Vol. 3C 35-83
MODEL-SPECIFIC REGISTERS (MSRS)
35.4.2 MSRs In Intel Atom Processors Based on Airmont Microarchitecture
Intel Atom processor X7-Z8000 and X5-Z8000 series are based on the Airmont microarchitecture. These proces-
sors support MSRs listed in Table 35-6, Table 35-7, Table 35-8, and Table 35-11. These processors have a CPUID
signature with DisplayFamily_DisplayModel including 06_4CH; see Table 35-1.
39:32
Package
Maximum Ratio Limit for 5C
Maximum turbo ratio limit of 5 core active.
47:40
Package
Maximum Ratio Limit for 6C
Maximum turbo ratio limit of 6 core active.
55:48
Package
Maximum Ratio Limit for 7C
Maximum turbo ratio limit of 7 core active.
63:56
Package
Maximum Ratio Limit for 8C
Maximum turbo ratio limit of 8 core active.
606H
1542
MSR_RAPL_POWER_UNIT
Package
Unit Multipliers used in RAPL Interfaces (R/O)
See Section 14.9.1, “RAPL Interfaces.”
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)
See Section 14.9.3, “Package RAPL Domain.”
66EH
1646
MSR_PKG_POWER_INFO
Package
PKG RAPL Parameter (R/0)
14:0
Thermal Spec Power. (R/0)
The unsigned integer value is the equivalent of thermal
specification power of the package domain. The unit of this field is
specified by the “Power Units” field of MSR_RAPL_POWER_UNIT
63:15
Reserved
Table 35-10. Specific MSRs Supported by Intel® Atom™ Processor C2000 Series (Contd.)with CPUID Signature
Register
Address
Register Name
Scope
Bit Description
Hex
Dec