| #!/usr/bin/env python3 |
| # |
| # fix_io_cor_gds.py --- |
| # |
| # The purpose of this filter is to add the isolated substrate layer |
| # (GDS layer 23:5) to the ESD_CLAMP_COR cell, which is the only way to |
| # get the cell to be LVS-correct at that level of hierarchy. The layer |
| # is simply copied down from further up in the hierarchy. There is no |
| # mask change to the corner cell itself, but the change allows the corner |
| # cell to be read back from GDS, extract, and pass LVS. |
| |
| import os |
| import sys |
| |
| def filter(inname, outname): |
| |
| # Read input |
| try: |
| with open(inname, 'rb') as inFile: |
| data = inFile.read() |
| except: |
| print('fix_io_cor_gds.py: failed to open ' + inname + ' for reading.', file=sys.stderr) |
| return 1 |
| |
| # orig_data is the STRNAME record for ESD_CLAMP_COR. Insert the isosub layer |
| # data after this record. |
| orig_data = b'\x00\x12\x06\x06\x45\x53\x44\x5f\x43\x4c\x41\x4d\x50\x5f\x43\x4f\x52\x00' |
| |
| append_data = b'\x00\x04\x08\x00\x00\x06\x0d\x02\x00\x17\x00\x06\x0e\x02\x00\x05\x00\x3c\x10\x03\xff\xff\xff\x2e\x00\x03\x48\x2d\xff\xff\xff\x2e\x00\x04\x5b\xd2\x00\x04\x47\xf5\x00\x04\x5b\xd2\x00\x04\x47\xf5\x00\x04\x42\x14\x00\x04\x5a\x65\x00\x04\x42\x14\x00\x04\x5a\x65\x00\x03\x48\x2d\xff\xff\xff\x2e\x00\x03\x48\x2d\x00\x04\x11\x00' |
| |
| # This is not efficient, but only needs to be done once. |
| # Avoid doing it to any file other than the corner I/O. |
| |
| if '__cor' in inname: |
| data = data.replace(orig_data, orig_data + append_data) |
| |
| # 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): |
| os.unlink(outname) |
| |
| # Write output |
| try: |
| with open(outname, 'wb') as ofile: |
| ofile.write(data) |
| except: |
| print('fix_io_cor_gds.py: failed to open ' + outname + ' for writing.', file=sys.stderr) |
| return 1 |
| |
| |
| if __name__ == '__main__': |
| |
| # This script expects to get one or two arguments. One argument is |
| # mandatory and is the input file. The other argument is optional and |
| # is the output file. The output file and input file may be the same |
| # name, in which case the original input is overwritten. |
| |
| options = [] |
| arguments = [] |
| for item in sys.argv[1:]: |
| if item.find('-', 0) == 0: |
| options.append(item[1:]) |
| else: |
| arguments.append(item) |
| |
| if len(arguments) > 0: |
| infilename = arguments[0] |
| |
| if len(arguments) > 1: |
| outfilename = arguments[1] |
| else: |
| outfilename = None |
| |
| result = filter(infilename, outfilename) |
| sys.exit(result) |