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how to do a scan chain in Astro?

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Wang Chin

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Hi, All,

The document for scan chain in Astro seems very poor. Does somebody can tell me where to get related information for the flow or maybe you have a command file to porvide me to this issue!
Thanks!
 

Scan Chain

Scan Chain insertion is done in DFT compiler before Astro routing
 

Hi, cathay,

I see. I mean, if my netlist have a scan cell, how to do it in Astro?
In Astro's document, we can just find a few papaer in appendix B for this issue. But, after seeing the paper, I don't know how to do it. So, if you can help me, I will appreciate your help.
 

Wang Chin said:
Hi, All,

The document for scan chain in Astro seems very poor. Does somebody can tell me where to get related information for the flow or maybe you have a command file to porvide me to this issue!
Thanks!
Click to expand...
hello,can you tell me your Astro is for linux or for workstation
what's it's version?
thank you !
 

scan chain is already done in DFTC and generate a scan netlist for Astro,
In Astro just take care the scan clock path only.
 

My Astro is Unix and 2003.03!
 

johnnyh said:
scan chain is already done in DFTC and generate a scan netlist for Astro,
In Astro just take care the scan clock path only.
Click to expand...

Sir,

I see! The scan chain have done in DFTC. I think my question is how to take care the scan clock and path in Astro? Thanks!
 

hi,

Astro only perform reordering scan cell in scan chain flow
You can delete scan chain before placement and connect afer CTS.
Do you want to detail about how to run this flow ?

chyau
 
hi,

What you can do is, you let Astro know the scan chain path befoer the placement, and, astro will make note of it.

After CTS, you can ask Astro to reconnect them back and do a scan chain reordering.
 

chyau said:
hi,

Astro only perform reordering scan cell in scan chain flow
You can delete scan chain before placement and connect afer CTS.
Do you want to detail about how to run this flow ?

chyau
Click to expand...


Hi chyau

Please let us know the detail reordering flow if you possible.

thanks,
daffo
 

You can use the following order of Astro commands
Before placement:

axgScanTrace (to identify scan chain in the design)

aprDumpScanChain (to keep this infor for future inspection)

axgScanChainOptim
setFormField "Scan Chain Optimization" "Mode" "Delete only" (to delete the chain connectivity)

astAutoPlace (usual placement command or any other you want)

axgScanChainOptim
setFormField "Scan Chain Optimization" "Mode" "Optimize" (to connect scan flop in scan chain, according to real flop placement)
 

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