Intel 82854 GMCH, 82830M GMCH manual Memory Management Options

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4.1.3Memory Management Options

The memory management options control memory management code.

[HKEY_LOCAL_MACHINE\Drivers\Display\Intel]

MaxFbSize <DWORD>

This key controls the size of the frame buffer in bytes.

830, 854: To compute the frame buffer size required for a given resolution, first compute the width in bytes using the width * bytes per pixel. Then, if that isn't a power of two raise it to the next power of two to get the stride. Finally, compute the total size as stride * height. For example:

720x480 @32bpp use “1E0000”

720x576 @32bpp use “240000”

1280x720 @32bpp use “5A0000”

720x480 @16bpp use “F0000”

720x576 @16bpp use “120000”

1920x1080 @ 32bpp use “870000”

MinVidSurfX <DWORD>

This key sets a minimum size in pixels for a video surface in the horizontal direction. The default minimum width is 16. Note: Do not set this lower than 16.

MinVidSurfY <DWORD>

This key sets a minimum size in lines for a video surface in the vertical direction. The default minimum height is 16. Note: Do not set this key to less than 16.

PageReqLimit <DWORD>

This key limits the number of pages (each page holds 4096 bytes) that can be allocated for video memory. Note: This field is typically not modified.

ReservedMemoryBase <DWORD>

This key is only used for static video memory configurations. It determines the location of video memory in the system. This setting is commented out when using dynamic video memory.

ReservedMemorySize <DWORD>

This key is only used for static video memory configurations. It determines the size of video memory, which starts at the location specified in the registry (ReservedMemoryBase). This setting is commented out when using dynamic video memory.

Intel® Digital Set Top Box Display Driver

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User’s Guide for Microsoft* Windows* CE 5.0

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Contents Intel Digital Set Top Box Display Driver Legal Statements Contents Hardware Limitations Date Driver Description Revision HistoryThis page intentionally left blank Definitions IntroductionDefinitions GMCHs Feature SummaryBase Features Surface Support 2 830 and 854 Base FeaturesDisplay Configuration VBI Support Display Configuration NotesTV Encoders Direct3D Mobile SupportInstalling the MSI Installation NotesDisplay Driver MSI 1 830 MSIRegistry Options Driver FilesDisplay Options Configuration InformationDisplay Driver Options VRWorkaroundModeDWORD AlphaBlendModeDWORDPort Driver TV Encoder DLL Options Memory Management Options SysToVidStretch Dword 4 2D Graphics OptionsBlendFilter Dword BlitSyncVBI DwordVideo Options GDI OptionsForceGRAY16 Dword MaxBackBuffers DwordDirect3D Mobile Options Port Driver Attribute Notes Conexant Port Driver Attributes Port Driver TV Encoder DLL AttributesSilicon Image Port Driver Attributes Focus Port Driver AttributesDefault Configuration Configuration1 830 Default Configuration 2 854 ConfigurationChanging the TV Format to PAL-B Configuration ChangesChanging the TV Output Type to Component Enabling 3D SupportHdmi Support Single, Shadow DVO Modes 854 Chipset Limitations Hardware Limitations830 Chipset Limitations WinCE Graphics Driver Escape Interface Programming InterfaceSummary of Supported Graphics Driver Escape Codes Input Data Structure Output Data Structure IcegdescapeenableportIcegdescapegetnumpdattributes Icegdescapegetavailpdattributes Icegdescapegetavailpdattributes IcegdescapesetpdattributesIcegdescapegetnumpdattributes Null Icegdescapesetovlcolorparams Icegdescapesetfbgammaramp Icegdescapegetmemstats Icegdescapegetmonitordesc Icegdescapevbienable Icegdescapevbidisable Icegdescapevbiupdate Sleep33 Disable vbi ExtEscape Hdc Icegdescapeinterruptinstall Icegdescapeinterruptuninstall Icegdescapesetvideoplanezorder Icegdescapesethwalphacompatmode Icegdescapedriverversion ICEGDESCAPEI2CCONFIG ICEGDESCAPEI2CACCESS Page This escape code is used to select a DVO port master/slave Icegdescapequeryhdmihotplug Null IcegdescapequeryhdmihotplugIcegdescapewaithdmihotplug Null IcegdescapewaithdmihotplugIcegdescapesetscaninfo

82830M GMCH, 82854 GMCH specifications

The Intel 82854 GMCH (Graphics Memory Controller Hub) and the Intel 82830M GMCH are integral components in the architecture of Intel's mobile chipsets, designed to enhance performance and efficiency in laptop and portable computing environments. These chipsets play a crucial role in managing the interactions between the CPU, memory, and graphics, thus impacting overall system performance.

The Intel 82854 GMCH, launched as part of the 855 chipset family, primarily targets mobile laptops and portable devices. A key feature of the 82854 is its support for DDR SDRAM, which improves memory bandwidth and enhances data transfer rates. This chipset is also notable for its integration of graphics capabilities through Intel Graphics Media Accelerator 900. This integration allows for better power management and reduced physical space requirements, making it suitable for compact laptop designs.

Another significant characteristic of the 82854 GMCH is its support for Intel SpeedStep technology, which optimizes power consumption by dynamically adjusting the processor voltage and frequency according to the workload. This capability is essential for prolonging battery life in portable systems without compromising performance during demanding tasks. The chipset also includes support for up to 2GB of memory, catering to the requirements of most mobile applications at the time of its release.

The Intel 82830M GMCH, on the other hand, was part of the 855PM chipset family and is targeted primarily at mainstream laptops. It offers similar features in terms of integrated graphics with the Intel Graphics Media Accelerator. However, it also extends support for advanced features such as the 533 MHz front-side bus, which facilitates quicker data transfer between the CPU and memory.

Key technologies associated with the 82830M GMCH include the Enhanced Intel SpeedStep Technology, which further enhances power management capabilities beyond earlier iterations. By incorporating this technology, the chipset maximizes energy efficiency during various operational states, ensuring that users enjoy longer battery life without sacrificing system performance.

Both chipsets support PCI Express connectivity, providing a pathway for high-speed communication with other peripherals, improving overall system responsiveness. The integration of these technologies into the 82854 and 82830M GMCH models has made them integral to the development of mobile computing, allowing for powerful yet efficient laptop designs that meet the needs of users on the go.

In summary, the Intel 82854 GMCH and 82830M GMCH are foundational components that showcase Intel's commitment to enhancing mobile computing through robust memory and graphics management, advanced power-saving technologies, and seamless integration with modern peripherals. Their influence extends through the generations of mobile devices, reflecting the ongoing innovations within Intel's chipset developments.