Pass 130

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.

2026-11-05 17:45 PST (2026-11-06T01:45:03Z UTC) · commit c528060 (c52806048ec4c98d5352e748c0565f21c2d94dcd)

ADOPTED

COURTYARD CAMPAIGN COMPLETE: 0 courtyard collisions. Consolidated placement session (parent, single pair of hands, audit->render->look->move loop) from pass 127’s board (exp121, 19 pairs): 20 moves over 19 parts closing every remaining pair – R11 (44.5,40)->(42.25,40) out of J3; C41 ->(41.25,59.75) closing C41xFB2 + C41xR40; C5 ->(21.95,42.87) closing C1xC5; C17 ->(71.95,9.5) closing C16xC17; D8 ->(12.5,44) closing D8xU1; C38 ->(20.93,67.02) + D4 ->(13.27,72.25) closing F1xC38 + F1xD4; R25 ->(8,-19.25) closing J5xR25; C33 ->(12.58,28.5) closing MH5xC33 (polygon; bbox still touches the round hole courtyard, shapes do not intersect); R32 ->(30.5,-4.05) closing R32xR31; C37 ->(8.25,60) closing R36xC37; R42 ->(55.46,58.5) closing R41xR42; R50 ->(32.84,-7.15) closing R49xR50; R1 ->(19.5,35.75) closing U1xR1 (nudge only, stays tight to the TIA); D6 ->(91.25,8.5), D7 ->(91.25,12), R44 ->(91.25,14.5) as one column east of X1 closing X1xD6 + X1xD7 and clearing MH2’s landing zone; R5 ->(16.25,50.5) closing U12xR5; MH2 ->(96.5,10.0) per the parent ruling closing U6xMH2. LINEAGE: this endpoint branches from pass 127 and SUPERSEDES the sibling item-3/4 positions in passes 128/129 for the shared clusters (MH2’s endpoint is identical; R44/D6/D7/R11/C33/R25 differ); passes 128/129 remain the record of that line. VICTIMS OWED on this board, repay first in the resumed routing queue: TEST_IN (R11 leg), GND (C41 leg), +5V (R25 leg), LED_PWR_K (D6 leg and R44 leg), LED_STAT + LED_STAT_A (D7 legs). SH1 still has no drawn courtyard – the one blind footprint, named until closed. Routing resumes from this board.