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Doc update

This commit is contained in:
Matthias Koefferlein 2021-07-04 19:23:30 +02:00
parent ae6f77f45f
commit 9f3d26af25
1 changed files with 29 additions and 2 deletions
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31
src/lay/lay/doc/manual/lvs_device_extractors.xml
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@ -3,9 +3,9 @@
<doc>
<title>LVS Devices Extractors</title>
<title>LVS Device Extractors</title>
<keyword name="LVS"/>
<keyword name="LVS Devices Extractors"/>
<keyword name="LVS Device Extractors"/>
<h2-index/>
@ -345,5 +345,32 @@ extract_devices(bjt3(model_name), { "C" => collector, "B" => base, "E" => emitte
<img src="/manual/bjtlat_ex_ts.png"/>
</p>
<h2>Device extractors and device classes</h2>
<p>
"extract_devices" will return the <class_doc href="DeviceClass">DeviceClass</class_doc> object of the devices generated.
This object can be useful to apply some basic modifications.
The most important of them is enabling or disabling certain parameters.
</p>
<p>
Most device extractors extract more parameters than they give you by default.
For example, the resitor extractor will not just extract the resistance, but also the length (L)
and width (W) of the resistor stripe and its area (A) and perimeter (P).
By default these additional parameters are declared "secondary" - i.e. they will not
show up in the netlist browser, they will not participate in the device compare and
will not be netlisted.
</p>
<p>
Parameters can be declared primary ones by using "enable_parameter" on the device class.
Hence it is possible to enable "W" and "L" on a resistor type using the following code:
</p>
<pre>dc = extract_devices(resistor("RES", 1), ...)
dc.enable_parameter("W", true)
dc.enable_parameter("L", true)
</pre>
</doc>