MB, GMADR[29:27] overridden to all 0
Bits [20:16] 01000-01110b: illegal (hardware will treat this as 01111b)
Bits [20:16] 01111b: 2048MB, GMADR[30:27] overridden to all 0
Bits [20:16] 10000-11110b: illegal (hardware will treat this as 11111b)
Bits [20:16] 11111b: 4096MB, GMADR[31:27] overridden to all 0
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
31:21 | 0h | RO | Reserved |
20 | 0x0 | RW/V | Untrusted Aperture Size Bit 4 (APSZ4) Untrusted Aperture Size Bit 4 |
19 | 0x0 | RW/V | Untrusted Aperture Size Bit 3 (APSZ3) Untrusted Aperture Size Bit 3 |
18 | 0x0 | RW/V | Untrusted Aperture Size Bit 2 (APSZ2) Untrusted Aperture Size Bit 2 |
17 | 0x0 | RW/V | Untrusted Aperture Size Bit 1 (APSZ1) Untrusted Aperture Size Bit 1 |
16 | 0x0 | RW/V | Untrusted Aperture Size Bit 0 (APSZ0) Untrusted Aperture Size Bit 0 |
15:0 | 0h | RO | Reserved |