A problem occured when I ran tran analysis in pll test bench, it displayed
" ERROR(SPECTRE-16525) :Fatal error found in protected block during tran analysis
ERROR: Input period data in 'period.txt' is than 16 lines It is not enough for evaluate PSD"
can someone help me solve this error?
The Fatal error in a protected block means that there was some fatal error in some part of the netlist/models which has been encrypted. Now this may be in the PFD/CP model which is produced by the PLL noise aware flow, because that's protected - or it may be elsewhere in your design models.
The second error is a consequence of the first - not enough data was produced for it to compute the power spectral density plots.
I found one similar problem in our databases, but it was not clear what the solution was - the problem went away, but I couldn't find a record of how it was solved. Anyway, what I'd suggest you do is: