參數(shù)資料
型號: 82845GL
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): 146/193頁
文件大?。?/td> 2990K
代理商: 82845GL
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁當(dāng)前第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁
System Address
146
Intel
82845G/82845GL/82845GV GMCH Datasheet
5.1.3
AGP Memory Address Ranges
The GMCH can be programmed to direct memory accesses to the AGP bus interface when
addresses are within either of two ranges specified via registers in the GMCH’s Device 1
configuration space. The first range is controlled via the Memory Base Register (MBASE) and
Memory Limit Register (MLIMIT) registers. The second range is controlled via the Prefetchable
Memory Base (PMBASE) and Prefetchable Memory Limit (PMLIMIT) registers.
Conceptually, address decoding for each range follows the same basic concept. The top 12 bits of
the respective Memory Base and Memory Limit registers correspond to address bits A[31:20] of a
memory address. For the purpose of address decoding, the GMCH assumes that address bits
A[19:0] of the memory base are zero and that address bits A[19:0] of the memory limit address are
FFFFFh. This forces each memory address range to be aligned to 1-MB boundary and to have a
size granularity of 1 MB.
The GMCH positively decodes memory accesses to AGP memory address space as defined by the
following equations:
Memory_Base_Address
Address
Memory_Limit_Address
Prefetchable_Memory_Base_Address
Address
Prefetchable_Memory_Limit_Address
The window size is programmed by the plug-and-play configuration software. The window size
depends on the size of memory claimed by the AGP device. Normally these ranges will reside
above the Top-of-Main-DRAM and below High BIOS and APIC address ranges. They normally
reside above the top of memory (TOM) so they do not steal any physical SDRAM memory space.
It is essential to support a separate Prefetchable range to apply the USWC attribute (from the
processor point of view) to that range. The USWC attribute is used by the processor for write
combining.
Note that the GMCH Device 1 memory range registers described above are used to allocate
memory address space for any devices sitting on AGP that require such a window. These devices
would include the AGP device, PCI-66 MHz/1.5 V agents, and multifunctional AGP devices where
one or more functions are implemented as PCI devices.
The PCICMD1 register can override the routing of memory accesses to AGP. In other words, the
Memory Access Enable bit must be set in the Device 1 PCICMD1 register to enable the memory
base/limit and prefetchable base/limit windows.
相關(guān)PDF資料
PDF描述
82845GV Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
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)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
82845GV 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)
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)