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CSM executing time problem

Other Parts Discussed in Thread: TMS320F28335

Device Type: TMS320F28335

Here I run the same application code in two cases:

Case 1: Device 28335 is secured

Case 2: Device 28335 is unsecured

 

The executing time measured for the same application code are as below:

Case 1:  96[us]

Case 2:  61[us]

Why the executing time when device is secured is much longer? Does it need extra operation in this case?