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42 MC1600 Extreme Edge Server Installation and Use (6806870A02A)
System Overview
System Overview
1.7.1.1 PCI Express Gen3
The Integrated I/O (IIO) module of Broadwell-DE processor provides 24 lanes of PCIe Gen 3
interface [3], comprising 2 ports. The first port (PE1) is a x16 PCIe that can be bifurcated to two
x8, two x4 and one x8, or four x4 root ports each, and the second port (PE2) is a x8 PCIe that
can be bifurcated to two x4 root ports. Refer to the figure,
High Level Broadwell-DE Block
Diagram on page 39 .
All PCIe Gen3 interfaces can operate as a standard PCIe root port. The processor supports Gen1
(2.5Gb/s), Gen2 (5Gb/s) and Gen3 (8Gb/s) PCIe speeds. These speeds are supported on all the
lanes. Port bifurcation, degraded mode, lane reversal, and polarity inversion is supported for
all PCIe ports.
On the Extreme Edge Server, the x16 port (PE1) of each CPU is bifurcated into two x8 ports, of
which only the first one is used. Connections to the PCIe connector are according following
table.
On the Extreme Edge Server, the x8 port (PE2) of each CPU is bifurcated into two x4 ports.
These ports connect to the M.2 NVMe modules according to the following table.
Table 1-4 PCI Express Gen3 Interfaces to PCIe Connector
CPU
IIO
Port IIO Port
Lanes Bifurcated
Port Bifurcated
Port Lanes Destination
(PCIe Connector Signals)
CPU1 PE1 <7:0> 1 <7:0> PETp/PETn<7:0> and PERp/PERn <7:0>
CPU2 PE1 <7:0> 1 <7:0> PETp/PETn<15:8> and PERp/PERn <15:8>
Table 1-5 PCI Express Gen3 Interfaces to M.2 Modules
CPU IIO Port
IIO Port
Lanes Bifurcated
Port Bifurcated Port
Lanes
Destination
CPU1 PE2 <3:0> 1 <3:0> M.2 (Primary)
CPU1 PE2 <7:4> 2 <3:0> M.2 (Secondary)
CPU2 PE2 <3:0> 1 <3:0> M.2