Smart embedded management agent (sema) – ADLINK cExpress-BT User Manual
Page 38
Page 38
cExpress-BT
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 (Type-II). 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
• 128 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 the SEMA Technical Manual and SEMA Software Manual,
downloadable at:
Note: Due to limitations of the Intel "Bay Trail" platform, SEMA can only obtain CPU temperature readings when the OS is running.