Features
Example: The Intel Xeon Processor E7-8800/4800/2800 Product Families processor
supports a minimum operating Intel QPI link transfer rate of 4.8 GT/s. Therefore, offset
2Bh-2Ch has a value of 4800.
Offset:
2Ch-2Dh
Bit
Description
15:0
Minimum Intel QPI Transfer Rate
0000h-FFFFh: MHz
7.5.4.3
QPIVN: Intel QPI Version Number
The Intel QPI Version Number is provided as four 8-bit ASCII characters. Writes to this
register have no effect.
Example: The Intel Xeon Processor E7-8800/4800/2800 Product Families processor
supports Intel QPI Version Number 1.0. Therefore, offset 2Eh-31h has an ASCII value
of “01.0”, which is 30, 31, 2E, 30.
Offset:
2Eh-31h
Bit
Description
31:0
Intel QPI Version Number
00000000h-FFFFFFFFh: MHz
7.5.4.4
TXT: TXT
This location contains the TXT location, which is a two-bit field and is LSB aligned. A
value of 00b indicates TXT is not supported. A value of 01b indicates TXT is supported.
Writes to this register have no effect.
Example: A processor supporting TXT will have offset 32h set to 01h.
Offset:
32h
Bit
Description
7:2
RESERVED
000000b-111111b: Reserved
1:0
TXT
TXT support indicator
00b: Not supported
01b: Supported
10b-11b: Reserved
7.5.4.5
MAXSMI: Maximum Intel SMI Transfer Rate
Systems may need to read this offset to decide on compatible processors and Intel
7500 scalable memory buffer capabilities. The data provided is the transfer rate,
rounded to a whole number, and reflected in binary coded decimal. Writes to this
register have no effect.
160
Datasheet Volume 1 of 2
INTEL [ INTEL ]
