CAEN V262 I/O register.

Author:

Jason Venema, Ron Fox

Introduction to the CAEN V262

The CCaenIO class implements support for the CAEN V262 I/O register. This register is normally used as a trigger modules for the NSCL Data acquisition system readout skeletons. In that role, you don't need to include, or reference this module in any way in the experimental code. It is assumed to be installed in crate 0 with a base address of 0x444400, and support is built in to the framework libraries.

It is also possible to use this module as a general purpose I/O register as long as you keep in mind the fact that the input bits are not latched. You must therefore arrange some protocol to maintain the desired input state until input bits are read. The trigger system uses one of the SHP Out bits as a trigger acknowledge to perform exactly this function.

The sequence of use is typically to

• Construct a CCaenIO object
• Invoke methods like CCaenIO::ReadInput or CCaenIO::ReadInputs to access the input register.
• Invoke CCaenIO::PulseOutput to pulse SHP out outputs.
• Invoke CCaenIO::SetLevel to set output levels true
• Invoke CCaenIO::ClearLevel, or CCaenIO::ClearAll to clear output levels.
• Invoke CCaenIO::SetECL and CCaenIO::ClearEcl to set and clear ECL output values.

For VME controllers that support memory mapping, it is possible to short-cut some of the overhead of using this controller independent class by getting pointers directly to the module registers:

• CCaenIO::getInputPointer gets a pointer to the input register.
• CCaenIO::getPulsedOutputRegister gets a pointer to the SHP output register.
• CCaenIO::getLatchedOutputPointer gets a pointer to the OUT output register.
• CCaenIO::getECLOutputPointer gets a pointer to the ECL output register.

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