Re: gEDA-user: net labels question

[Stuart Brorson <sdb@xxxxxxxxxx>]

> Does everyone understand a trailing underscore as negative logic?

No.

In my experience, a negatively asserted signal can be flagged in
several different ways, depending upon who is talking about the
signal.

In PCI bus land, signals asserted low are suffixed with a pound sign,
#.  For example:  TRST#.

For diff pair signals, e.g. LVDS & CML, I often see netnames suffixed
with _N and _P which indicate the logic sense of each net, for example
SIG_N, SIG_P.

I've also seen people suffix diff pair netnames with + or -, although
for reasons previously mentioned, that's probably not a good idea.

Personally, I've sometimes used the convention that low asserted
signals are suffixed with _L, for example RST_L.

I've also seen low asserted signals flagged using _N, e.g. LATCH_N.

I think there's no commonly accepted practice here....

Stuart


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