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Intel
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82854 Graphics Memory Controller Hub (GMCH)
66 D15343-003
4.8.20 ERRSTS – Error Status Register (Device #0)
This register is used to report various error conditions via Hub Interface Special cycles. An SERR,
SMI, or SCI Error Hub Interface Special cycle may be generated on a zero to one transition of any
of these flags when enabled in the PCICMD/ERRCMD, SMICMD, or SCICMD registers
respectively.
Address Offset:
Default Value:
Access:
Size:
62-63h
0000h
Read/Write Clear
16 bits
Bit Description
15:14 Reserved
13 FSB Strobe Glitch Detected (FSBAGL): When this bit is set to 1 the GMCH has detected a glitch
on one of the FSB strobes. Writing a 1 to it clears this bit.
12 GMCH Software Generated Event for SMI:
1: This indicates the source of the SMI was a Device #2 Software Event.
0: Software must Write a 1 to clear this bit.
11 GMCH Thermal Sensor Event for SMI/SCI/SERR:
1: Indicates that a GMCH Thermal Sensor trip has occurred and an SMI, SCI or SERR has been
generated. Note that the status bit is set only if a message is sent based on Thermal event
enables in Error Command, SMI Command and SCI Command registers. Note that a Trip Point
can generate one of SMI, SCI or SERR interrupts (two or more per event is illegal). Multiple Trip
Points can generate the same interrupt. If software chooses this mode, then subsequent Trips
may be lost.
0: Software must Write a 1 to clear this status bit. If this bit is set, then an interrupt message will not
be sent on a new Thermal Sensor event.
10 Reserved
9 LOCK to non-DDR SDRAM Memory Flag (LCKF)—R/WC:
1: Indicates that a CPU initiated LOCK cycle targeting non-DDR SDRAM Memory Space occurred.
0: Software must Write a 1 to clear this status bit
8 Received Refresh Timeout—R/WC:
1: This bit is set when 1024 memory core refresh are Queued up.
0: Software must Write a 1 to clear this status bit.
7 DRAM Throttle Flag (DTF)—R/WC:
1: Indicates that the DDR SDRAM Throttling condition occurred.
0: Software must Write a 1 to clear this status bit.
6 Reserved
5 Received Unimplemented Special Cycle Hub Interface Completion Packet FLAG (UNSC)—
R/WC:
1: Indicates that the GMCH initiated a Hub interface request that was terminated with an
Unimplemented Special Cycle completion packet.
0: Software must Write a 1 to clear this status bit.
4:0 Reserved