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6 Miscellaneous Features
6.1
Mini PCI Express/mSATA sharing
Fit-PC4 advanced platform components and Compulab’s flexible system design offers extremely
high utilization of different functionalities and mechanical Form Factors to be implemented on
the same HW.
Mini PCIe and mSATA share the same slot, and allow the flexibility to install both storage and PCI
express devices. PCI Express/SATA interface switching implemented with 4-channel differential
bi-directional multiplexer/de-multiplexer as shown in Figure 15.
Note: Proper functionality requires BIOS configuration to set the MUX to desired connectivity
option (mSATA by default).
Figure 15 – fit-PC4 PC Mini PCIe/mSATA scheme
NXP CBTU04083
4-diff CH 2:1 Mux/Demux
PCIE_GPP1
A-B
AMD SoC
GX-420CA/
A4-1250
A-B
A-C
HOST / FACE Module interface
PCIE
PCIE_GPP1_FM
A-C
PCI Express
Root Port
SEL
GPIO
SATA Host
Controller
SATA_PCIE_MUX_SEL
SATA1
USB3
SMBus
controller
SMBus
CompuLab Ltd.
Shared
Mini PCIe / mSATA
Full Size slot
PCIE_GPP1/SATA1
USB EHCI
Host
Controller
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fit-PC4 – Hardware Specification
mSATA card: NC
Mini PCIe card: GND
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