82830MP datasheet(45/159 Pages) INTEL

45 / 159 page

Intel

® 830MP Chipset

298338-001

Datasheet

4.4.2

CONFIG_DATA - Configuration Data Register

I/O Address:

0CFCh

Default Value:

00000000h

Access:

Read/Write

Size:

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.

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

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.

Lock. A register bit with this attribute becomes Read Only after a lock bit is set.

82830MP Datasheet(PDF) 45 Page - Intel Corporation