Taking a ride on the VME bus
The second talk Thursday morning was by Ron Fox about a small extension that allows experimental physicists (who aren't professional programmers) to control their experiments.
VME bus (VersaModule Eurocard)
- Defined by IEEE 1014-1987 and others
- Physical standard for cards
- Electrical standard for the bus
- Set of protocols for using the bus
Went through a series of slides explaining how the VME-BUS works (arbitration and read cycle).
Bus used in three systems at NSCL:
- Accelerator Control systems
- Experiment Control systems
- Data Taking
The extension is targeted primarily for the experiment control systems.
Extension provides not much:
- Create a slice of memory/map of address space for each of the common address modifiers (A16, A24, A32 and GEO)
- Ability to set/get long words, words or bytes in an arbitrary offset relative to the start of the address map
- Address map boundary protection
package require vme
vme create name -device amod base nbytes
name set {l|w|b} offset value
name get {l|w|b} offset
vme delete name
vme listAll ~500 lines of C++. Various pure Tcl packages built on top.
Showed GUIs that were developed using the package that control experiments.
—Michael A. Cleverly
Thursday, October 12, 2006 at 10:24
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Fri, 06 Nov 2020, 05:22