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From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] Pin mapping (separate symbols from mappings)
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> I wonder how many users are making single-supply digital MSI circuits any more? These days, my pure logic tends to collapse into an FPGA, and my digital DRC concerns wind up being 2.5V logic versus 3.3V logic and electromagnetic fanout issues on unterminated logic lines.

You are right possibility to assign voltage or voltage intervals to pins would be useful. Most circuit I had worked with have an MCU and sometimes 15V to driver circuits.

Nicklas Karlsson