Vol. 3C 35-81

MODEL-SPECIFIC REGISTERS (MSRS)

Table 35-9 lists model-specific registers (MSRs) that are specific to Intel

®

 Atom™ processor E3000 Series (CPUID 

signature with DisplayFamily_DisplayModel of 06_37H).

3:0

Power Units. 
Power related information (in milliWatts) is based on the multiplier,   

2^PU; where PU is an unsigned integer represented by bits 3:0. 

Default value is 0101b, indicating power unit is in 32 milliWatts 

increment.

7:4

Reserved

12:8

Energy Status Units. 
Energy related information (in microJoules) is based on the 

multiplier,   2^ESU; where ESU is an unsigned integer represented 

by bits 12:8. Default value is 00101b, indicating energy unit is in 

32 microJoules increment.

15:13

Reserved

19:16

Time Unit. 
The value is 0000b, indicating time unit is in one second.

63:20

Reserved

610H

1552

MSR_PKG_POWER_LIMIT

Package

PKG RAPL Power Limit Control (R/W) 

14:0

Package Power Limit #1. (R/W)
See Section 14.9.3, “Package RAPL Domain.” and 

MSR_RAPL_POWER_UNIT in Table 35-8. 

15

Enable Power Limit #1. (R/W)
See Section 14.9.3, “Package RAPL Domain.”

16

Package Clamping Limitation #1. (R/W)
See Section 14.9.3, “Package RAPL Domain.”

23:17

Time Window for Power Limit #1. (R/W)
in unit of second. If 0 is specified in bits [23:17], defaults to 1 

second window.

63:24

Reserved

611H

1553

MSR_PKG_ENERGY_STATUS Package

PKG Energy Status (R/O) 
See Section 14.9.3, “Package RAPL Domain.” and 

MSR_RAPL_POWER_UNIT in Table 35-8

639H

1593

MSR_PP0_ENERGY_STATU

S

Package

PP0 Energy Status (R/O) 
See Section 14.9.4, “PP0/PP1 RAPL Domains.” and 

MSR_RAPL_POWER_UNIT in Table 35-8

Table 35-8.  Specific MSRs Supported by Intel® Atom™ Processors with CPUID Signature 06_37H, 06_4AH, 06_5AH, 

06_5DH

Register 

Address

Register Name

Scope

Bit Description

 Hex

Dec