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Updated doc.

This commit is contained in:
Matthias Koefferlein 2021-06-28 22:53:08 +02:00
parent ab70c42c68
commit 8d45adcebd
2 changed files with 51 additions and 2 deletions
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14
src/lay/lay/doc/about/lvs_ref_global.xml
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@ -161,12 +161,24 @@ See <a href="/about/lvs_ref_netter.xml#same_device_classes">Netter#same_device_c
<keyword name="same_nets"/>
<p>Usage:</p>
<ul>
<li><tt>same_nets(circuit, net_a, net_b)</tt></li>
<li><tt>same_nets(circuit_pattern, net_pattern)</tt></li>
<li><tt>same_nets(circuit_pattern, net_a, net_b)</tt></li>
<li><tt>same_nets(circuit_a, net_a, circuit_b, net_b)</tt></li>
</ul>
<p>
See <a href="/about/lvs_ref_netter.xml#same_nets">Netter#same_nets</a> for a description of that function.
</p>
<a name="same_nets!"/><h2>"same_nets!" - Establishes an equivalence between the nets (must match)</h2>
<keyword name="same_nets!"/>
<p>Usage:</p>
<ul>
<li><tt>same_nets!(circuit_pattern, net_pattern)</tt></li>
<li><tt>same_nets!(circuit_pattern, net_a, net_b)</tt></li>
<li><tt>same_nets!(circuit_a, net_a, circuit_b, net_b)</tt></li>
</ul>
<p>
See <a href="/about/lvs_ref_netter.xml#same_nets">Netter#same_nets</a>! for a description of that function.
</p>
<a name="schematic"/><h2>"schematic" - Reads the reference netlist</h2>
<keyword name="schematic"/>
<p>Usage:</p>

39
src/lay/lay/doc/manual/lvs_compare.xml
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@ -52,7 +52,44 @@
</p>
<p>
For more information about "same_nets" see <a href="/about/lvs_ref_global.xml#same_nets">same_nets</a>.
"same_nets" can also be used to require a matching between specific nets.
This is useful on top level to check for matching nets assigned to specific pads.
This allows checking correct pad assignment. For example to check whether the
same net is attached to the "VDD" pad, label the net "VDD" in the layout and
specify:
</p>
<pre>same_nets!("CHIP", "VDD", "VDD")</pre>
<p>
The exclamation-mark version will report a net mismatch if either there is no
"VDD" net in either layout or schematic or if these nets to not match.
The above specification can be abbreviated as layout and schematic net name are identical:
</p>
<pre>same_nets!("CHIP", "VDD")</pre>
<p>
It's also possible to specify pattern for circuit names or net names.
This example requires all nets starting with "PAD" to have a counterpart
in layout and schematic for circuit "TOP" and each of these pairs has to match:
</p>
<pre>same_nets!("TOP", "PAD*")</pre>
<p>
So it is an error if there is a PAD1 net in layout but none in the schematic.
It is also an error if a net called PAD2 is there is layout and schematic but they
do not match.
</p>
<p>
"same_nets" and "same_nets!" can appear anywhere in the LVS script.
</p>
<p>
For more information about "same_nets" see <a href="/about/lvs_ref_global.xml#same_nets">same_nets</a> and
<a href="/about/lvs_ref_global.xml#same_nets!">same_nets!</a>.
</p>
<h2>Circuit equivalence hint</h2>