The VFAT Production Test Platform for the TOTEM Experiment
- P . Aspella, V . Avatia, +8 authors II . VFAT
The CCU25 is the core component of a newly developed field bus intended for the slow control, monitoring and timing distribution for the CMS silicon tracker. As no commercial component could satisfy all requirements of radiation hardness, functionality and electrical properties, a new component has been developed. Its architecture has been inspired by commercial token-ring type topologies. Each CCU25 contains various types of peripheral controllers and has dual network input and output ports allowing the cabling of a redundant network. Inside the chip, critical circuitry is tripled and a majorityvoting scheme is used to cope with errors caused by single event radiation effects. The design was fabricated with a library in rad-tolerant 0.25 μm CMOS developed at CERN . It contains approximately 50 000 cells and has 196 I/O pads for a die-size of 6x6 mm. The detailed functionality is described and first prototype usage is reported.