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PS (Port Action Starts)
NR (NOR Tendered)
OS (Operation Starts)
OE (Operation Ends)
If there is not a matching OS to OE an error will occur - "ERROR - Port has more OE activities than OS activities“
PE (Port Action Ends)
IS/IE pairs (Interruption Starts/Ends) and DS/DE pairs (Delay Starts/Ends) can be inserted between OS and OE pairs to log interrupts and delays.
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