Changes for sky130_sram macros.
Changed sram spice source from *.sp to *.lvs.sp because *.sp doesn’t have the correct memory cell parasitic devices.
Changed l and w units from meters to micrometers.
Reversed bus order in sram top subckt pins.
diff --git a/sky130/Makefile.in b/sky130/Makefile.in
index 32bd1a0..fae19ff 100644
--- a/sky130/Makefile.in
+++ b/sky130/Makefile.in
@@ -1331,7 +1331,7 @@
-lef %l/*/*.lef \
-lib %l/*/*.lib \
-gds %l/*/*.gds options=custom/scripts/gds_import_sram.tcl \
- -spice %l/*/*[0-9].sp filter=custom/scripts/sp_to_spice.py \
+ -spice %l/*/*.lvs.sp filter=custom/scripts/sp_to_spice.py \
-verilog %l/*/*.v \
-library general sky130_sram_macros 2>&1 | tee -a ${SKY130A}_make.log
diff --git a/sky130/custom/scripts/sp_to_spice.py b/sky130/custom/scripts/sp_to_spice.py
index bbcc641..1d0c91d 100755
--- a/sky130/custom/scripts/sp_to_spice.py
+++ b/sky130/custom/scripts/sp_to_spice.py
@@ -10,6 +10,7 @@
# the value to "filter=" for the model install in the sky130 Makefile.
import os
+import re
import sys
def filter(inname):
@@ -24,9 +25,69 @@
print('No such file ' + inname)
return 1
- print('Renaming file ' + filename + ' to ' + newname)
- os.rename(inname, outname)
- return 0
+ print('Converting file ' + filename + ' to ' + newname + ' by reversing buses and scaling l and w.')
+ # Read input
+ try:
+ with open(inname, 'r') as inFile:
+ stext = inFile.read()
+ slines = stext.splitlines()
+ except:
+ print('sp_to_spice.py: failed to open ' + inname + ' for reading.', file=sys.stderr)
+ return 1
+
+ fixedlines = []
+ modified = False
+ base_rex = re.compile(r'([^\[]*).*') # regular expression for matching base signal
+
+ for line in slines:
+
+ # remove 'u' suffix from 'l' and 'w' parameters
+ newline = re.sub('([ \t][lL]=[0-9\.]*)u', r'\1', line)
+ newline = re.sub('([ \t][wW]=[0-9\.]*)u', r'\1', newline)
+
+ # reverse bus indices - NOTE: Only works if all ports are on the subckt line
+ if newline.startswith(".subckt ") or newline.startswith(".SUBCKT "):
+ tokens = newline.split()
+ if tokens[1] == filebits[0]: # top subckt
+ bus_start = 2
+ last_base = base_rex.match(tokens[2])[1]
+ i = 3
+ while i < len(tokens):
+ base_match = base_rex.match(tokens[i]) # always matches one base net
+ if last_base != base_match[1]:
+ tokens[bus_start:i] = tokens[i-1:bus_start-1:-1] # reverse the bus indices
+ bus_start = i
+ last_base = base_match[1]
+ i += 1
+ tokens[bus_start:i] = tokens[i-1:bus_start-1:-1]
+ newline = " ".join(tokens)
+
+ if line != newline:
+ modified = True
+
+ fixedlines.append(newline)
+
+ # Write output
+ if outname == None:
+ for i in fixedlines:
+ print(i)
+ else:
+ # If the output is a symbolic link but no modifications have been made,
+ # then leave it alone. If it was modified, then remove the symbolic
+ # link before writing.
+ if os.path.islink(outname):
+ if not modified:
+ return 0
+ else:
+ os.unlink(outname)
+ try:
+ with open(outname, 'w') as outFile:
+ for i in fixedlines:
+ print(i, file=outFile)
+ except:
+ print('sp_to_spice.py: failed to open ' + outname + ' for writing.', file=sys.stderr)
+ return 1
+
if __name__ == '__main__':
