Datasheet
Processor Uncore Configuration Registers
484 Datasheet, Volume 2
4.4.2.18 TEMPERATURE_TARGET—Temperature Target Register
This Legacy register holds temperature related constants for platform use.
4.4.2.19 TURBO_POWER_LIMIT—Turbo Power Limit Register
TEMPERATURE_TARGET
Bus: 1 Device: 10 Function: 0 Offset: E4h
Bit Attr
Reset
Value
Description
31:28 RV 0h Reserved
27:24 RO-V 0h
TJ Max TCC Offset
Temperature offset in degrees (C) from the TJ Max. Used for throttling
temperature.
Will not impact temperature reading. If offset is allowed and set, the throttle will
occur and reported at lower than Tj_max
23:16 RO-V 00h
Thermal Monitor Reference Temperature
This field indicates the maximum junction temperature, also referred to as the
throttle temperature, TCC activation temperature or prochot temperature. This is
the temperature at which the Thermal Monitor is activated.
15:8 RO-V 00h
Fan Temperature target offset
Fan Temperature target offset (also known as T-Control).
This field indicates the relative offset from the Thermal Monitor Trip Temperature
at which fans should be engaged.
7:0 RV 0h Reserved
TURBO_POWER_LIMIT
Bus: 1 Device: 10 Function: 0 Offset: E8h
Bit Attr
Reset
Value
Description
63 RW-KL 0b
Package Power Limit Lock
When set, all settings in this register are locked and are treated as Read Only.
This bit will typically set by BIOS during boot time or resume from Sx.
62:56 RV 0h Reserved
55:49 RW-L 00h
Package Power Limit 2 Time Window
x = PKG_PWR_LIM_2_TIME[55:54]
y = PKG_PWR_LIM_2_TIME[53:49]
The timing interval window is Floating Point number given by 1.x * power(2,y).
The unit of measurement is defined in
PACKAGE_POWER_SKU_UNIT_MSR[TIME_UNIT].
The maximal time window is bounded by
PACKAGE_POWER_SKU_MSR[PKG_MAX_WIN].
The minimum time window is 1 unit of measurement (as defined above).
48 RW-L 0b
Package Clamping Limitation 2
Package Clamping limitation #2 - Allow going below P1.
0 = PBM is limited between P1 and P0.
1 = PBM can go below P1.
47 RW-L 0b
Package Power Limit 2 Enable
This bit enables/disables PKG_PWR_LIM_2.
0 = Package Power Limit 2 is Disabled
1 = Package Power Limit 2 is Enabled