EPROM (Erasable Programmable Read-Only Memory)
Overview
EPROM is a type of programmable ROM that can be erased and reprogrammed using ultraviolet light. This allows for repeated use during development or upgrading, though erasure requires special equipment and procedures.
Detailed Explanation
Key Concepts
- Erasable: Data can be removed by exposing the chip to UV light.
- Reprogrammable: Allows multiple cycles of programming and erasure.
Characteristics
- Non-volatile: Retains data after power is removed.
- Slower write/erase cycles compared to RAM.
- Requires specialized UV light exposure for erasure.
Applications
- Prototype firmware development.
- Systems requiring occasional firmware updates.
- Educational purposes for learning ROM programming.
Examples
- Traditional EPROM chips with quartz windows for UV exposure.
Practice Problems
- Describe the process of erasing an EPROM.
- Compare the advantages and limitations of EPROM versus PROM.
- Design a simple system where EPROM can be reprogrammed for updates.
References
- Digital Design by Morris Mano
- EPROM Overview