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CF
FPGA Timing Constraint Library

The timing
constraint repo that should have
existed years ago.

Annotated .xdc, .sdc, .lpf, and .cst templates for every interface — with the theory, formulas, and toolchain guidance engineers actually need.

View on GitHub Timing Calculator AI Generator
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Interfaces covered
0
Boards supported
4
Toolchain formats
0
Annotated files
01
Interactive tool

Timing Budget
Calculator

Paste datasheet values — tCO, tSU, tH — and get the exact set_input_delay / set_output_delay lines. Shows setup and hold slack with a visual timeline. No guessing what the formula is.

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02
AI-powered New

AI Constraint
Generator

Paste your Verilog or VHDL top-level module. The AI reads every port, identifies clocks and interfaces, maps pins to your board, and writes the complete constraint file in seconds.

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