Encrypted DRC Deck - Extra Headers

[harrisonliew]

For those who run Calibre DRC in batch mode (i.e. not integrated in Virtuoso) via a wrapper deck with INCLUDE </path/to/drcRules_calibre_asap7.rul>, the encrypted DRC rule deck has extraneous SVRF statements in its header that cannot be changed or re-stated in the wrapper deck, or else Calibre will throw a cryptic SVRF syntax error. After consultation with @vvashish, they are:

LAYOUT SYSTEM                   GDSII
LAYOUT PATH                     "./test.gds"
LAYOUT PRIMARY                  TOPCELL
DRC SUMMARY REPORT              drc_report
DRC RESULTS DATABASE            drc_results.db

For the user, this means that:

• You must use GDS as input
• You must name your GDS as test.gds in the DRC run directory, or symlink to it as test.gds
• You must make sure your top level cell is named TOPCELL. A utility like gdstk can be used to change this in existing GDS files.
• You must not specify a custom summary report file or results database directory

In general, these header items should be user-defined and not encrypted.