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Smart Embedded Management Agent (SEMA) 39
5. Smart Embedded Management Agent (SEMA)
The onboard microcontroller (BMC) implements power sequencing and Smart Embedded Management Agent
(SEMA) functionality. The microcontroller communicates via the System Management Bus with the CPU/chipset.
The following functions are implemented:
‧ Total operating hours counter. Counts the number of hours the module has been run in minutes.
‧ On-time minutes counter. Counts the seconds since last system start.
‧ Temperature monitoring of CPU and board temperature. Minimum and maximum temperature values of
CPU and board are stored in flash.
‧ Power cycles counter
‧ Boot counter. Counts the number of boot attempts.
‧ Watchdog Timer. Set/Reset/Disable Watchdog Timer. Features auto-reload at power-up.
‧ System Restart Cause. Power loss/BIOS Fail/Watchdog/Internal Reset/External Reset
‧ Fail-safe BIOS support. In case of a boot failure, hardware signals tells external logic to boot from fail-
safe BIOS.
‧ Flash area. 1kB Flash area for customer data
‧ 2K Bytes Protected Flash area. Keys, IDs, etc. can be stored in a write- and clear-protectable region.
‧ Board Identify. Vendor/Board/Serial number/Production Date
‧ Main-current & voltage. Monitors drawn current and main voltages
For a detailed description of SEMA features and functionality, please refer to SEMA Technical Manual and SEMA
Software Manual, downloadable at:
http://www.adlinktech.com/sema/.
Note: Due to limitations of the Intel “Apollo Lake” platform, SEMA can only obtain CPU temperature readings when
the OS is running.
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