DI/OT crate monitoring
Monitoring information exposed by DI/OT crate to the fieldbus
Field | Size (Bytes) | Comments |
---|---|---|
Structure version | 1 | to let us expand it in the future |
Restart counter | 1 | |
Peripheral Boards presence flags | 1 | 1 bit per slot |
Peripheral Boards ID | 16 (8x2B) | 2B per board for rad-tol variant |
Temperatures (4) | 4 | One per PSU, system board, one ambient. reduce 2B representation in sysboard FW |
Voltages (2) | 4 (2x2B) | 12V and 5V, values from the 2 PSUs are filtered / averaged by the sysboard FW |
Currents (4) | 8 (4x2B) | Get values from both PSUs to monitor current sharing |
Fan speeds (3) | 3 | Optional fan tray. Reduce 2B representation in sysboard FW |
PSU status | 1 | PSU presence, status and model (RaToPUS or COTS) information, 4 bits per PSU |
RadMon information | ?? | |
Reserved | 2 | Reserved for future use |
------ | ------ | ------ |
Total bytes | 41 |
Peripheral Boards identification
- SERVMOD_N signal is used to enable Service Mode for a given Peripheral Board. When in Service Mode, Peripheral Board attaches I2C EEPROMS to shared I2C bus and selected backplane I/O lines to JTAG TAP (if the board features an FPGA).
Identification procedure:
- System Board reads SERVMOD_N state (low = board inserted in a given peripheral slot)
- System Board drives SERVMOD_N high to attach identification EEPROM/-s to the shared I2C bus
- System Board reads unique ID and additional information about Peripheral Board and RTM (if present)
- After the identification cycle is finished System Board releases SERVMOD_N for this slot.
JTAG
- Backplane P1 connector pins have dual IO/JTAG function (selectable with SERVMOD_N):
- A3 - TDI
- D3 - TDO
- B4 - TMS
- H4 - TCK
- K4 - nTRST