參數(shù)資料
型號(hào)： 82815EM
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項(xiàng)-數(shù)據(jù)表參考
文件頁數(shù)： 18/163頁
文件大小： 1049K
代理商： 82815EM
Intel
82815EM GMCH
R
18
Datasheet
1.8.1.
Intel Dynamic Video Memory Technology (D.V.M.T.)
The internal graphics device on the GMCH2-M supports Intel Dynamic Video Memory Technology.
Intel
D.V.M.T. dynamically responds to application requirements by allocating the proper amount of
display and texturing memory taken from system memory. For the GMCH2-M, a Display Cache (DC)
can be used for Z-buffers (Textures and display buffer are located in system memory). If the display
cache is not used, the Z-buffer is located in system memory.
1.8.2.
Display
The GMCH2-M provides interfaces to a standard progressive scan monitor. This interface is only active
when running in internal graphics mode. The Intel
815EM chipset GMCH2-M directly drives a standard
progressive scan monitor up to a resolution of 1600x1200 pixels.
1.8.3.
Digital Video Out Port (DVO)
The GMCH2-M provides a Digital Video Out port to connect to the Video Controller Hub (VCH) to
connect to CMOS or LVDS flat panel interfaces. The interface has 1.8V signaling to allow it to operate
at higher frequencies. The VCH also has an interface to connect to a TV encoder. The TV encoder must
support the DVO interface.
1.9.
System Clocking
The GMCH2-M has a new type of clocking architecture. It has integrated SDRAM buffers that runs at
100 MHz, regardless of processor side bus frequency. The GMCH2-M uses a 48-MHz clock as the
reference clock (DCLKREF) input for the graphics pixel clock PLL.
1.10. GMCH2-M Power Delivery
The GMCH2-M core voltage is 1.8V. System Memory runs off of a 3.3V supply. Display cache
memory runs off of the AGP 3.3V supply. AGP 1X/2X I/O can run off of either a 3.3V or a 1.5V
supply. AGP 4X I/O requires a 1.5V supply. The AGP interface voltage is determined by the VDDQ
generation on the motherboard.
1.11. References
GTL+ I/O Specification: Contained in the Pentium
II Processor Databook
PCI Local
bus Specification 2.2
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