參數(shù)資料
型號: RG82870P2
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): 91/157頁
文件大?。?/td> 1407K
代理商: RG82870P2
Intel
82845MP/82845MZ Chipset-Mobile (MCH-M)
250687-002
Datasheet
39
R
“Reserved” register location is read, a random value is returned. (“Reserved” registers can be 8-bit, 16-
bit, or 32-bit in size.) Writes to “Intel Reserved” registers may cause system failure. Reads to “Intel
Reserved” registers may return a non-zero value.
Default Value Upon Reset:
Upon a full Reset, the MCH-M sets all of its internal configuration registers to predetermined default
states. Some register values at reset are determined by external strapping options. The default state
represents the minimum functionality feature set required to successfully bring up the system. Hence, it
does not represent the optimal system configuration. It is the responsibility of the system initialization
software (usually BIOS) to properly determine the DRAM configurations, operating parameters and
optional system features that are applicable, and to program the MCH-M registers accordingly.
3.5.
I/O Mapped Registers
The MCH-M contains two registers that reside in the CPU I/O address space: the Configuration Address
(CONFIG_ADDRESS) Register and the Configuration Data (CONFIG_DATA) Register. The
Configuration Address Register enables/disables the configuration space and determines what portion of
configuration space is visible through the Configuration Data window.
3.5.1.
CONFIG_ADDRESS – Configuration Address Register
I/O Address:
0CF8h Accessed as a Dword
Default Value:
00000000h
Access:
Read/Write
Size:
32 bits
CONFIG_ADDRESS is a 32-bit register that can be accessed only as a Dword. A Byte or Word
reference will "pass through" the Configuration Address Register and the hub interface, onto the PCI bus
as an I/O cycle. The CONFIG_ADDRESS register contains the Bus Number, Device Number, Function
Number, and Register Number for which a subsequent configuration access is intended.
Figure 2. Configuration Address Register
R
1 0
2
7
8
11
15
16
23
24
30
31
10
R0
0
Reserved
Register Number
Function Number
Device Number
Bus Number
Reserved
Enable
Bit
Default
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