Nah... doesn't bug me... I'm sure it may make sense for the reasons that have been mentioned here, but on a 15 year old design with 50 thou pitch PLCCs on it... not so much. When it's written into the design rules document without any sort of reasons why one would do it, it has become a habit.
regards,
- Graham
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Cullum
Sent: Thursday, July 30, 2009 11:32 AM
To: [log in to unmask]
Subject: Re: [TN] Hashing-Out Hatching
Graham, you're probably going to start feeling that you are being dumped on (smile).
I regret to say that this is a practice we use here to better our chances of
passing emissions testing.
Craig Cullum, Engineering Technologist, AMTELCO
e: [log in to unmask]
[log in to unmask]
f: 608 838 8367
v: 608 838 4194, or 4197, x128
Please visit us at www.amtelco.com
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Kenneth Wood
> Sent: Thursday, July 30, 2009 9:03
> To: [log in to unmask]
> Subject: Re: [TN] Hashing-Out Hatching
>
> Actually that is the HDI method that is becoming more and more popular.
> Via-in-pad, internal routing and external GND planes.
> Ken
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
> Sent: Thursday, July 30, 2009 9:58 AM
> To: [log in to unmask]
> Subject: Re: [TN] Hashing-Out Hatching
>
> Ha... We had a designer at one time who thought that surface traces were
> bad, very bad. So every pad for every part had a short trace that
> immediately went to a via and the signal was routed to an inner layer.
> Seriously. That guy needs your doctor...
>
> regards,
> - Graham Collins
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of James Head
> Sent: Thursday, July 30, 2009 10:50 AM
> To: [log in to unmask]
> Subject: Re: [TN] Hashing-Out Hatching
>
> > Gary brought me back to the days when, just for kicks, I would take other
> > guy's designs and remove all of their vias, just to prove I could do it.
> I've
> > gotten help, I'm cured, a thousand vias is nothing anymore.
>
> You should pass me the details of your doctor - I always spend a little
> time
> at the end of a project going through and trying to eliminate vias if I can
> as I see everyone of them as a potential failure point - and it's very
> satisfying to re-run the drill report and see the hole count drop!
>
> Mind you I'm not obsessive though. I worked with one relatively
> inexperienced PCB designer once who spent a whole week designing a power
> and
> deflection PCB for a televison and managed to do it all without any vias or
> wire jumpers. Unfortunately his design would never have worked with
> segregation between the primary and secondary sides of the transformer and
> 0.3 mm traces carrying high voltages and currents!
>
> James
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