Package Power Sku Data; Power Control Register Unit Calculations - Intel BX80619I73820 Design Manual

PECI Interface
Table 7-10. Power Control Register Unit Calculations
7.1.2.7.3 Package Power SKU Read
This read allows the PECI host to access the minimum, Thermal Design Power and
maximum power settings for the processor package SKU. It also returns the maximum
time interval or window over which the power can be sustained. If the power limiting
entity specifies a power value outside of the range specified through these settings,
power regulation cannot be guaranteed. Since this data is 64 bits wide, PECI facilitates
access to this register by allowing two requests to read the lower 32 bits and upper
32 bits separately as shown in
per the Package Power SKU Unit settings described in
Figure 7-25. Package Power SKU Data
63
Reserved
31 30
Reserved
7.1.2.7.4 "Wake on PECI" Mode bit Write / Read
Setting the "Wake on PECI" mode bit enables successful completion of the
WrPCIConfig()Local, RdPCIConfigLocal(), WrPCIConfig() and RdPCIConfig() PECI
commands by forcing a package 'pop-up' to the C2 state to service these commands if
the processor is in a low-power state. The exact power impact of such a 'pop-up' is
determined by the product SKU, the C-state from which the pop-up is initiated and the
negotiated PECI bit rate. A 'reset' or 'clear' of this bit or simply not setting the "Wake
on PECI" mode bit could result in a "timeout" response (completion code of 0x82) from
the processor indicating that the resources required to service the command are in a
low power state.
Alternatively, this mode bit can also be read to determine PECI behavior in package
states C3 or deeper.
7.1.2.7.5 Accumulated Run Time Read
This read returns the total time for which the processor has been executing with a
resolution of 10 nS per count. This is tracked by a 32-bit counter that rolls over on
reaching the maximum value. This counter activates and starts counting for the first
time at RESET_N de-assertion.
Thermal/Mechanical Specifications and Design Guide
Unit Field
Time
Energy
Power
Table
55 54 48
Maximum Time
Window
Package Power SKU (upper bits)
Minimum Package Power
Package Power SKU (lower bits)
Value Calculation
TIME UNIT
1s / 2
ENERGY UNIT
1J / 2
POWER UNIT
1W / 2
7-8. Power units for this read are determined as
Section
47 46
Reserved Maximum Package Power
16 15 14
Reserved TDP Package Power
Default Value
10
1s / 2 = 976 µs
16
1J / 2 = 15.3 µJ
3
1W / 2 = 1/8 W
7.1.2.7.2.
32
0
73