Specification Sheet
MCHBAR Registers
226 Datasheet, Volume 2 of 2
7.61 PACKAGE—Offset 58A8h
Temperature margin in PECI temperature counts from the thermal profile specification.
Platform fan control SW is expected to read therm_margin value to control fan or
blower speed.
Access Method
Default: 7F00h
4
0h
RW
ENABLE_2X_REFRESH_INTERRUPT: When set, interrupts will be generated on a
rising transition of the hottest DIMM thermal status across whichever threshold 2x
refresh is configured for (WARM_THRESHOLD, HOT_THRESHOLD, or never, depending
on DDR_PTM_CTL.REFRESH_2X_MODE). This interrupt will never be triggered by
hardware in cases where 2X refresh is disabled OR when no thermal status updates
are being performed because CLTM, OLTM, and EXTTS are all disabled.
3
0h
RO
Reserved (RSVD): Reserved.
2
0h
RW
ENABLE_HOT_INTERRUPT: When set, interrupts will be generated on a rising
transition of the hottest DIMM thermal status from WARM to HOT (i.e. rise to or above
HOT_THRESHOLD). This interrupt will never get triggered by hardware in cases where
CLTM, OLTM, and EXTTS are all disabled.
1
0h
RO
Reserved (RSVD): Reserved.
0
0h
RW
ENABLE_WARM_INTERRUPT: When set, interrupts will be generated on a rising
transition of the hottest DIMM thermal status from COLD to WARM (i.e. rise to or
above WARM_THRESHOLD). This interrupt will never get triggered by hardware in
cases where CLTM, OLTM, and EXTTS are all disabled.
Bit
Range
Default &
Access
Field Name (ID): Description
Type: MEM
(Size: 32 bits)
Offset: [B:0, D:0, F:0] + 58A8h
3
1
2
8
2
4
2
0
1
6
1
2
8
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
RSVD
THERM_MARGIN