1. Purpose and scope
Implementation turns the netlist into a layout. For a space part, the layout itself is part of the mitigation: redundant copies must be placed far enough apart that one particle track cannot upset several, sensitive nodes need spacing and guard structures, and well ties must be dense enough to prevent latch-up where the technology is not immune by construction.
Sign-off covers the usual timing, power, reliability and physical checks, with corners that include the parameter shifts expected at end-of-life dose and the derating rules. The stage ends with tape-out, when the database is released with the package assembly drawings, and the export classification of the released data is confirmed.
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