delorie.com/archives/browse.cgi   search  
Mail Archives: geda-user/2016/10/23/22:27:09

X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=gmail.com; s=20120113;
h=mime-version:from:date:message-id:subject:to;
bh=q6Y+opi2vIgjmmILf7vySm89qm3HNt0gM400zxnexCQ=;
b=v899j/FjBngov5Zf3qvPuvkiSmyGagx+quWKECncV/hfYBATde38g3hjBOUI+RCahm
L2WuZdaU5CNmp2Jp5njZdn5JQJoDdy3SG4kXmiZmdgWv80uYNE0sMZRovJxG00pBFWPN
HbETDtj+jZoazR76PbQ7QU4KO7N6OskYXGjV9Qe4cS/0TGoKJU2AluIb31OjWxlU+85A
azxTp7cXVF2MWYt/i4fouLXlB2hNVzDgEExRh95yb8o7aNsb1VyPss5qOyiYBq3Vb9Qj
a05Ng+Yj7hEW1II0nf7VjZmiF19sKaX7s7pg15vToB9Jm6vk8+K/4Py9NV17kDrVb+TK
dYfg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20130820;
h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
bh=q6Y+opi2vIgjmmILf7vySm89qm3HNt0gM400zxnexCQ=;
b=FIe3Up9wQukxxpWrUrJ2jQi6xbTYYQxTRVsC0Qi2oTVemtXlqjJ051yU3r1k2BSx6p
irF4wd+VdSOlDoBTmrNch35bnMYalP4WzK6OL5hf2EuZ75dghrYgeRZbXZojlsyluYNZ
i6+zHUMsOT1yYO5oGE6zbpU984Zy/N+mvqvG3quSRudTKRmNdmrJOwPGfzkry+lKdy3c
lGS3gez6cKrceHbDOZ5Mb29PCAzRQZXEdGyku3QyrZ3+pYcGwErxgqS2A6PnOug2MHx0
dAChaJhESxiHkRkg/KFlHTy/dXtddaVIBDXBBl4X6NQC+12fht54ONUbOOe2tth+KCdy
zuyQ==
X-Gm-Message-State: ABUngveBVmFLm9X3aSUQINn+R8ryVx5XFkqv3AVLD0GB8+qVUKUMb+95Jj9spwLnhFTbxrAvlrCYGsYmKXNU9A==
X-Received: by 10.25.43.12 with SMTP id r12mr5686281lfr.104.1477275842914;
Sun, 23 Oct 2016 19:24:02 -0700 (PDT)
MIME-Version: 1.0
From: "Atommann (atommann AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Mon, 24 Oct 2016 10:24:02 +0800
Message-ID: <CANDNR8oD1XumuegoYJEAbpEEzK_XEjv0WZ_rtiwg4DwoxNfK-Q@mail.gmail.com>
Subject: [geda-user] COSMAC ELF in gEDA and the power rail problem for logic ICs
To: geda-user AT delorie DOT com
Reply-To: geda-user AT delorie DOT com

Hi,

Recently I redraw[1] the cosmac elf microcomputer which was from the
Popular Electronics magazine 1976 August issue. And soldered one[2],
it works right away!

But when I was making it in gEDA I met a problem. For example for the
CD4013 D-type flip-flops symbols, it has built-in VDD and VSS nets.
But the pins for them are now shown. I searched gEDA's mainling list
and people suggested that you can make a symbol which only has the VDD
and VSS pins.

So I make these power symbols. But pcb says that:
Error! Element U12 pin 14 appears multiple times in the netlist file.
Error! Element U12 pin 7 appears multiple times in the netlist file.

U12 is CD4013.

I delete these power symbols and connect VDD to +5V and VSS to GND.
pcb gives me the following warming message.
Warning! Net "+5V" is shorted to net "VDD"
Warning! Net "GND" is shorted to net "VSS"

Any suggestions?

Thank you.

[1] https://github.com/magismoke/cosmac-elf
[2] https://www.flickr.com/photos/atommann/30489781476/in/dateposted-public/

-- 
Best regards,
Atommann

- Raw text -


  webmaster     delorie software   privacy  
  Copyright © 2019   by DJ Delorie     Updated Jul 2019