PDLVDS-RX — photodiode LVDS receiver

Clean-room receiver for the Miniscope Zero optical uplink: Excelitas C30737LH Si APD → OPA657 TIA → LMH7220 comparator (LVDS out, DAC-set threshold) → ADN2813 CDR → STM32H723 + USB3300 USB-HS. Design target: 50 Mbps line rate, 8b/10b (40 Mbps payload); the paper's mode: 8 Mbps Manchester (16 Mbaud), as transmitted. LT3757 flyback APD bias 150–420 V. USB-C powered; verify on any laptop over USB, no FPGA attached.

Pass 101

2026-11-05 05:08 PST (2026-11-05T13:08:43Z UTC) · commit 268880a (268880aa0cb6ce0712174edad98e2e415544cef8)

ADOPTED

ULPI fanout heal round 1 (exp60 -> exp61): D0, D1, D4, D6, D7, NXT CONNECTED in the new geometry (audit 65 -> 59 nets). Residue: single U7 pads D2/D3/D5/DIR/CK/STP/RST sealed at heal’s first move (fanout-order problem) – round 2 stubs them by hand first, then heals. Violations 71 -> 81 from heal grazes, violation campaign queued.

Nets fully routednot recorded
Pins failednot recorded
Clearance violations81
Unconnected nets59
Audit verdictFAIL

Routes — all copper layers and each layer

All layers
All layers — click the image to open the full-size SVG in a new tab.
All layersAll layers F.Cu layerF.CuIn1.Cu layerIn1.CuIn2.Cu layerIn2.CuB.Cu layerB.Cu

F.Cu In1.Cu In2.Cu B.Cu

Top

Pass 101 — top

Bottom

Pass 101 — bottom

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