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915GL bảng dữ liệu(PDF) 61 Page - Intel Corporation

tên linh kiện 915GL
Giải thích chi tiết về linh kiện  Express Chipset
PDF  426 Pages
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nhà sản xuất  INTEL [Intel Corporation]
Trang chủ  http://www.intel.com
Logo INTEL - Intel Corporation

915GL bảng dữ liệu(HTML) 61 Page - Intel Corporation

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Register Description
R
Datasheet
61
To access this space (steps 1, 2, 3 are performed only once by BIOS)
1.
Use the PCI compatible configuration mechanism to enable the PCI Express enhanced
configuration mechanism by writing 1 to bit 31 of the DEVEN register.
2.
Use the PCI compatible configuration mechanism to write an appropriate PCI Express base
address into the PCIEXBAR register.
3.
Calculate the host address of the register you wish to set using (PCI Express base + (bus
number * 1 MB) + (device number * 32 KB) + (function number * 4 KB) + (1 B * offset
within the function) = host address).
4.
Use a memory write or memory read cycle to the calculated host address to write to or read
from that register.
Base
31
28
20 19
15 14
11
8
2
70
1
Config_Write
X
Bus
Device
Function Extended
Register
Number
27
12
X
PCI Express Configuration Writes
Internally the host interface unit translates writes to PCI Express extended configuration space to
configurations on the backbone. Writes to extended space are posted on the FSB, but non-posted
on the PCI Express* x16 Graphics Interface or DMI pins (i.e., translated to configuration writes).
See the PCI Express Specification for more information on both the PCI 2.3 compatible and PCI
Express enhanced configuration mechanism and transaction rules.



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