Datasheet

Datasheet 93
DRAM Controller Registers (D0:F0)
5.1.35 ERRCMD—Error Command
B/D/F/Type: 0/0/0/PCI
Address Offset: CA–CBh
Default Value: 0000h
Access: RW, RO
Size: 16 bits
This register controls the MCH responses to various system errors. Since the MCH does
not have an SERRB signal, SERR messages are passed from the MCH to the ICH over
DMI.
When a bit in this register is set, a SERR message will be generated on DMI whenever
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 Access
Default
Value
Description
15:12 RO 0h Reserved
11 RW 0b
SERR on MCH Thermal Sensor Event (TSESERR):
1 = The MCH generates a DMI SERR special cycle when bit [11] of the ERRSTS is
set. The SERR must not be enabled at the same time as the SMI for the
same thermal sensor event.
0 = Reporting of this condition via SERR messaging is disabled.
10 RO 0b Reserved
9RW0b
SERR on LOCK to non-DRAM Memory (LCKERR):
1 = The MCH will generate a DMI SERR special cycle whenever a processor lock
cycle is detected that does not hit DRAM.
0 = Reporting of this condition via SERR messaging is disabled.
8:2 RO 0s Reserved
1RW0b
SERR Multiple-Bit DRAM ECC Error (DMERR):
1 = The MCH generates an SERR message over DMI when it detects a multiple-
bit error reported by the DRAM controller.
0 = Reporting of this condition via SERR messaging is disabled.
For systems not supporting ECC this bit must be disabled.
0RW0b
SERR on Single-bit ECC Error (DSERR):
1 = The MCH generates an SERR special cycle over DMI when the DRAM
controller detects a single bit error.
0 = Reporting of this condition via SERR messaging is disabled.
For systems that do not support ECC this bit must be disabled.