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Added a feature to the toolkit scripts for generated devices to 

allow ideal devices in an input netlist to be mapped to
automatically generated cells.  This works if the PDK toolkit
defines a device called either "capacitor" or "resistor".  The
device must be defined such that it can determine sane parameters
for the drawn device from only a value given in the netlist
(capacitance in farads, or resistance in ohms).
This commit is contained in:
R. Timothy Edwards 2026-03-17 11:32:53 -04:00
parent fd12c39c37
commit 8f95efc257
2 changed files with 23 additions and 3 deletions
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2
VERSION
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@ -1 +1 @@
8.3.623
8.3.624

24
tcltk/toolkit.tcl
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@ -12,6 +12,8 @@
# Added spice-to-layout procedure
# March 4, 2026
# Changed to make use of new "units" command
# March 26, 2026
# Added behavior to handle ideal capacitor and resistor devices
#--------------------------------------------------------------
# Sets up the environment for a toolkit. The toolkit must
# supply a namespace that is the "library name". For each
@ -281,8 +283,12 @@ proc magic::generate_layout_add {subname subpins complist library} {
set paramlist {}
# NOTE: This routine deals with subcircuit calls and devices
# with models. It needs to determine when a device is instantiated
# without a model, and ignore such devices.
# with models. There are two exceptions, for toolkits which
# wish to implement a way to generate unmodeled capacitors or
# resistors based on value; for example, metal interdigitated
# capacitors. For those exceptions, the device value is recast
# as a parameter called "value", and the device is given a model
# "capacitor" or "resistor", respectively.
# Parse SPICE line into pins, device name, and parameters. Make
# sure parameters incorporate quoted expressions as {} or ''.
@ -326,6 +332,20 @@ proc magic::generate_layout_add {subname subpins complist library} {
set devtype [lindex $pinlist end]
set pinlist [lrange $pinlist 0 end-1]
# Ideal device check: "devtype" will start with a digit.
# The instname will begin with "c" or "r".
if {[regexp {^([0-9\.]+.*)} $devtype pval]} {
set comptype [string tolower [string range $instname 0 0]]
if {$comptype == "c"} {
lappend paramlist [list value $pval]
set devtype capacitor
} elseif {$comptype == "r"} {
lappend paramlist [list value $pval]
set devtype resistor
}
}
set mult 1
foreach param $paramlist {
set parmname [lindex $param 0]