1. A first look @ SOP for Belle2
A. Aloisio, R. Giordano
Univ. of Naples ‘Federico II’
and INFN – Sez. di Napoli
A. Anastasio, G. Tortone
INFN – Sez. di Napoli
May. 10th, 2014

2. Service Oriented Platform (SOP)
Cortex A8 1GHz
Linux OS (Debian)
2 GB Flash
512 MB RAM
Designed as a possible general slow-control platform for Belle2
Designed for easy maintainability
3U Eurocard form factor
Derived from and compatible with BeagleBoneBlack open source project by Texas Instruments

3. Front Side 2x USB device 10/100 Ethernet microSD card Monitoring LEDs
Power Supply via USB (device) or 5V input
Board management via an IPMI*-like interface over 10/100 Ethernet
uP Reset
Power cycle
Loading of bootloader
OS flashing
uP UART0 console over Ethernet
LEDs
USB (device)
Ethernet
microSD
USB (host)
IPMI-like over Ethernet
*Intelligent Platform Management Interface

4. Rear Side Fully Isolated I/O: Non Isolated I/O: 2x I2C SPI RS232 JTAG
All IOs fail proof (?)
Non Isolated I/O:
Digital IO
On-chip ADCs
On chip ADC
JTAG
SPI
2x I2C
RS232

5. Project Status - Hardware
Design of first version completed
PCB manufacturing completed (10 layers)
#5 PCBs INFN Na
Assembly of 4 units in progress
Then tests, debug, troubleshooting, …

6. Project Status - Software
Linux distribution available and open-source (Debian)
Software for JTAG programming of Xilinx FPGA completed and tested successfully
Software for ADC read-out via I2C in progress
Software for IPMI-like features in progress
Hot tasks:
Integration in EPICS
Definition of high-level software architecture :
push vs. pull
publish/subscribe
synchronous vs. asynchronous
Network usage and role
web or stand-alone GUI

7. Sensors and more Slow controls deal with 3 types of sensors
Thermo-resistance
Humidity
Current probes
Slow acquisition rate (fraction of Hz)
High accuracy
In Belle-II it is presently done by means of HP multi-meter with analogue mux
SOP will/could be interfaced with custom Roma3 preamp, such to provide a low-performance but self-contained DAQ framework

8. Temperature Monitoring
In this revision, SOP does not include peripherals. Instead, it supports protocols for remote data acquisition via field busses (I2C, SPI, JTAG, …)
For temperature monitoring in Belle2, LTC2499 seems to be a perfect candidate:
24-bit, ΣΔ architecture
50/60 Hz line noise filter
7.5 Hz sampling Rate
Direct Sensor Digitizer
Direct Temperature Measurement
I2C interface
SOP can be directly interfaced with the DC1012A-A board available from Linear Technology for performance evaluation

9. Conclusion
SOP is a self-contained platform for the slow controls of the Belle-2 Forward Calorimeter…
… yet, it is general enough to be deployed in other sub-detectors. Specific features can be added if needed.
First prototypes available by the end June 2014
Basic software (both system & user oriented) presently under development
Deployment of FPGAs (Xilinx Artix ?) will be taken into account if needed