UI ATLAS TileCal 1821 FASTBUS Crate Controller Page.
The LeCroy FASTBUS 1821 SM/I crate controller is basically a small computer that actually
controls the modules in the crate, collects the data, and interfaces with the main computer (In our case, the main computer is a 200MHz Pentium Pro).
The 1821 has two main parts: a sequencer and an interface.
basically the main CPU
operates at 33MHz (one instruction every 33 nsec)
has no operating system
runs something like assembly for all instructions (called SONIC code)
(4k x 32 data memory)
does pedestal subtraction from the data
8k x 10 pedestal memory
10 Mword / sec throughput
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