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 102

2026-11-05 05:14 PST (2026-11-05T13:14:26Z UTC) · commit a66d6cd (a66d6cdfeb583ddd1bbe5f9803b320b1f0633f1e)

ADOPTED

Escapes 17 (exp61 -> exp62): ULPI residue-first stubs – fence segments of D7/NXT ripped (they re-heal after the residue), D4 diagonal ripped back to its pad stub; stubs placed for D2, D3, DIR, STP, CK. D5 stub refused (one D4 staircase segment survived a shifted rip match) and RST stub refused by an NXT diagonal – both fixed in batch 18.

Nets fully routednot recorded
Pins failednot recorded
Clearance violations81
Unconnected nets62
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 102 — top

Bottom

Pass 102 — bottom

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