82830MP Datasheet, PDF (45/159 Pages) Intel Corporation – Intel 830MP Chipset: 82830MP Graphics and Memory Controller Hub (GMCH-M)

Intel^® 830MP Chipset
R
4.4.2
CONFIG_DATA - Configuration Data Register
I/O Address:
Default Value:
Access:
Size:
0CFCh
00000000h
Read/Write
32 bits
CONFIG_DATA is a 32-bit read/write window into configuration space. The portion of configuration
space that is referenced by CONFIG_DATA is determined by the contents of CONFIG_ADDRESS.
31
0
0 Bit
Default
Configuration Data Window
Bit
Descriptions
31:0 Configuration Data Window (CDW). If bit 31 of CONFIG_ADDRESS is 1, any I/O access to the
CONFIG_DATA register will be mapped to configuration space using the contents of
CONFIG_ADDRESS.
4.5
GMCH-M Internal Device Registers
Table 18 below shows the nomenclature of access attributes for the configuration space of each device.
Table 18. Nomenclature for Access Attributes
RO
Read Only. If a register is read only, writes to this register have no effect.
R/W
Read/Write. A register with this attribute can be read and written
R/WC
Read/Write Clear. A register bit with this attribute can be read and written. However, a write of a 1
clears (sets to 0) the corresponding bit and a write of a 0 has no effect.
R/WO Read/Write Once. A register bit with this attribute can be written to only once after power up. After
the first write, the bit becomes read only.
L
Lock. A register bit with this attribute becomes Read Only after a lock bit is set.
298338-001
Datasheet
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