Added scripts to convert the statistics blocks to monte carlo
parameters that are compatible with ngspice syntax. 1st attempt;
application of the scripts is commented out in the makefile. Under
test and review.
diff --git a/VERSION b/VERSION
index 9730da8..5ea67cd 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.154
+1.0.155
diff --git a/sky130/Makefile.in b/sky130/Makefile.in
index 71af99c..34354fa 100644
--- a/sky130/Makefile.in
+++ b/sky130/Makefile.in
@@ -747,6 +747,17 @@
patch -p2 -f -d ${STAGING_PATH}/${SKY130A}/libs.tech/ngspice \
< custom/patches/sky130_fd_pr_5.patch \
2>&1 | tee -a ${SKY130A}_make.log || true
+ # Custom: Parse the (commented out) statistics blocks and generate
+ # ngspice-compatible monte carlo parameters for mismatch and process
+ # (currently under test)
+ # ./custom/scripts/mismatch_params.py \
+ # 2>&1 | tee -a ${SKY130A}_make.log || true
+ # ./custom/scripts/mismatch_params.py \
+ # ${STAGING_PATH}/${SKY130A}/libs.tech/ngspice \
+ # 2>&1 | tee -a ${SKY130A}_make.log || true
+ # ./custom/scripts/process_params.py \
+ # 2>&1 | tee -a ${SKY130A}_make.log || true
+
# Custom: Add "spinit" file
cat ./custom/models/spinit >> \
${STAGING_PATH}/${SKY130A}/libs.tech/ngspice/spinit
diff --git a/sky130/custom/scripts/mismatch_params.py b/sky130/custom/scripts/mismatch_params.py
new file mode 100755
index 0000000..1cb5ad8
--- /dev/null
+++ b/sky130/custom/scripts/mismatch_params.py
@@ -0,0 +1,118 @@
+#!/usr/bin/env python3
+#
+#--------------------------------------------------------------------
+# Parse the SPICE model files from sky130 and use the (commented out)
+# statistics block to generate the correct monte carlo expressions
+# in the device models for mismatch.
+#--------------------------------------------------------------------
+
+import os
+import re
+import sys
+
+mm_switch_param = 'MC_MM_SWITCH'
+
+walkpath = 'sky130A/libs.ref/sky130_fd_pr/spice'
+
+if len(sys.argv) > 1:
+ walkpath = sys.argv[1]
+
+mismatch_params = []
+
+mmrex = re.compile('^\*[ \t]*mismatch[ \t]+\{')
+endrex = re.compile('^\*[ \t]*\}')
+
+filelist = []
+
+#--------------------------------------------------------------------
+# Step 1. Gather variables
+#--------------------------------------------------------------------
+
+for dirpath, dirnames, filenames in os.walk(walkpath):
+ for filename in filenames:
+ if os.path.splitext(filename)[1] == '.spice':
+ infile_name = os.path.join(dirpath, filename)
+ filelist.append(infile_name)
+
+ infile = open(infile_name, 'r')
+
+ state = 'before_mismatch'
+ line_number = 0
+ replaced_something = False
+
+ for line in infile:
+ line_number += 1
+
+ if state == 'before_mismatch':
+ mmatch = mmrex.match(line)
+ if mmatch:
+ state = 'in_mismatch'
+ elif state == 'in_mismatch':
+ ematch = endrex.match(line)
+ if ematch:
+ state = 'after_mismatch'
+ else:
+ tokens = line.split()
+ if 'vary' in tokens:
+ if ('dist=gauss' in tokens) or ('gauss' in tokens):
+ mismatch_param = tokens[2]
+ std_dev = float(tokens[-1].split('=')[-1])
+ replacement = '{}*AGAUSS(0,{!s},1)'.format(mm_switch_param, std_dev)
+ mismatch_params.append((mismatch_param, replacement))
+
+ infile.close()
+
+print('')
+print('Mismatch parameters found:')
+for (mismatch_param, replacement) in mismatch_params:
+ print(mismatch_param + ' : ' + replacement)
+print('')
+
+#--------------------------------------------------------------------
+# Step 2. Make replacements
+#--------------------------------------------------------------------
+
+for infile_name in filelist:
+
+ filepath = os.path.split(infile_name)[0]
+ outfile_name = os.path.join(filepath, 'temp')
+
+ infile = open(infile_name, 'r')
+ outfile = open(outfile_name, 'w')
+
+ state = 'before_mismatch'
+ line_number = 0
+ replaced_something = False
+
+ for line in infile:
+ line_number += 1
+
+ if state == 'before_mismatch':
+ outfile.write(line)
+ mmatch = mmrex.match(line)
+ if mmatch:
+ state = 'in_mismatch'
+ elif state == 'in_mismatch':
+ outfile.write(line)
+ ematch = endrex.match(line)
+ if ematch:
+ state = 'after_mismatch'
+ elif state == 'after_mismatch':
+ newline = line
+ for (param, replacement) in mismatch_params:
+ if param in newline:
+ newline = newline.replace(param, replacement)
+ replaced_something = True
+ print(" Line {}: Found mismatch parameter '{}' and replaced with '{}'.".format(line_number, param, replacement))
+ outfile.write(newline)
+
+ infile.close()
+ outfile.close()
+ if replaced_something:
+ print("Something was replaced in '{}', backed up original file and replaced with processed one.".format(infile_name))
+ os.rename(infile_name, infile_name + '.orig')
+ os.rename(outfile_name, infile_name)
+ else:
+ print("Nothing was replaced in '{}'.".format(infile_name))
+ os.remove(outfile_name)
+
diff --git a/sky130/custom/scripts/process_params.py b/sky130/custom/scripts/process_params.py
new file mode 100755
index 0000000..1e59136
--- /dev/null
+++ b/sky130/custom/scripts/process_params.py
@@ -0,0 +1,125 @@
+#!/usr/bin/env python3
+#
+#--------------------------------------------------------------------
+# Parse the SPICE model files from sky130 and use the (commented out)
+# statistics block to generate the correct monte carlo expressions
+# in the parameters for process variation.
+#--------------------------------------------------------------------
+
+import os
+import re
+import sys
+
+pr_switch_param = 'MC_PR_SWITCH'
+
+walkpath = 'sky130A/libs.tech/ngspice'
+
+if len(sys.argv) > 1:
+ walkpath = sys.argv[1]
+
+process_params = []
+
+parmrex = re.compile('^\.param[ \t]+')
+prrex = re.compile('^\*[ \t]*process[ \t]+\{')
+endrex = re.compile('^\*[ \t]*\}')
+
+filelist = []
+
+#--------------------------------------------------------------------
+# Step 1. Gather variables
+#--------------------------------------------------------------------
+
+for dirpath, dirnames, filenames in os.walk(walkpath):
+ for filename in filenames:
+ if os.path.splitext(filename)[1] == '.spice':
+ infile_name = os.path.join(dirpath, filename)
+ filelist.append(infile_name)
+
+ infile = open(infile_name, 'r')
+
+ state = 'before_process'
+ line_number = 0
+ replaced_something = False
+
+ for line in infile:
+ line_number += 1
+
+ if state == 'before_process':
+ pmatch = prrex.match(line)
+ if pmatch:
+ state = 'in_process'
+ elif state == 'in_process':
+ ematch = endrex.match(line)
+ if ematch:
+ state = 'after_process'
+ else:
+ tokens = line.split()
+ if 'vary' in tokens:
+ if ('dist=gauss' in tokens) or ('gauss' in tokens):
+ process_param = tokens[2]
+ std_dev = float(tokens[-1].split('=')[-1])
+ replacement = ' + {}*AGAUSS(0,{!s},1)'.format(pr_switch_param, std_dev)
+ process_params.append((process_param, replacement))
+
+ infile.close()
+
+print('')
+print('Process parameters found:')
+for (process_param, addendum) in process_params:
+ print(process_param + ' :' + addendum)
+print('')
+
+#--------------------------------------------------------------------
+# Step 2. Make replacements
+#--------------------------------------------------------------------
+
+for infile_name in filelist:
+
+ filepath = os.path.split(infile_name)[0]
+ outfile_name = os.path.join(filepath, 'temp')
+
+ infile = open(infile_name, 'r')
+ outfile = open(outfile_name, 'w')
+
+ state = 'before_process'
+ line_number = 0
+ replaced_something = False
+
+ for line in infile:
+ line_number += 1
+
+ if state == 'before_process':
+ pmatch = prrex.match(line)
+ if pmatch:
+ state = 'in_process'
+ outfile.write(line)
+ else:
+ pmatch = parmrex.match(line)
+ if pmatch:
+ newline = line
+ for (param, replacement) in process_params:
+ if param in newline:
+ newline = newline.strip('\n') + replacement + '\n'
+ replaced_something = True
+ print(" Line {}: Found process parameter '{}' and appended '{}'.".format(line_number, param, replacement))
+ outfile.write(newline)
+ else:
+ outfile.write(line)
+ elif state == 'in_process':
+ outfile.write(line)
+ ematch = endrex.match(line)
+ if ematch:
+ state = 'after_process'
+ elif state == 'after_process':
+ outfile.write(line)
+
+ infile.close()
+ outfile.close()
+ if replaced_something:
+ print("Something was replaced in '{}', backed up original file and replaced with processed one.".format(infile_name))
+ os.rename(infile_name, infile_name + '.orig')
+ os.rename(outfile_name, infile_name)
+ else:
+ print("Nothing was replaced in '{}'.".format(infile_name))
+ os.remove(outfile_name)
+
