參數(shù)資料
型號(hào): 82845GV
廠商: INTEL CORP
元件分類: 外設(shè)及接口
英文描述: Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
中文描述: MULTIFUNCTION PERIPHERAL, PBGA760
封裝: 37.50 X 37.50 MM, 1 MM PITCH, FLIP CHIP, BGA-760
文件頁數(shù): 144/193頁
文件大?。?/td> 2990K
代理商: 82845GV
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System Address
144
Intel
82845G/82845GL/82845GV GMCH Datasheet
Table 5-2
details the location and attributes of the regions. Enabling/disabling these ranges are
described in the GMCH Control Register Device 0 (GC).
Extended SMRAM Address Range (HSEG and TSEG)
The HSEG and TSEG SMM transaction address spaces reside in this extended memory area.
HSEG
SMM-mode processor accesses to enabled HSEG are remapped to 000A0000h–000BFFFFh. Non-
SMM-mode processor accesses to enabled HSEG are considered invalid are terminated
immediately on the PSB. The exceptions to this rule are Non-SMM-mode Write Back cycles that
are remapped to SMM space to maintain cache coherency. AGP and hub interface-originated
cycles to enabled SMM space are not allowed. Physical SDRAM behind the HSEG transaction
address is not remapped and is not accessible.
TSEG
TSEG can be up to 1 MB in size and is at the top of physical memory. SMM-mode processor
accesses to enabled TSEG access the physical SDRAM at the same address. Non-SMM-mode
processor accesses to enabled TSEG are considered invalid and are terminated immediately on the
PSB. The exceptions to this rule are Non-SMM-mode Write Back cycles that are directed to the
physical SMM space to maintain cache coherency. AGP and hub interface-originated cycles to
enabled SMM space are not allowed.
The size of the SMRAM space is determined by the USMM value in the SMRAM register. When
the extended SMRAM space is enabled, non-SMM processor accesses and all other accesses in this
range are forwarded to the hub interface. When SMM is enabled, the amount of memory available
to the system is equal to the amount of physical SDRAM minus the value in the TSEG register.
Table 5-2. Pre-allocated Memory
Memory Segments
Attributes
Comments
00000000h–03E7FFFFh
R/W
Available System Memory 62.5 MB
03E80000h–03F7FFFFh
R/W
Pre-allocated Graphics VGA memory.
1 MB (or 512 K or 8 MB) when IGD is
enabled.
03F80000h–03FFFFFFh
SMM Mode Only - processor
reads
TSEG Address Range
03F80000h–03FFFFFFh
SMM Mode Only - processor
reads
TSEG Pre-allocated Memory
相關(guān)PDF資料
PDF描述
82845Gx Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
82845MP Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845Mx Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845MZ Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845PE 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
82845GX 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
82845MP 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845MX 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845MZ 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845PE 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH)