[Xcircuit-dev] Re: XCircuit questions

[R. Timothy Edwards]

Dear Roland,

> When making pin labels, how can I designate the power and ground pins
> as global labels?

   The "G" key macro will make global labels for power and ground
connections, or you can use the menu item "Netlist->Convert Label
To..." to change a regular label or local pin into a global pin.

> And what things can go into the PCB label (since I'll be using PCB next
> to layout the board)?

Currently, about the only useful thing that goes into a PCB label
is the "U?" line (in the templates), where the "?" is parameterized
so that it can be filled in by the auto-numbering routine.  This
ensures that each device makes it into the PCB output file, and
that each IC instance gets a unique index.

> Does anyone have any collected wisdom on a web page for this?  I'm
> looking through the online documentation, but it's missing a newbie
> mode for this stuff.

The tutorial

    http://xcircuit.ece.jhu.edu/tutorial/tutorial2.html

Is fairly inclusive;  especially, "Task 11" explains (for the most
part) how to create actual IC types from the templates.

> Right now I'm trying to take some of the IC templates and create
> some specific CMOS chips, e.g., the 4093.

Be sure to look at the "libraries" section of the XCircuit
website.  "diplib.tar.gz" has an extensive set of standard ICs,
as does "headerlib.tar.gz".  "hexparts.lps" is a different style
of usage (gates instead of ICs) but doesn't handle the power and
ground connections.

					Regards,
					Tim


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