Artesyn COMX-P4080-2G-ENP2 Installation and Use (August 2014) - Manual (Page 46)

Functional Description
COMX-P4080-2G-ENP2 Installation and Use (6806800P63B) 46
This module not only supports SD card but also Micro SD card in which there is no writeprotect
signal. The sixth bit of the switcher S2 is provided to define whether a SD card or Micro SD card
is embedded in the carrier board.
4.13 SPI Interface
COMX-P4080-2G-ENP2 provides a SPI bus with 3 chip-select signals. All SPI bus signals are
routed to COM Express connectors.
The following figure illustrates the distribution of SPI bus:
4.14 LAN
This module provides 1 GE port with LED controlling signals routing to the COM Express
connectors and the magnetic must be placed on carrier board. The interface used between
MAC and PHY BCM5482 is the RGMII bus in P4080, which is multiplexed with USB1 ULPI bus, so
RCW [EC1] should be set to 00 as RGMII protocol.
U-boot should provide the driver of dTSEC and TCP/IP protocol stack. The U-boot can use TFTP
to download images to memory.
Table 4-7 SD or Micro SD card on the Carrier
S2.6 Card on the carrier
ON SD card
OFF (Default) Micro SD card
Figure 4-7 Distribution of SPI Bus