Interfaces and Connectors
EBX-18 Hardware Reference manual
28
Figure 12. Location of the mSATA Activity LED
B
OOTING FROM A
PCI
E
M
INICARD
The MSATA_DETECT (J19 pin 43) signal is non-functional as an option for the PCIe Minicard
mux selection. This signal has a pull-down internal to the FPGA to prevent it from floating high
(which enables it). The FPGA default is to use J19 pin 51 as the mux enable signal
(PRES_DISABLE2#) which works with all of our Minicards.
The result of this condition is that certain combinations of bootable devices may not yield
expected results. Table 14 is a matrix of acceptable boot device configurations.
Table 14: Primary Boot Device Truth Table
Installed Bootable Devices
The primary boot
device will be…
microSD card
mSATA card
External SATA Drive
USB Flash Drive
Yes
Don’t care
Don’t care
Don’t care
microSD card
No
Yes
Don’t care
Don’t care
mSATA card
No
No
Yes
Don’t care
External SATA drive
No
No
No
Yes
USB Flash Drive
Note:
If an mSATA device is attached, the BIOS Setup program will not recognize any device
attached to the J16 SATA connector.