IPC-D-356 ulp, blind and buried vias

I've just discovered that the IPC-D-356 ulp does not handle blind or buried vias correctly. Actually, it lists them all as thru vias (Record type 317). This causes manufacturing houses to generate literally hundreds of errors on otherwise perfectly good HDI designs.

This ulp appears to work for boards with all thru-vias, but any blind or buried vias cause it to fail because it does not list them as Record type 307.

The big problem with this is that if there actually is a real error, it will be lost in the hundreds of "non-error" errors generated.

Having a Record type 390, for fudicials and such, would also be handy.

Is there any chance that an update to this ulp can be provided to reflect current technology?

Thanks,

Don

0 Richard_H over 12 years ago

Hi Don,

I will forward this to our ULP guru. I think the ULP was created long time ago when blind and buried vias haven't been supported yet. We will check this.
Thank you for your info.

Regards,
Richard
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Richard_H over 12 years ago in reply to Richard_H

Hi Don,

meanwhile I got an reply from our ULP guy. The ULP was written by one of our users and we do not have a documentation about the IPC data format. It would be wise to contact this guy directly. I'm currently travelling and could try to contact him beginning of next week. If you prefer, please try to contact him earlier. Maybe he reworks his ULP.

Regards,
Richard
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 DonQ over 12 years ago in reply to Richard_H

Looking a little deeper...

I see that the ulp has segments that generate "TypeNumber = 317" and "TypeNumber = 327", each with about 20 lines of code in a ulp with only about 135 total lines. The format for 'TypeNumber = 307' would be somewhat different, but someone who knew what they were doing could probably do this fairly easily. As it stands, this ulp is only a partial implementation of IPC-356.

I'm on the steep part of about 45 other learning curves right now, but maybe if you suggest that this ulp should be expanded to match the advertising, or the inclusion of this ulp in the advertising should make it clear that it only supports 2 layer boards (where it is hardly needed), maybe someone could be pursuaded.

Besides the original resource:

www.downstreamtech.com/cam-advisories/IPCD356_Simplified.pdf

I found this:

www.solidigm.com/downloads/ipc356a.pdf

has more info, even though it is about the "a" version. Even the "a" version had blind and buried vias.

Thanks,
Don
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Richard_H over 12 years ago in reply to DonQ

Hi Don,

thank you for digging in deeper.... I will forward these pdf files.....

Regards,
Richard
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Former Member over 12 years ago in reply to Richard_H

Did this ever get resolved? This would be very helpful to have.

***************************************************************

I went ahead and roughed in 4-layer blind/buried via handling. Passes check on at least 1 board. Use at your own risk.

Attachments:
ipc-d-356-blind.ulp.zip
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Richard_H over 12 years ago in reply to Former Member

Hello,

as far as I know there are no changes for the original ULP. I sent your ULP to our ULP guy as a kind of incentive...

Richard
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 DonQ over 10 years ago in reply to Former Member

Here is what I would up using on my 12 layer board (1-4-2-4-1) with blind and buried vias. It should work on all combinations up to 16 layers. No guarantees. Didn't know where to go with the "Version" info, so I called it 2.0.2x

Attachments:
5460.ipc-d-356-blind.ulp.zip
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel