ModSlaveSim help v3.04 - 5.5. Values
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The value of a register (e.g. $101) or the pre-definedvariable is the value immediately before the start of the cycle. At the start of a cycle, a snapshot of all register values is taken and saved, and the value of is also saved. It is this set of consistent saved values that is used during a cycle when a statement contains a reference to a register or .