Documents everything examined in the 2026-07-17/18 review - not just
findings but full coverage with verdicts, so future sessions know what
not to re-review: per-sheet verification against datasheets and the
WIZnet reference design, the settled look-wrong-but-correct list
(VPHY/VPLL on 3.3V, D4/D5 floating VBUS + flow-through, EN at 12V,
RSET 12.4k, no CT cap, DO/DI direction evidence), PCB/JLC/BOM audit
state, explicit not-reviewed list (bench/gateware items), and a binding
rule to keep the file updated in the same commit as any change to a
reviewed circuit. Referenced from CLAUDE.md alongside TODO.md.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Insertion by Dennis; reviewed:
- DRC 0 errors / 0 unconnected / 0 schematic parity
- R32-R35 sit in-line between the termination cluster and D4/D5, each
aligned to its own line row; MDI_* stubs only 1.45-1.48mm, no new
vias, all pair copper at the ETH_DP 0.2mm width
- Pair skew after insertion: TX 0.66mm, RX 1.81mm - both far inside
the 100BASE-TX budget
- C20/C21 placed against J2's pin column, about as close as the In1
plane void allows while keeping short GND vias
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Completes the WIZnet reference schematic for the MDI section:
- R32-R35 3.3R 1% (YAGEO RC0402FR-073R3L, LCSC C137986) in series in
each MDI line per WIZnet note 6 (EMI damping). Chain per line is now
U11 pin -> 49.9R termination tap -> 3.3R -> D4/D5 flow-through -> J2.
Chip-side nets keep PHY_*; the D4/D5-side segments are renamed MDI_*
and added to the ETH_DP netclass patterns so the impedance DRC rules
police both halves.
- C20 100nF (C1525) + C21 1uF (C15849) on ETH_3V3 per WIZnet note 7 -
to be placed AT J2 pins 4/5 tapping the In2 ETH_3V3 island.
(Also carries KiCad's resave/reposition of ethernet.kicad_sch from the
rework session - netlist-identical, verified.)
Verified: ERC 0, netlist 121 components vs BOM 120 (J3-only delta),
PHY_TX_P = {U11.3, R26.1, R32.1}, MDI_TX_P = {R32.2, D4.1}, and
likewise for all four lines. PCB: 6 footprints to place (cut the lines
between termination and D4/D5 for R32-R35; C20/C21 at the jack).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Dennis Brentjes
Roflin