Intel 460GX manual 117

Data Integrity and Error Handling

Table 6-1. Error Cases (Cont’d)

Error	Chip	System	Status		Log	Qualifier
	Detecting	Action	Register		Register
GART Parity Error	GXB	Continue, use address	FERR_GART	Nothing		GARTER
		as read from GART,				R_BINITE
		Unconditional XINTR#,
		Conditional XBINIT#.
		(NOTE: if XBINIT# is
		driven, then it is not
		required to drive
		XINTR#)
Illegal SMM	GXB	Unconditional XBINIT#	FERR_GART	Nothing
Access
Illegal Address	GXB	Unconditional XBINIT#	FERR_GART	Nothing
Illegal OB GART	GXB	Unconditional XINTR#,	FERR_PCI	Nothing		GARTER
Access		Conditional XBINIT#,				R_BINITE
		results undefined.
PXB Errors
Detected at
Expander Port
Expander Par-err	PXB	Set Status. If outbound	PCISTS [SSE],	Nothing		MODES
on any Header		error handling is enabled	ERRSTS[2]			[3]
		then assert BINIT#, else
		then SERR#, drop
		request (no cmplt
		returned).
Expander Par-err	PXB	Set Status. If outbound	PCISTS [SSE],	Nothing		MODES
on Write Data from		error handling in enabled	ERRSTS[2]			[3]
Expander		then poison data as
		passed to PCI, else then
		SERR# and write out
		data as good to PCI.
Expander HF Read	PXB	PXB: Set Status. Target	PCISTS [STA]	Nothing
Cmplt. from SAC		abort read to card.
		(Received in peer-to-
		peer)
Expander Par-err	PXB	Set Status. If outbound	ERRSTS[2],	Nothing		MODES
on IB Read Data		error handling is enabled	PCISTS[SSE]			[3]
		then poison data as
		passed to PCI, else then
		SERR# and pass read
		data as good to PCI.
Detected as PCI Master
PCI Par-err on OB	PXB	Set Status. Drive	ERRSTS[5], PCISTS[PE],	Nothing
Read Data		PERR#. Pass data with	PCISTS[DPE]
Received from		good parity to Expander.
Card		(PERR# is optionally
		elevated to SERR#)
Master Abort on	PXB	Return all 1’s	PCISTS [RMA]	Nothing
Read Done by PXB
Master Abort on	PXB	Drop data, normal CMP	PCISTS [RMA]	Nothing
Write Done by PXB
Target Abort	PXB	Return HF to either read	PCISTS [RTA]	Nothing
received by xXB		or write. If failed access
		is in middle of
		transaction then the
		remainder of the
		transaction is discarded.
PERR# Asserted	card	Optionally turned to	ERRSTS[6],	Nothing
by Card		SERR# by PXB.	PCISTS[DPE]

Intel® 460GX Chipset Software Developer’s Manual 6-19