in system-gschemrc in the attribute-name section
add a line like
(attribute-name "eatmyshorts")
Now I wonder what Vref used to do (was ment to do)? I know for a number of pecl devices they have output pins that provide a reference voltage. The MC10EL32 pin 4 is labbled as Vbb where Vbb is a reference voltage output that is between 3.65 and 3.75 v at 25 degrees C. Logic High in should be greater then 3.87 V Logic Low in should be lower then 3.52 V. SO it looks like the reference voltage is a good comparitor voltage to differentiate the logic levels.
Steve Meier
p.s. I think when i have lots and lots of free time i will rewrite the documentation in Dr Sues fassion.
Stuart Brorson wrote:
Guys --
I recently came across some symbols with strange pin syntax which made
gattrib segfault. I have fixed gattrib to be robust against this
syntax, but I am now wondering if the syntax is valid or not.
Pins can have attribs attached to them. Here is an example pin with attribs:
P 300 4200 0 4200 1 0 1 { T 136 4250 5 8 1 1 0 0 1 pinnumber=1 T 136 4250 5 8 0 0 0 0 1 pinseq=1 }
On certain symbols I have found pins with simple text also attached. For example, here is a snippet of analog/CS5396-1.sym:
P 300 4200 0 4200 1 0 1 { T 136 4250 5 8 1 1 0 0 1 pinnumber=1 T 136 4250 5 8 0 0 0 0 1 pinseq=1 T 375 4150 3 8 1 0 0 0 1 Vref }
It has text "Vref" attached to the pin. Is this valid?
Many other symbols have this construct also.
More generally, is this syntax a good idea? That is, doing this means
that pins can be complexes, or at least have "primitive objects"
besides attributes. Does this serve a purpose? I was under the
impression that "primitive objects" only made sense for complexes
(components).
If it were me, I would say that pins may only have valid attribs attached, and nothing else. But I might be wrong. Is there ever a time that pins would need to have anything more than attributes attached?
Stuart
