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How to reduce the Scan Chain Length in Astro?

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Seravy

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astro scanchain

Dear all,

I am using Synopsis Astro to Place & Route my netlist (with scan chain).
Since my scan chain order should be remained for some optimization reasons,
I could not let Astro to change my scan chain order. However, the total wire
length will be awful.

I have tried "Trace Scan Chain" & "Optomize Scan Chain", but it seems futile...

Can anyone tell me a way to let Astro to optimize the scan chain wire length and
the total wire length?

Thanks!
 

scan chain length

What problem will a long length scan-chain arise?
 

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