Intel C2518 FH8065501516710 Data Sheet
Product codes
FH8065501516710
Volume 2—SMBus 2.0 Unit 2 - PECI—C2000 Product Family
CPU Thermal and Power Optimization Capabilities
Intel
®
Atom™ Processor C2000 Product Family for Microserver
Datasheet, Vol. 2 of 3
September 2014
426
Order Number: 330061-002US
17.9.13
Package Power Limit Performance Status Read (Index = 8)
This service allows the PECI host to assess the performance impact of the currently
active power limiting modes. The read return data contains the total amount of time for
which the entire processor package has been operating in a power state that is lower
than what the operating system originally requested. This information is tracked by a
32-bit counter that wraps around. See
. The unit for time is
17.9.14
Wake-on-PECI Mode Bit Write/Read (Index = 5)
The wake on PECI bit allows for waking up the SoC if in a Package C-State. If it is not
set, PECI will not respond to queries when in Package C6. This has no effect in the
C2000 Product Family.
17.9.15
SoC Power Budget (Index = 40)
This service proves the overall Thermal Design Power (TDP) for the SoC. It also
provides the package consumed power.
Figure 17-25.Package Power Limit Performance Data
Accumulated CPU Throttle Time
0
31
Table 17-28. SoC Power Budget Data Format
Bits
Access
Type
Default
Value
Description
31
RO
1'h0
RESERVED_3
: Reserved.
30:16
RO
15'h0
SOC_POWER_STS:
Instantaneous SoC power consumption reported by
SoC. SoC may use this field to allocate energy credits to SoC and restrict CPU
Turbo. If this field is greater than SOC_TDP, package energy credit will be
depleted and CPU will not be allowed to Turbo. Power is represented in units
specified in PKG_POWER_SKU_UNIT [POWER_UNIT].
15
RO
1'h0
RESERVED_1
: Reserved.
14:0
RO
15'h0
SOC_TDP:
TDP budget for SoC and other SoC components.
Initialized by the SoC to SOC_TDP_FUSE. Used by Power Budget Manager
calculations to determine package energy credit. Value from SOC_TDP_FUSE
is scaled according to PKG_POWER_SKU_UNIT [POWER_UNIT].