參數資料
型號： RG82845
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項-數據表參考
文件頁數： 119/157頁
文件大?。?/td> 1407K
代理商： RG82845
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PDF資料
PDF描述
RG82845MP Controller Miscellaneous - Datasheet Reference
RG82845MZ Controller Miscellaneous - Datasheet Reference
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
相關代理商/技術參數
參數描述
RG82845 S L5V7 制造商:Intel 功能描述:MEMORY CONTROLLER HUB (MCH) FOR SDR
RG82845 S L5YQ 制造商:Intel 功能描述:MEMORY CONTROLLER HUB (MCH) FOR SDR
RG82845 S L63W 制造商:Intel 功能描述:MEMORY CONTROLLER HUB (MCH) FOR SDR
RG82845 SL5V7 制造商:Intel 功能描述:
RG82845E 制造商:Rochester Electronics LLC 功能描述:- Bulk
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*