Intel BX80619I73820 User Manual

Thermal/Mechanical Specifications and Design Guide 79
PECI Interface
7.1.4.9 RdIAMSR()
The RdIAMSR() PECI command provides read access to Model Specific Registers
(MSRs) defined in the processor’s Intel Architecture (IA). Refer to Tab l e 7 -1 2 for the
exact listing of Intel
®
Core™ i7-3960X, i7-3970X processor Extreme Edition, Intel
®
Core™ i7-3930K processor, and Intel
®
Core™ i7-3820 processor registers accessible
through this command.
7.1.4.9.1 Command Format
The RdIAMSR() format is as follows:
Write Length: 0x05
Read Length: 0x02 (byte), 0x03 (word), 0x05 (dword), 0x09 (qword)
Command: 0xb1
Description: Returns the data maintained in the processor IA MSR space as specified
by the ‘Processor ID’ and ‘MSR Address’ fields. The Read Length dictates the desired
data return size. This command supports byte, word, dword and qword responses. All
command responses are prepended with a completion code that contains additional
pass/fail status information. Refer to Section 7.1.7.2 for details regarding completion
codes.
7.1.4.9.2 Processor ID Enumeration
The ‘Processor ID’ field that is used to address the IA MSR space refers to a specific
logical processor within the processor. The ‘Processor ID’ always refers to the same
physical location in the processor silicon regardless of configuration as shown in the
example in Figure 7-37. For example, if certain logical processors are disabled by BIOS,
the processor ID mapping will not change. The total number of Processor IDs on a
processor is product-specific.
‘Processor ID’ enumeration involves discovering the logical processors enabled within
the processor package. This can be accomplished by reading the ‘Max Thread ID’ value
through the RdPkgConfig() command (Index 0, Parameter 3) described in
Section 7.1.2.7.1 and subsequently querying each of the supported processor threads.
Unavailable processor threads will return a completion code of 0x90.
Alternatively, this information may be obtained from the RESOLVED_CORES_MASK
register readable through the RdPCIConfigLocal() PECI command described in
Section 7.1.4.11 or other means. Bits [7:0] and [9:8] of this register contain the ‘Core
Mask’ and ‘Thread Mask’ information respectively. The ‘Thread Mask’ applies to all the
enabled cores within the processor package as indicated by the ‘Core Mask’. For the
Intel
®
Core™ i7-3960X, i7-3970X processor Extreme Edition, Intel
®
Core™ i7-3930K
processor, and Intel
®
Core™ i7-3820 processor PECI clients, the ‘Processor ID’ may
take on values in the range 0 through 11.

Intel BX80619I73820 Specifications

General

Brand	Intel
Model	BX80619I73820
Category	Computer Hardware
Language	English