PPC-E4+ User Manual.doc
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Rev 1.4 © 2015 EMAC, Inc.
2.11
Serial Flash
Also equipped is 4MB of SPI based bootable serial flash. To select this device the Boot1 jumper JB2 must be in
the B position and SPI0_CS0 must be active. JB3 can be used to Write Protect the serial flash when in the FWP
position. The serial flash can be used to Boot from or can be a handy place to store non-volatile configuration
data. See the software drivers for details on accessing this.
The Module can high-level boot from either the Serial Data Flash or the NAND Flash (selected through the low-
level bootloader). It is recommended to high-level boot from the Serial Data Flash, as this Flash is more reliable
than the NAND Flash. The NAND flash is ideal for the Operating System’s File System which can normally handle
marked bad blocks.
2.12
Status LEDs and Reset
The PPC-E4+ provides a status LEDs on the SoM-9G45 module, LD1 (Green) which is connected to processor
port pin PA7. Additionally, a Green power LED (LD1) and a SD Activity status LED (LD2) are provided on the
Carrier.
Also provided is a Reset Button (PB1). Pressing this button will cause the system to reset.
2.13
CAN Port
The PPC-E4+ is constructed from the SoM-9G45 module and the SoM-212 carrier. The SoM-212 carrier provides
for a un-isolated CAN port, however the SoM-9G45 does not provide a CAN controller so this functionality is not
available in the standard PPC-E4+ product. EMAC has other modules that do provide CAN should CAN be
required.
