LightRail Eval Board
About the LightRail Eval Board
LightRail Eval Board is an open source FPGA PCB design by lightrail-dev, published on GitHub. It is a 22-layer board measuring 100 × 100 mm, with 187 components from 53 distinct parts.
Its main chip is the XC7A100T-1FTG256C, from the FPGA family. Other key parts include the LR-NCE-MPW-001, LR-TFLN-PIC-001, ADP7118AUJZ-0.9-R7, TPS7A2018DBVR and TPS7A2010DBVR. By type, the board carries 92 capacitors, 42 resistors, 16 test points, 15 ICs, 10 connectors and 6 diodes.
It belongs with the dev boards & breakouts designs in this gallery.
From the project
Project: LightRail AI Compute Node (Dual-CPO, NCE + HBM4 co-packaged, 1.6 Tbps photonic I/O) Model: LR-P3A Revision: 6.3 (32-layer HDI, IPC-6012 Class 3, 1000 A PDN — fully routed) Date: 2026-05-18 Company: LightRail AI
Project: LightRail AI Compute Node (Dual-CPO, NCE + HBM4 co-packaged, 1.6 Tbps photonic I/O) Model: LR-P3A Revision: 6.3 (32-layer HDI, IPC-6012 Class 3, 1000 A PDN — fully routed) Date: 2026-05-18 Company: LightRail AI
See docs/Architecture.md for the block diagram and signal-flow description.
See docs/Stackup.md for the impedance target for each net class against the assumed dielectric stackup.
Main components on the LightRail Eval Board
LightRail Eval Board bill of materials (BOM)
187 components, 53 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LR-NCE-MPW-001 NCE_TEST_CHIP | QFN-64_8x8mm_P0.4mm | U1 |
| 1 | XC7A100T-1FTG256C XC7A100T | BGA-256_14x14mm_P0.8mm | U2 |
| 1 | LR-TFLN-PIC-001 TFLN_PIC | Custom_Optical_Module | U3 |
| 1 | ADP7118AUJZ-0.9-R7 ADP7118-0.9V | SOT-23-5 | U10 |
| 2 | TPS7A2018DBVR TPS7A20-1.8V | SOT-23-5 | U11, U14 |
| 1 | TPS7A2010DBVR TPS7A20-1.0V | SOT-23-5 | U12 |
| 1 | TPS7A3301DBVR TPS7A33-3.3V | SOT-23-5 | U13 |
| 1 | TPS54360DDAR TPS54360 | HSOP-8 | U15 |
| 1 | Si5395A-A-GM Si5395A | QFN-28_5x5mm | U20 |
| 1 | AD7928BRUZ AD7928 | TSSOP-20 | U21 |
| 1 | FT232HQ FT232H | QFN-48_7x7mm | U22 |
| 1 | W25Q128JVSIQ W25Q128JVS | WSON-8_2x3mm | U23 |
| 1 | AD5684RBRUZ AD5684R | TSSOP-16 | U24 |
| 1 | TMP461AIDR TMP461 | WSON-8_2x2mm | U25 |
| 1 | SiT5356AI-33-25E-100.000000 100MHz_TCXO | 3.2x2.5mm | Y1 |
| 1 | PJ-002AH Barrel_Jack | PJ-002AH | J1 |
| 1 | USB4110-GF-A USB-C | USB_C_16pin | J2 |
| 1 | — 2-pin_Power | PinHeader_1x02_P2.54mm | J3 |
| 1 | — JTAG_2x5 | PinHeader_2x05_P1.27mm | J5 |
| 1 | — GPIO_2x7 | PinHeader_2x07_P1.27mm | J6 |
Show 33 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 142-0701-851 SMA_RF1 | SMA_Edge | J7 |
| 1 | 142-0701-851 SMA_RF2 | SMA_Edge | J8 |
| 1 | 142-0701-851 SMA_RF3 | SMA_Edge | J9 |
| 1 | 142-0701-851 SMA_RF4 | SMA_Edge | J10 |
| 1 | — MPO_Fiber | MPO-24 | J11 |
| 1 | 0805L200SLYR Fuse_2A | 0805 | F1 |
| 1 | B3F-1000 Reset | Tactile_4.5x4.5mm | SW1 |
| 16 | — Test_Point | TP_0.8mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +8 |
| 1 | 150060GS75000 LED_Green | 0603 | D1 |
| 1 | 150060BS75000 LED_Blue | 0603 | D2 |
| 1 | 150060RS75000 LED_Red | 0603 | D3 |
| 1 | 150060YS75000 LED_Yellow | 0603 | D4 |
| 2 | PRTR5V0U2X ESD_Diode | SOD-323 | D5, D5_2 |
| 1 | 744043004R7 4.7uH | IND_5x5mm | L1 |
| 2 | BLM18PG121SN1D Ferrite_Bead | 0603 | L2, L3 |
| 2 | GRM21BR61E226ME44L 22uF | 0805 | C1, C1_2 |
| 4 | GRM188R61E106MA73D 10uF | 0603 | C2, C2_2, C2_3, C2_4 |
| 8 | GRM155R60J475ME47D 4.7uF | 0402 | C3, C3_2, C3_3, C3_4, C3_5, C3_6, C3_7, C3_8 |
| 12 | GRM155R61E105KA12D 1uF | 0402 | C4, C4_2, C4_3, C4_4, C4_5, C4_6, C4_7, C4_8 +4 |
| 24 | GRM155R71E104KA88D 100nF | 0402 | C5, C5_2, C5_3, C5_4, C5_5, C5_6, C5_7, C5_8 +16 |
| 8 | GRM155R71H103KA12D 10nF | 0402 | C6, C6_2, C6_3, C6_4, C6_5, C6_6, C6_7, C6_8 |
| 4 | GRM1555C1H102JA01D 1nF | 0402 | C7, C7_2, C7_3, C7_4 |
| 8 | GRM1555C1H101JA01D 100pF | 0402 | C8, C8_2, C8_3, C8_4, C8_5, C8_6, C8_7, C8_8 |
| 4 | GRM1555C1H220JA01D 22pF | 0402 | C9, C9_2, C9_3, C9_4 |
| 16 | GRM033R71A104KA01D 100nF_AC | 0201 | C10, C10_2, C10_3, C10_4, C10_5, C10_6, C10_7, C10_8 +8 |
| 2 | T520D107M016ATE070 100uF_Tant | D_7343 | C11, C11_2 |
| 12 | RC0402FR-0710KL 10k | 0402 | R1, R1_2, R1_3, R1_4, R1_5, R1_6, R1_7, R1_8 +4 |
| 6 | RC0402FR-074K7L 4.7k | 0402 | R2, R2_2, R2_3, R2_4, R2_5, R2_6 |
| 8 | RC0402FR-07100RL 100 | 0402 | R3, R3_2, R3_3, R3_4, R3_5, R3_6, R3_7, R3_8 |
| 4 | RC0402FR-0749R9L 49.9 | 0402 | R4, R4_2, R4_3, R4_4 |
| 4 | RC0402FR-07330RL 330 | 0402 | R5, R5_2, R5_3, R5_4 |
| 4 | RC0402JR-070RL 0 | 0402 | R6, R6_2, R6_3, R6_4 |
| 4 | RC0402FR-071KL 1k | 0402 | R7, R7_2, R7_3, R7_4 |
LightRail Eval Board design files
The KiCad project lives in the lightrail-dev/new repository on GitHub; these links point at the commit this page was built from.
LightRail Eval Board: common questions
What microcontroller does the LightRail Eval Board use?
The LightRail Eval Board is built around the XC7A100T-1FTG256C, from the FPGA family.
How big is the LightRail Eval Board?
The LightRail Eval Board measures 100 × 100 mm, has 22 copper layers and is 2.4 mm thick.
How many components are on the LightRail Eval Board?
187 components, from 53 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the LightRail Eval Board design files?
From the lightrail-dev/new repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the LightRail Eval Board design in my own project?
The repository has no license, so all rights stay with lightrail-dev. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the LightRail Eval Board without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug FPGA firmware against it before you order a PCB.
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