![](http://datasheet.mmic.net.cn/340000/82865G_datasheet_16452471/82865G_84.png)
Intel
82865G/82865GV GMCH Datasheet
85
Register Description
3.5.33
ERRCMD—Error Command Register (Device 0)
Address Offset:
Default Value:
Access:
Size:
CA–CBh
0000h
RO, R/W
16 bits
This register controls the GMCH responses to various system errors. Since the GMCH does not
have a SERR# signal, SERR messages are passed from the GMCH to the ICH5 over HI. When a
bit in this register is set, a SERR message will be generated on HI when the corresponding flag is
set in the ERRSTS register. The actual generation of the SERR message is globally enabled for
Device 0 via the PCI Command register.
Bit
Descriptions
15:10
Reserved
9
SERR on Non-DRAM Lock (LCKERR)—R/W.
0 =Disable
1 =Enable. The GMCH generates a HI SERR special cycle when a processor lock cycle is
detected that does not hit system memory.
8:7
Reserved
6
SERR on Target Abort on HI Exception (TAHLA)—R/W.
0 =Reporting of this condition is disabled.
1 =GMCH generates a SERR special cycle over HI when an GMCH originated HI cycle is
completed with a target abort completion packet or special cycle.
5
SERR on Detecting HI Unimplemented Special Cycle (HIAUSCERR)—R/W.
0 =GMCH does not generate a SERR message for this event. SERR messaging for Device 0 is
globally enabled in the PCICMD register.
1 =GMCH generates a SERR message over HI when an Unimplemented Special Cycle is
received on the HI.
4
SERR on AGP Access Outside of Graphics Aperture (OOGF)—R/W.
0 =Reporting of this condition is disabled.
1 =Enable. GMCH generates a SERR special cycle over HI when an AGP access occurs to an
address outside of the graphics aperture.
3
SERR on Invalid AGP Access (IAAF)—R/W.
0 =Invalid AGP Access condition is not reported.
1 =GMCH generates a SERR special cycle over HI when an AGP access occurs to an address
outside of the graphics aperture and either to the 640 KB – 1 MB range or above the top of
memory.
2
SERR on Invalid Translation Table Entry (ITTEF)—R/W.
0 =Reporting of this condition is disabled.
1 =GMCH generates a SERR special cycle over HI when an invalid translation table entry was
returned in response to an AGP access to the graphics aperture.
1
SERR on GMCH Detects Unsupported AGP Command—R/W.
0 =GMCH Detects Unsupported AGP command will
not
generate a SERR.
1 =GMCH generates a SERR when an unsupported AGP command is detected.
0
Reserved