Dennis,
What I meant to say is that Protel offers up to 32 signal layers,
therefore the fence would be located on the 30th signal layer. since this is
a conductive layer you can set design rules or clearance constraints for
your components. It would solve the silk screen pad violations, help in
design spacing for test points, and rules for rework or placement. When you
are done laying out the board turn that layer off and your fence is gone.
Thus avoiding generating gerber data for that layer. Sorry I should have
explained my self in more detail.
Ted
-----Original Message-----
From: Dennis Saputelli [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 24, 2001 12:01 PM
To: Protel EDA Forum
Subject: Re: [PEDA] a lib. for everyone
wow, what ambition!
can you pls explain:
> 2 There is a conductive fence on the lowest layer as to avoid part
placement
> conflicts
a little more?
lowest layer = bottom layer?
and how does conductive help?
Dennis Saputelli
Ted Tontis wrote:
>
> The standards are all ready set. I do not have control of them, this task
> was put into motion sometime ago. If you want to look at the standards you
> can at www.pcbstandards.com . again I have no control over the set
> standards.
> anyone who thinks this can not be done is sorry to say wrong. We as
> designers make libraries every day. If we where to stick to the standards,
> follow them as they have been written, and everyone puts some time in the
> project the end result will be one large library that everyone will be
able
> to uses. Just think of the amount of time you will save if you did not
have
> to make a library. How many of us have the same foot prints in different
> designers .ddb, or have no real standard in there company and your library
> is a free for all.
>
> Here is a list of standards.
>
> 1 All parts must be in metric.
> 2 There is a conductive fence on the lowest layer as to avoid part
placement
> conflicts
> 3 for through hole parts the center is located on pin 1
> 4 for SMT parts center is located in the center of the part
> 5 each part has an assembly drawing
> 6 parts naming i.e.. Small Outline Packages, 7.8mm Lead Span (Pitch
0.65mm)
> SOP78- Pin Qty
>
> There are more but you get the idea. The end result will benefit everyone
in
> the group, I am doing this in my free time and I wanted to make sure that
> people would be interested before I dig in and get my hands dirty. I am
> currently working on translating 8500 parts into this format. Look over
the
> standards and give me as much input weather it be positive or negative. I
am
> also working on getting a forum started or get on the existing one as the
> project extends it self.
>
> Ted
>
--
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