How to describe in DFT compilto use external reference clock to pll as a scan clock?

chis4yu · Feb 2, 2021

Hi,

I have a pll which can bypass the pllout with input reference clock.
So when I force bypass=1, then the input reference clock is output to the pllout.

How to describe for DFT compiler this special connection and treat the reference clock as a scan clock ?

set_dft_signal -view existing_dft TestMode -port Xscanmode_i -active 1
set_dft_signal -view existing_dft ScanClock -port Xclkref_r_i

so the Xclkref_r_i is bypassed to the pllout when Xscanmode_i=1
should the scanclock actually be defined at the output of the pll due to this special mode ?

UPDATED SCANCLOCK DEFINITION
set_dft_signal -view existing_dft ScanClock -hookup_pin {i_pll/pllout}

Thanks,

David

How to describe in DFT compilto use external reference clock to pll as a scan clock?

chis4yu

Newbie level 4

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How to describe in DFT compilto use external reference clock to pll as a scan clock?

chis4yu

Newbie level 4

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