SMART Embedded Computing MC1600, Installation And Use Manual

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System Overview
MC1600 Extreme Edge Server Installation and Use (6806870A02B) 57
1.7.2 Ethernet Interface
Each CPU has one 10Gb Ethernet interface to the Ethernet switch. The CPUs also have
one 10Gb Ethernet interface directly between them. In addition, CPU1 has one 1Gb
Ethernet interface to a front panel RJ-45 connector. There is a second front panel RJ-45
port that can come from CPU1 or CPU2 as a build option. These are described in more
detail below.
1.7.2.1 Gigabit Ethernet Controller
The integrated Gigabit Ethernet controller is not used on CPU1 or CPU2.
1.7.2.2 PCIe-Based Gigabit Ethernet
One Ethernet MAC/PHY is connected to CPU1 via PCIe and provides a front panel
10/100/1000Base-T port, denoted ETH1 on the front panel. The second Ethernet
MAC/PHY is connected to CPU1 or CPU2 via PCIe and also goes to a front panel
10/100/1000Base-T port, denoted ETH2 on the front panel. By default, this port comes from
CPU2 on dual-CPU variants and from CPU1 on single-CPU variants.
1.7.2.3 10 Gigabit Ethernet Controller
Broadwell-DE contains a dual port 10Gb Ethernet controller with two independent 10Gb
Ethernet MACs each having PHY device interfaces for KX4 or KR mode. The controller
supports 10Gb, 2.5Gb and 1Gb operations on its network data interface.
 Port 0 of the integrated 10Gb Ethernet controller is connected to the Ethernet
switch. It uses the integrated KR PHY and is configured for 10GBASE-KR mode
(10Gbps, 1 lane).
 Port 1 of the integrated 10Gb Ethernet controller is connected between the
Broadwell-DE processors. It uses the integrated KR PHY and is configured for
10GBASE-KR mode (10Gbps, 1 lane).
A single external SPI flash for Ethernet configuration is connected to each CPU.
1.7.3 SPI Interface
The Broadwell-DE processor includes a Serial Peripheral Interface (SPI) consisting of clock
(CLK), master data out (MOSI), master data in (MISO) and an active low chip select
(CS_L).
Broadwell-DE supports up to two SPI flash devices using two separate chip select pins. The
SPI device is 16MB and operates at 50MHz. A SPI flash device with a valid descriptor must
be attached to chip select 0 as the BIOS boot device.