GE Mini COM Express 10, Hardware Reference Manual

Page: 30 / 82

4.5 Test and Debug
The mCOM10-L1500 module provides JTAG access for the compatible ICs on the
following:
• G-Series SoC
• FPGA
• I210 Ethernet controller
JTAG is used for multiple purposes (FPGA programming, board testing, and processor
debugging), and the devices reside on different power domains (standby/auxiliary for the
FPGA and I210 Ethernet controller, and primary for the SoC). Therefore, the chain is
segmented so that only the appropriate devices are included. A 23-pin flex-cable
receptacle is provided to access the board’s JTAG chain, and for controlling its
configuration, based on two select lines. With
Board_Sel# alone asserted, only the FPGA
and I210 are included in the chain, which facilitates programming of the FPGA. For
processor debug,
APU_Sel# alone is asserted, and the G-Series SoC will be the only
device in the chain.
APU_Sel#
Board_Sel#
G-Series
SoC
I210 FPGA
JTAG
Connector
JTAG Chain Connections
4.6 Fan Monitor
The CPU temperature is monitored and compared with a target temperature. A PID
controller sets the fan speed output on
FAN_PWMOUT accordingly. The appropriate fan
driver circuit must be implemented at the carrier. Target temperature and PID control
values may be configured during
UEFI setup .
4.7 LED Status Indicators
There is a single green status LED on the mCOM10-L1500 module. It will be off until
power is applied and code execution starts, will blink during UEFI initialization, and then
become solid when initialization is complete shortly before operating system restart.
30 GFK-2896 Mini COM Express Type 10 Module mCOM10-L1500
For public disclosure