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The May 7-11 series of wrapper-hardening attempts (cf_wrapper_v6 through v11) all failed to eliminate the 208 cosmetic LVS pin-match errors. The root cause is a Magic SPICE-extraction limitation: it collapses constant-tied output nets into shared global power/ground nets, losing per-pin labels. Per-pin conb_1 cells (v8) and placement tweaks don't change this behavior; v9/v10 regressed to 1300-1800 routing DRC errors; v11 was interrupted. This commit: - Restores the working tree to the May 7 PDN-fix wrapper (HEAD before experiments started). - Archives the v6-v11 experiment files under experiments/ with a per-file README explaining what was tried and why it failed. Large binary debris (mag, multicorner spef, uncompressed wrapper GDS) is preserved locally but excluded from git via a local .gitignore. - Adds docs/LVS_WAIVER.md formally requesting the 208 cosmetic LVS errors be accepted as Magic-extraction artifacts. Cites netgen's own "Device classes equivalent" / "Cell pin lists altered to match" lines, the v8 disproof that per-pin tieoffs cannot fix this, and the 17/19 mpw_precheck PASS at cf_wrapper_v5 (May 1, 2026). - README.md now links the waiver from the Precheck Results section. - .gitignore adds /precheck_logs/ for local snoke run logs. The submission ships with the May 7 cf_wrapper_v5 + PDN-fix wrapper (commit 8cc8414). All 5 GLS cocotb tests pass (GPIO=0xAB). Magic DRC clean. 17/19 mpw_precheck. The cosmetic LVS pin-match issue is documented in the waiver and not fixable by wrapper-only hardening. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
9 lines
398 B
Plaintext
9 lines
398 B
Plaintext
# Binary debris from failed v6-v11 wrapper hardening experiments.
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# The text files (manual_tieoffs.vh, manual_placements.json, README.md)
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# in this directory capture all the lessons. The binaries below are
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# regenerable by re-running `cf harden user_project_wrapper` with the
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# v8 config and have no future analytical value, so they are not tracked.
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mag/
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spef_multicorner/
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user_project_wrapper.gds
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