What is the VIA BLOCKAGE layer ?

[montu.gaurav]

Hi,

Can anybody please tell me waht is viablockage layer. I encountered a section of a tf file that I am using as:

DesignRule {
layer1 = "via1Blockage"
layer2 = "VIA1"
minSpacing = 0.22
}


The foundry document specifies no spacing about via blockage and I am confused what is it and how is it used by ASTRO.

Regards,
Gaurav Kaushik

 

[chyau]

Re: VIA BLOCKAGE layer

Dear Sir,

If you define viaBlockage layer, the Astro will not be routing above it.
The viaBlockage is the same metalBlockage.

Best Regards,
chyau

 

[montu.gaurav]

Re: VIA BLOCKAGE layer

Hi ,

That I understand.

What I didn't understand is why spacing is required between VIA1 and Via1blockage layer. The normal via spacing in the particular technology is 0.15. That spacing and the way how it is calculated is bothering me.

Please let me know if u have any idea.

Gaurav