Peripherals¶

Selection jumpers¶

• Master Attached Flash Sharing location selection

  MAFS location can be set to be on module or on carrier, using (J14) jumper. During normal operation, it is set to module.

• Clear CMOS

  Using (J13) jumper, RTC on COM Express 7 can be cleared. During normal operation, it is set to powered, which provides power to the RTC.

Jumpers positions for normal operation are shown on the render bellow.

Fan control¶

• CPU fan (J11connector) is controlled by the COM Express 7 SoM.

• Case fans (J10 and J9 connectors) can either share PWM speed control with CPU fan or be individually controlled by ADT7476AARQZ (U24).

Board temperature measurement¶

Board temperature can be monitored with ADT7476AARQZ (U24) in three locations on the COM Express 7 Baseboard, using internal to the IC temperature sensor and two external sensors: (Q9) and (Q10). Their location is shown on the picture bellow.

SFI / KR¶

1 HS channel needs to be configured (e.g. CH A) for 10G-KR, configure the other HS channel for XFI per the attached instructions, and use Data Switch to connect CH A to CH B (DST_CONTROL_1/2 registers) (attached instructions).

By using OR resistors, SFI can be directly connected to 10GBase-KR pins on COM Express Type 7, eliminating the need for the TLK10232CTR ICs. This configuration is intended for modules that support SFI-compatible interfaces on 10GBase-KR pins, such as the SolidRun LX2160A.

10GbE on backplane connector¶

If LX2160A SoM is used, PCIe B3x4 on the backplane connector (J16) can be configured as 10G-KR.

GPIO Expanders¶

Two PCA9539AHF GPIO expanders are connected to the I2C bus 1 of the SoM:

• Expander at Address 0x74 (U41)

• Expander at Address 0x75 (U5)