Hub Datasheet
Intel
®
E7505 Chipset MCH Datasheet 115
Register Description
3.7.25 ERRSTS1—Error Status Register (D1:F0)
Address Offset: 42h
Default Value: 00h
Attribute: R/WC
Size: 8 bits
Set by drivers.
Note: Software writes a 1 to clear bits that are set.
3.7.26 AGPCAPID1—AGP Capability Identifier Register (D1:F0)
Address Offset: 60–63h
Default Value: 0035 0002h
Attribute: RO
Size: 32 bits
This register provides standard identifier for AGP capability. Read by drivers.
Bits
Default,
Access
Description
7:4 Reserved
3
0b
R/WC
AGP Access Outside of Graphics Aperture Flag (OOGF).
1 = AGP access occurred to an address outside of the graphics aperture range. This
bit will be set for accesses outside of the aperture for AGP 2.0 low- and high-
priority cycles. It will not be set for AGP 3.0 async cycles.
2
0b
R/WC
Invalid AGP Access Flag (IAAF).
1 = AGP access was attempted outside of the graphics aperture and either to the
640 KB – 1 MB range or above the top of low memory.
1
0b
R/WC
Invalid Graphics Aperture Translation Table Entry (ITTEF).
1 = Invalid translation table entry was returned in response to an AGP access to the
graphics aperture.
0 Reserved
Bits
Default,
Access
Description
31:24 Reserved
23:20
3h
RO
Major AGP Revision Number (MAJREV). These bits provide a major revision number
of AGP specification to which this version of MCH conforms. This field is hardwired to
value of 0011b (i.e., implying AGP Specification 3.0).
19:16
5h
RO
Minor AGP Revision Number (MINREV). These bits provide a minor revision number of
AGP specification to which this version of MCH conforms. This number is hardwired to
value of 0101 which implies that the revision is x.5. Together with major revision number
this field identifies the MCH as an AGP Specification 3.0 compliant device.
15:8
00h
RO
Next Capability Pointer (NCAPTR). AGP capability is the first and the last capability
described via the capability pointer mechanism; therefore, these bits are hardwired to 0
to indicate the end of the capability linked list.
7:0
02h
RO
AGP Capability ID (CAPID). This field identifies the linked list item as containing AGP
registers. This field has a value of 0000_0010b assigned by the PCI SIG. This value may
be changed by the AGP BIOS Configuration register 1.