PROM (Programmable Read-Only Memory)

Overview

PROM is a type of ROM that can be programmed once after manufacturing. It offers flexibility compared to Mask ROM, allowing for customization at a later stage. Once programmed, the data remains permanent.

Detailed Explanation

Key Concepts

- One-time Programmable: Data is burned into the chip once.
- Customizable: Programmed by the user post-fabrication.

Characteristics

- Security: Data cannot be modified once programmed.
- Cost: More flexible than Mask ROM due to programmable capability.

Applications

- Custom firmware installations.
- Prototype development.
- Embedded systems with fixed instructions.

Examples

- Fuse PROM, where electrical fuses are blown to set bits.

Practice Problems

1. Explain the programming process of PROM.
2. Compare PROM with Mask ROM regarding flexibility and cost.
3. Discuss typical applications of PROM in embedded systems.

References

• Digital Design by Morris Mano
• PROM Overview

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