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SPICE on entered schamatic(s)
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zaphodb777@gmail.com
electronics forum beginner


Joined: 18 Jan 2006
Posts: 14

PostPosted: Mon May 29, 2006 8:48 am    Post subject: Re: Bomarc schematic catalogs updated. 5/28/06 Reply with quote

Whoops, bad paragraph in that message, should have read...

Also, all our catalogs are available for free online. Of course, you
can still do
it THE OLD WAY, if you desire, but that takes 4 stamps.
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PeterSmith1954@googlemail
electronics forum addict


Joined: 04 Jul 2006
Posts: 79

PostPosted: Wed Jul 05, 2006 9:28 pm    Post subject: Re: PCI Clk Signal Track Reply with quote

PeterSmith1954@googlemail.com wrote:
Quote:
SioL wrote:
"Noway2" <no_spam_me2@hotmail.com> wrote in message news:1152107888.885047.199900@j8g2000cwa.googlegroups.com...

To accomplish this, many PCB tools will allow you to
add 'delay' to a line by putting in the "trombone" sections like appear
at the bottom of the picture you linked to. You may have also noticed
that these traces are rounded in the curves. This has the effect of
keeping the trace width constant to help control the characteristic
impedance of the line.


Does pcad have this function somewhere?

SioL

I have not used PCad in some years, but you will be looking for an
attribute that sets a specific length on a net (assuming this is an
addin card, the net will be point to point).

I suggest searching for that.

Note that if you are designing a PCI add-in card, *all* the signals
have required lengths. Get the spec and read it
(http://www.pcisig.org/)

If you think you haven't enough time, I am sure you will consider you
should have after the board doesn't work (highly likely if you don't
pay attention to the relative lengths).

As noted elsewhere, I particularly like the Cadence toolset as it can
import such rules directly from OrCad and other Cadence tools.

Cheers

PeteS

I have crossposted this to sci.electronics.cad as there are more likely
to be current PCAD users there.

You're looking for an attribute or constraint that requires a net to be
some specific length with a set tolerance (for the PCI CLK it's 2.5 +/-
0.1 inch according to my handy copy of the spec here)

Cheers

PeteS
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SioL
electronics forum Guru Wannabe


Joined: 03 May 2005
Posts: 162

PostPosted: Thu Jul 06, 2006 12:24 am    Post subject: Re: PCI Clk Signal Track Reply with quote

<PeterSmith1954@googlemail.com> wrote in message
Quote:
You're looking for an attribute or constraint that requires a net to be
some specific length with a set tolerance (for the PCI CLK it's 2.5 +/-
0.1 inch according to my handy copy of the spec here)

It sure is a pain in the butt to measure a zig-zagged line from a printout.

SioL
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Brad Velander
electronics forum Guru Wannabe


Joined: 10 May 2005
Posts: 118

PostPosted: Thu Jul 06, 2006 5:02 am    Post subject: Re: PCI Clk Signal Track Reply with quote

Can't measure it in the program? Most tools have some sort of function for
that, although some of them are certainly less than optimal. Some will give
you the details if your query the net in a certain manner or with a certain
tool/command.

--
Sincerely,
Brad Velander.

"SioL" <Sio_spam_L@same.net> wrote in message
news:w7Zqg.4161$oj5.1410300@news.siol.net...
Quote:
PeterSmith1954@googlemail.com> wrote in message

It sure is a pain in the butt to measure a zig-zagged line from a
printout.

SioL
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PeterSmith1954@googlemail
electronics forum addict


Joined: 04 Jul 2006
Posts: 79

PostPosted: Thu Jul 06, 2006 8:45 am    Post subject: Re: PCI Clk Signal Track Reply with quote

Brad Velander wrote:
Quote:
Can't measure it in the program? Most tools have some sort of function for
that, although some of them are certainly less than optimal. Some will give
you the details if your query the net in a certain manner or with a certain
tool/command.

--
Sincerely,
Brad Velander.

"SioL" <Sio_spam_L@same.net> wrote in message
news:w7Zqg.4161$oj5.1410300@news.siol.net...
PeterSmith1954@googlemail.com> wrote in message

It sure is a pain in the butt to measure a zig-zagged line from a
printout.

SioL

It's even better if the tool will permit you to set the constraint and
DRC it if you are outside the constraint (total track length in this
case). I do not know if PCad has that functionality.

Cheers

PeteS
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Noway2
electronics forum Guru Wannabe


Joined: 20 Sep 2005
Posts: 133

PostPosted: Thu Jul 06, 2006 12:33 pm    Post subject: Re: PCI Clk Signal Track Reply with quote

PeterSmith1954@googlemail.com wrote:
Quote:
Brad Velander wrote:
Can't measure it in the program? Most tools have some sort of function for
that, although some of them are certainly less than optimal. Some will give
you the details if your query the net in a certain manner or with a certain
tool/command.

--
Sincerely,
Brad Velander.

"SioL" <Sio_spam_L@same.net> wrote in message
news:w7Zqg.4161$oj5.1410300@news.siol.net...
PeterSmith1954@googlemail.com> wrote in message

It sure is a pain in the butt to measure a zig-zagged line from a
printout.

SioL

It's even better if the tool will permit you to set the constraint and
DRC it if you are outside the constraint (total track length in this
case). I do not know if PCad has that functionality.

Cheers

PeteS

PCAD will allow you to measure the trace length, and it is pretty easy
to do in the PCB tool. You can also set a design constraint on the net
and a DRC will tell you if you are within spec.

The feature that I saw in the Cadence tool that I liked is that it will
automatically generate the Trombones (or bevels or squares depending on
your preference) for you automatically to generate a given trace
length. It also shows you the trace length as you route it and changes
colors according to whether or not you are within tollerance of the
length.
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SioL
electronics forum Guru Wannabe


Joined: 03 May 2005
Posts: 162

PostPosted: Thu Jul 06, 2006 2:55 pm    Post subject: Re: PCI Clk Signal Track Reply with quote

"Noway2" <no_spam_me2@hotmail.com> wrote in message news:1152189211.817561.81890@m79g2000cwm.googlegroups.com...
Quote:
PCAD will allow you to measure the trace length, and it is pretty easy
to do in the PCB tool. You can also set a design constraint on the net
and a DRC will tell you if you are within spec.

I'll give it a try, thanks.

SioL
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Brad Velander
electronics forum Guru Wannabe


Joined: 10 May 2005
Posts: 118

PostPosted: Fri Jul 07, 2006 3:12 am    Post subject: Re: PCI Clk Signal Track Reply with quote

SioL,
I figured that it should but I haven't used PCAD since approx. 1991,
back in the good ole DOS days. These days I am using P99SE and they have a
tool that works very well for these types of measures but it is hidden in
the software and you have to do your own customizations to access the
feature, sort of an undocumented semi-hidden feature.

--
Sincerely,
Brad Velander.

"SioL" <Sio_spam_L@same.net> wrote in message
news:Ky9rg.4179$oj5.1414974@news.siol.net...
Quote:
"Noway2" <no_spam_me2@hotmail.com> wrote in message
news:1152189211.817561.81890@m79g2000cwm.googlegroups.com...
PCAD will allow you to measure the trace length, and it is pretty easy
to do in the PCB tool. You can also set a design constraint on the net
and a DRC will tell you if you are within spec.

I'll give it a try, thanks.

SioL
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JeffM
electronics forum Guru


Joined: 02 May 2005
Posts: 1007

PostPosted: Mon Jul 17, 2006 2:31 am    Post subject: abuse@newsfeeds.com Reply with quote

was: Cell Phone Information Site

Chris wrote:
>[SPAM[
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