From 5a5761a35f03431fd2b921aaa451ba3a4bd9839d Mon Sep 17 00:00:00 2001 From: JC-000 <3798556+JC-000@users.noreply.github.com> Date: Sun, 26 Jul 2026 10:44:42 -0500 Subject: [PATCH] =?UTF-8?q?docs:=20confirm=20U64E=20comb=2048=20MHz=20poin?= =?UTF-8?q?t=20at=20n=3D6=20=E2=80=94=2018.39=20s=20median?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Rerun of the flagged single-point measurement from the 2026-07-25 U64E sweep: comb profile, 48 MHz only, n=6 per positive vector (20 runs total, all correctness-PASS). Median 18.39 s, spread 18.31-18.45 s (±0.4%) across all three positive vectors — the U64E number is solid, so the +12%-vs-C64U delta at 48 MHz is not U64E measurement noise. Residual uncertainty moves to the C64U's 16.5 s (itself n=2). Co-Authored-By: Claude Fable 5 --- CLAUDE.md | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/CLAUDE.md b/CLAUDE.md index 818c747..292f85e 100644 --- a/CLAUDE.md +++ b/CLAUDE.md @@ -644,9 +644,13 @@ three v0.6.0 profiles at HEAD, n=2 medians of the RFC 6979 vector, so the whole device delta is localized to REU DMA, not the CPU core. - **comb profile: parity at 16/32 MHz, +12% at 48 MHz** (18.4 vs - 16.5 s). Plausibly the Lim-Lee table fetches from REU bank 2 — - a DMA-anchored cost whose share grows with clock — but a single - n=2 point; re-measure before leaning on it. + 16.5 s). The U64E side is confirmed: a 2026-07-26 rerun at n=6 + per positive vector gave median 18.39 s, spread 18.31-18.45 s + (±0.4%) across all three vectors. Plausibly the Lim-Lee table + fetches from REU bank 2 — a DMA-anchored cost whose share grows + with clock. The residual uncertainty is the C64U's 16.5 s + (itself n=2); re-measure that side before treating the gap as + exactly 12%. - Crossovers vs REU shift down on the U64E because its REU floor is higher: onchip wins above ~18 MHz (C64U: ~22), comb above ~5 MHz (C64U: ~7). Comb still dominates no-comb onchip at