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steppreset in .scs file

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Hi,

I would like to define steppreset as a dynamic parameter in tran simulation. The sim file is

section XXX
pset_ctrl paramset{
time steppreset
0 mx
8u ax
}
endsection

The error info is

Error found by spectre during hierarchy flattening.
ERROR: Unknown parameter `mx' has been specified in expression `mx'
ERROR: Unknown parameter `ax' has been specified in expression `ax'

The referrence is: https://community.cadence.com/cadence_blogs_8/b/cic/posts/dynamically-changing-spectre-x-solver-settings 

My question is why mx and ax is not accepted?

BR


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