參數(shù)資料
型號： 82815EM
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)： 57/163頁
文件大小： 1049K
代理商： 82815EM
Intel
82815EM GMCH
R
Datasheet
57
Table 6. Attribute Bit Assignments
7
6
5
4
3
2
1
0
Description
R
R
0
0
R
R
0
0
Disabled.
DRAM is disabled and all accesses are directed to the hub interface. The
GMCH2-M does not respond as a AGP/PCI or hub interface target for any read or write
access to this area.
R
R
0
1
R
R
0
1
Read Only
. Reads are forwarded to DRAM and writes are forwarded to the hub
interface for termination. This write protects the corresponding memory segment. The
GMCH2-M will respond as a AGP/PCI or hub interface target for read accesses but not
for any write accesses.
R
R
1
0
R
R
1
0
Write Only
. Writes are forwarded to DRAM and reads are forwarded to the hub
interface for termination. The GMCH2-M will respond as a AGP/PCI or hub interface
target for write accesses but not for any read accesses.
R
R
1
1
R
R
1
1
Read/Write
. This is the normal operating mode of main memory. Both read and write
cycles from the host are claimed by the GMCH2-M and forwarded to DRAM. The
GMCH2-M will respond as a AGP/PCI or hub interface target for both read and write
accesses.
As an example, consider a BIOS that is implemented on the expansion bus. During the initialization
process, the BIOS can be shadowed in main memory to increase the system performance. When BIOS is
shadowed in main memory, it should be copied to the same address location. To shadow the BIOS, the
attributes for that address range should be set to write only. The BIOS is shadowed by first doing a read
of that address. This read is forwarded to the expansion bus. The host then does a write of the same
address, which is directed to main memory. After the BIOS is shadowed, the attributes for that memory
area are set to read only so that all writes are forwarded to the expansion bus. The table above and the
figure below show the PAM registers and the associated attribute bits:
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