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Flags

tmarhguy·alu·schematics/kicad/boards/flags/flags.kicad_pcb

Flags PCB layout, top view — open source board by tmarhguy
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About the Flags PCB

Flags is an open source PCB design by tmarhguy, published on GitHub under the MIT license. It is a 2-layer board measuring 41 × 35.5 mm, with 26 components from 4 distinct parts.

By type, the board carries 24 transistors and 2 connectors.

From the project

8-bit combinational ALU built from scratch with 3,488 CMOS transistors (KiCad + SPICE + Logisim + 1.24M tests

Generate 4 flags for ALU status and comparison: - LESS: A 0 (positive result) - COUT: Carry out (from adder)

Implementation: - 8× XOR gates (96T) - 8-input NOR gate (16T)

Logic: Cascaded priority comparison (MSB first)

Inputs: - A[7:0], B[7:0] - For comparison - OUT[7:0] - For POSITIVE detection - COUT_IN - From adder

Flags bill of materials (BOM)

26 components, 4 distinct parts.

QtyPartRefs
12
NMOS
Q201, Q210, Q211, Q212, Q213, Q214, Q215, Q216 +4
12
PMOS
Q202, Q203, Q204, Q205, Q206, Q207, Q208, Q209 +4
1
Conn_01x12_Pin
J101
1
Conn_01x16_Pin
J102

Flags design files

The KiCad project lives in the tmarhguy/alu repository on GitHub; these links point at the commit this page was built from.

Flags: common questions

How big is the Flags PCB?

The Flags measures 41 × 35.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Flags?

26 components, from 4 distinct parts. The full bill of materials is listed on this page.

Where can I download the Flags design files?

From the tmarhguy/alu repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Flags design in my own project?

Yes, under the terms of its MIT license, which tmarhguy chose for the repository.

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