jyelewis/sapling-cpuA from-scratch 8-bit computer: motherboard PBC, verilog cpu, operating system, and programs
Sapling test board is an open-source printed circuit board by jyelewis, from the jyelewis/sapling-cpu repository on GitHub. It is a 4-layer board of 140 × 85 mm with 33 parts on 65 nets, routed with 300 tracks and 44 vias.
It is built around the 74HC138D, EDT107M010S9LAA and LM1117IMPX-3.3/NOPB-HXY, with the MF-R300 and UJC-HP-3-SMT-TR among its other parts. Its parts include 8 diodes, 6 capacitors, 4 resistors, 3 ICs and 2 connectors.
Commands
make testmake run-sam SAM=pkg6_software/hello.sammake run-sam SAM=pkg6_software/primes.samViewing waveforms
uv run pytest pkg3_cpu_hdl/testbench/test_testbench.pysurfer build/cocotb/testbench/testbench.fst| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8 |
| 3 | 100nf | Capacitor_SMD:C_0805_2012Metric | C4, C5, C6 |
| 2 | 500nf | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 2 | 5100 | Resistor_SMD:R_0805_2012Metric | R3, R4 |
| 2 | 7segment SA56-11SURKWA | 7-segment:DIPS1524W75P254L1270H825Q10N | DS1, DS2 |
| 2 | LED driver TLC59281DBQR | LED driver:SOP64P600X175-24N | IC1, IC2 |
| 1 | +3.3v | TestPoint:TestPoint_Pad_D4.0mm | TP4 |
| 1 | +5v | TestPoint:TestPoint_Pad_D4.0mm | TP2 |
| 1 | 6800 | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 74HC138D | 3-8 decoder:SOIC127P600X175-16N | IC3 |
| 1 | 8200 | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | EDT107M010S9LAA | 100uf 10v Electrolytic cap:CAPAE830X650N | C3 |
| 1 | GND | TestPoint:TestPoint_Pad_D4.0mm | TP3 |
| 1 | LED Driver 2 sout | TestPoint:TestPoint_Pad_D4.0mm | TP1 |
| 1 | LM1117IMPX-3.3_NOPB | 3.3v regulator:SOT230P700X180-4N | PS1 |
| 1 | MF-R300 | Resettable fuse:MFR300 | F1 |
| 1 | Pin header BCS-112-L-D-PE | Pin header:BCS-112-XXX-D-PE | J1 |
| 1 | SIN between | TestPoint:TestPoint_Pad_D4.0mm | TP5 |
| 1 | TestPoint | TestPoint:TestPoint_Pad_D4.0mm | TP6 |
| 1 | UJC-HP-3-SMT-TR | USB-C plug:UJCHP3SMTTR | J2 |
It measures 140 × 85 mm and has 4 copper layers, 1.6 mm thick.
33 parts, built around the 74HC138D, EDT107M010S9LAA, LM1117IMPX-3.3/NOPB-HXY and MF-R300. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the jyelewis/sapling-cpu repository on GitHub, at the commit this page was made from: the board is pkg2_pcbs/sapling-test-board/sapling-test-board.kicad_pcb and its schematic pkg2_pcbs/sapling-test-board/sapling-test-board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask jyelewis before reusing the design.
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