mmpviz 1.2.0

Memory Map / Address Map SVG Visualizer — turn a JSON description of your memory layout into a publication-quality SVG diagram

mmpviz — Memory Map / Address Map Visualizer

Turn a JSON description of your memory layout into a publication-quality SVG diagram.

No coordinates. No manual box placement. Just describe the address ranges and let mmpviz compute the layout.

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Install

pip install mmpviz

mmpviz has no runtime dependencies — stdlib only. Schema and cross-reference validation run automatically on every render.

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Quick Start

1. Create diagram.json

{
  "views": [
    {
      "id": "flash",
      "bits": 32,
      "sections": [
        { "id": "bootloader", "name": "Bootloader", "address": "0x00000000", "size": "0x8000" },
        { "id": "app",        "name": "Application","address": "0x00008000", "size": "0x78000" }
      ]
    }
  ]
}

2. Render

mmpviz -d diagram.json -o map.svg

3. Choose a layout algorithm (optional)

mmpviz -d diagram.json -o map.svg --layout algo4

Flag	Description
--layout algo1	One column per DAG level
--layout algo2	Algo-1 + height-rebalancing
--layout algo3	Algo-2 + routing lanes for non-adjacent links (default)
--layout algo4	Algo-3 + vertical column alignment to minimise link length

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Themes

Two built-in themes ship with mmpviz:

Theme	Flag	Appearance
default	-t default	Neutral gray fills, clean monochrome
plantuml	-t plantuml	Warm yellow fills, PlantUML-style palette

mmpviz -d diagram.json -o map.svg -t plantuml

Theme resolution — first match wins:

-t flag	theme.json next to diagram?	Theme used
-t plantuml (or any name/path)	yes or no	The -t value — sibling is ignored
(omit)	yes	The sibling theme.json
(omit)	no	Built-in default

For a custom theme, place a theme.json next to diagram.json and extend a built-in:

{ "schema_version": 1, "extends": "plantuml" }

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Features

• Zero required dependencies — pure Python stdlib
• Auto-layout — DAG-based column assignment, height rebalancing, routing lanes for crossing-free link bridges
• Multi-view diagrams — model interconnected address spaces with typed links (connector, band)
• Themes — built-in default and plantuml; fully customisable theme.json
• Per-section overrides — granular fill, stroke, height floor/ceiling per section or view
• Scales from MCUs to SoCs — tested on OpenTitan Earl Grey (65+ peripherals)

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More Examples

Real-world chip diagrams, theme showcases, and layout comparisons are in the examples/ directory on GitHub.

Full documentation: github.com/f33lgood/mmpviz