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Register Description
D15343-003 57
4.8.12 CAPID – Capabilities Identification Register (Device #0)
The Capability Identification Register uniquely identifies chipset capabilities as defined in the
table below. The bits in this register are intended to define a capability ceiling for each feature, not
a capability select. The capability selection for each feature is implemented elsewhere. The
mechanism to select the capability for each feature must comprehend these Capability registers and
not allow a selected setting above the ceiling specified in these registers. The BIOS must read this
register to identify the part and comprehend the capabilities specified within when configuring the
effected portions of the GMCH.
The default setting, in most cases, allows the maximum capability. Exceptions are noted in the
individual bits. This register is Read Only. Writes to this register have no effect.
Address Offset:
Default Value:
Access:
Size:
40-44h
chipset independent
Read Only
40 bits
Bit Descriptions
39:37 Capability ID [2:0]:
000: Intel
®
82854 GMCH
001-111: Reserved
36:28 Reserved
27:24 CAPREG Version: This field has the value 0001b to identify the first revision of the CAPREG
definition.
23:16 Cap_length: This field has the value 05h indicating the structure length.
15:0 Reserved