參數(shù)資料
型號: RG82845MZ
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù): 119/157頁
文件大?。?/td> 1407K
代理商: RG82845MZ
Intel
82845MP/82845MZ Chipset-Mobile (MCH-M)
64
Datasheet
250687-002
R
3.7.21.
PAM[0:6] – Programmable Attribute Map Registers – Device #0
Address Offset:
90-96h
Default Value:
00h
Attribute:
Read/Write, Read Only
Size:
8 bits
The MCH-M allows programmable memory attributes on 13 Legacy memory segments of various sizes
in the 640 Kbytes to 1 Mbytes address range. Seven Programmable Attribute Map (PAM) Registers are
used to support these features. Cacheability of these areas is controlled via the MTRR registers in the
processor. Two bits are used to specify memory attributes for each memory segment. These bits apply to
host initiator only access to the PAM areas. MCH-M will forward to main memory for any A.G.P., PCI,
or hub interface A initiated accesses to the PAM areas. These attributes are:
RE -
Read Enable. When RE = 1, the host read accesses to the corresponding memory segment
are claimed by the MCH-M and directed to main memory. Conversely, when RE = 0, the host read
accesses are directed to PCI0.
WE -
Write Enable. When WE = 1, the host write accesses to the corresponding memory segment
are claimed by the MCH-M and directed to main memory. Conversely, when WE = 0, the host write
accesses are directed to PCI0.
The RE and WE attributes permit a memory segment to be Read Only, Write Only, Read/Write, or
disabled. For example, if a memory segment has RE = 1 and WE = 0, the segment is Read Only.
Each PAM Register controls two regions, typically 16 Kbytes in size. Each of these regions has a 4-bit
field. The four bits that control each region have the same encoding and are defined in the following
table.
相關(guān)PDF資料
PDF描述
RG82870P2 Controller Miscellaneous - Datasheet Reference
RH5RE36AA-T1-FA 3.6 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PSSO3
RH5RE56AA-T1-FA 5.6 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PSSO3
RE5RE36AA-TZ-FC 3.6 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PBCY3
RE5RE36AC-TZ-FC 3.6 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PBCY3
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RG82845PE S L6H5 制造商:Intel 功能描述:CHIPSTGMCH 82845PE HT-PBGA760
RG82845PESL6Q3 制造商:Intel 功能描述:Chipsets
RG82845-SL5V7 制造商:Intel 功能描述:INTEL 845G GRAPHICS AND MEMORY CONTROLLER HUB(GMCH)
RG82845SL5YQ 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel?? 845 Chipset: 82845 Memory Controller Hub (MCH) for SDR
RG82845-SL63W 制造商:Intel 功能描述:INTEL 845G GRAPHICS AND MEMORY CONTROLLER HUB(GMCH)