Intel 925 - Pentium D 925 3.0GHz 800MHz 4MB-Cache Socket 775 CPU User Manual

Host Bridge/DRAM Controller Registers (D0:F0)
R
72 Intel
®
82925X/82925XE MCH Datasheet
4.1.30 ESMRAMC—Extended System Management RAM Control
(D0:F0)
PCI Device: 0
Address Offset: 9Eh
Default Value: 00h
Access: R/W/L, RO
Size: 8 bits
The Extended SMRAM register controls the configuration of Extended SMRAM space. The
Extended SMRAM (E_SMRAM) memory provides a write-back cacheable SMRAM memory
space that is above 1 MB.
Bit Access &
Default
Description
7 R/W/L
0b
Enable High SMRAM (H_SMRAME): This bit controls the SMM memory space
location (i.e., above 1 MB or below 1 MB) When G_SMRAME is 1 and
H_SMRAME is 1, the high SMRAM memory space is enabled. SMRAM accesses
within the range 0FEDA0000h to 0FEDBFFFFh are remapped to DRAM
addresses within the range 000A0000h to 000BFFFFh. Once D_LCK has been
set, this bit becomes read only.
6 R/W/C
0b
Invalid SMRAM Access (E_SMERR): This bit is set when the processor has
accessed the defined memory ranges in Extended SMRAM (High Memory and T-
segment) while not in SMM space and with the D-OPEN bit = 0. It is software’s
responsibility to clear this bit. The software must write a 1 to this bit to clear it.
5 RO
1b
SMRAM Cacheable (SM_CACHE): This bit is forced to 1 by the MCH .
4 RO
1b
L1 Cache Enable for SMRAM (SM_L1): This bit is forced to 1 by the MCH.
3 RO
1b
L2 Cache Enable for SMRAM (SM_L2): This bit is forced to 1 by the MCH.
2:1 Reserved
0 R/W/L
0b
TSEG Enable (T_EN): This bit Enables SMRAM memory for Extended SMRAM
space only. When G_SMRAME =1 and TSEG_EN = 1, the TSEG is enabled to
appear in the appropriate physical address space. Note that once D_LCK is set,
this bit becomes read only.
4.1.31 ERRSTS—Error Status (D0:F0)
PCI Device: 0
Address Offset: C8h
Default Value: 0000h
Access: R/WC/S, RO
Size: 16 bits
This register is used to report various error conditions via the SERR DMI messaging mechanism.
An SERR DMI message is generated on a zero to one transition of any of these flags (if enabled
by the ERRCMD and PCICMD registers). These bits are set regardless of whether or not the
SERR is enabled and generated. After the error processing is complete, the error logging
mechanism can be unlocked by clearing the appropriate status bit by software writing a 1 to it.

Intel 925 - Pentium D 925 3.0GHz 800MHz 4MB-Cache Socket 775 CPU Specifications

General

Brand	Intel
Model	925 - Pentium D 925 3.0GHz 800MHz 4MB-Cache Socket 775 CPU
Category	Computer Hardware
Language	English