Journey Towards IRAM

Sequential 2x2 Matrix Multiplier — Logisim Evolution

© 2026 ZayenCompiler — Original Work
github.com/ZayenCompiler

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What This Is

A 2x2 matrix multiplier built from scratch in Logisim Evolution.
Built progressively across three stages:

Circuit	Description
Core_2x2	Raw combinational multiply core
ROM_Matrix_Multiplication_2x2	Core + ROM controlled signals
IRAM_Matrix_Multiplication_2x2	Core + Instruction RAM + Program Counter

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How To Use

1. Download and install Logisim Evolution
2. Clone this repo
3. Open circuits/Journey_Towards_IRAM.circ
4. Select the circuit you want from the left panel
5. Load RAM values from /excel/ folder into RAM A and RAM B
6. Load instruction set values into Instruction RAM
7. Run simulation

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Instruction Set

16-bit instruction word.

Bits	Purpose
15	COMPUTE flag
14	STORE flag
13-4	Direct WE control signals
3-0	Spare / future use

Full instruction set documented in /docs/instruction_set.md

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Repo Structure

/circuits   → Logisim .circ files
/excel      → RAM input templates and instruction set
/docs       → Instruction set reference

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Requirements

• Logisim Evolution 4.x
• Java 11 or higher

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Built as a personal learning project.
Part of a larger series building toward a full sequential matrix multiplier.