Artesyn COMX-P4080 Installation and Use (August 2014) - Manual (Page 67)

Functional Description
COMX-P4080 COM Express Module Installation and Use (6806800L20C) 67
4.13 Local Bus
There is one 128-MB NOR flash and one 1-GB NAND flash attached to the local bus. The NOR
flash is used for storage of the RCW data, U-Boot and Linux kernel. By default, the NAND flash
is used for storing the file system.
Four chip select signals, from CS0 to CS3, are included in the local bus. Of these, only CS0 is
enabled during power-on reset. The chip select signal of the device from which the system
boots should be connected to the local bus through CS0.
Local bus with 8 bits data bus, as well as the control signals, are routed to COM-E connectors.
Local bus signals are disabled by default, and can be enabled through the buffers using the 8th
bit of S1.
Table 4-9 Local Bus on COM-E
S1.8 Local Bus on COM-E
ON Enabled
OFF (default) Disabled
Figure 4-7 Local Bus Distribution