vmusb create name ?option value ...?
vmusb config name option value ?...?
vmusb cget name ?option?
This command provides the ability to read the two 32 bit counters (scalers) in the VMUSB module. This contributes the following two 32 bit words to the event:
The configuration options for he vmusb are:
-scalera input-spec Determines what increments scaler A. This can be one of dgga, nimi1, and nimi2 dgga at present is not useful, but is provided in case, in the future, access to internal delay and gate generators is addeed.
-scalerb input-pecDetermines what increments scaler B. This can be one of: carry, nimi1 or nimi2 the carry increments Scaler B when Scaler A overflows back to zero, effectively making the two 32 bit scalers a single 64 bit scaler with the Scaler B as the most significant bits. Note that the readout order, in this case, is that of a little endian 64 bit number.