Intel E7-8891 v2 CM8063601377422 User Manual

Product codes
CM8063601377422
Page of 504
Intel
®
 Xeon
® 
Processor E7-2800/4800/8800 v2 Product Family
47
Datasheet Volume Two: Functional Description, February 2014
IIO Functional Description
6.2
PECI and JTAG
6.2.1
PECI
PECI provides access to both DMI and PCIe CSRs. 
6.2.2
JTAG
6.2.2.1
JTAG Configuration Register Access
JTAG provides an access mechanism that allows a user to access any register in the IO 
module and PCH components connected to the processor via the DMI link. 
6.2.2.2
JTAG Initiated Southbound Configuration Cycles
The processor allows access to registers in other components in the system which are 
connected to the PCIe ports. 
6.3
PCI Express and DMI Interfaces
6.3.1
PCI Express
The IIO module supports 32 lanes of PCIe that can be configured as up to 8 
independent PCIe ports. All ports can operate as a standard PCI Express Root Port. 
6.3.2
Speed Support
The PCI Express speeds supported are 1.0 (2.5 GB/s), 2.0 (5 GB/s) and 3.0 (8 GB/s). 
These speeds are supported on all the 32 lanes. When the DMI port is operating as 
PCIe, it supports only 2.0 and 1.0 speeds.
6.3.3
PCI Express Link Characteristics - Bifurcation, Link 
Training, Downgrading and Lane Reversal Support
There is support for 32 PCI Express lanes and 4 DMI lanes. The DMI lanes can also be 
strapped to operate in PCIe mode. Each x16 PCI Express port can be bifurcated as 2 x8 
or 4 x4 or any combination there-of.
downloadlike
ArtboardArtboardArtboard
Report Bug