RFRAM vs ROM: Static RAM vs Dynamic RAM Explained
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This page covers the difference between RAM and ROM. It also covers the difference between static RAM and Dynamic RAM. Memories are of two types: primary and secondary.
RAM and ROM are types of primary memory.
Semi-random and serial access are types of secondary memory. Examples of semi-random memories include all disc memories such as CDs, DVDs, etc.
Examples of serial access memories include magnetic tape, magnetic bubble ferrite core, CCD, etc.
RAM vs. ROM
| Feature | RAM (Random Access Memory) | ROM (Read-Only Memory) |
|---|---|---|
| Access | Read/Write memory | Read-only memory |
| Volatility | Volatile memory (used for temporary data storage) | Non-volatile memory (used for permanent data storage) |
| Purpose | Stores data and instructions currently being used by the CPU | Stores boot instructions and firmware |
Static RAM vs. Dynamic RAM
| Feature | Static RAM (SRAM) | Dynamic RAM (DRAM) |
|---|---|---|
| Data Storage | Data is stored like a flip-flop (FF) | Data is stored in a MOS capacitor |
| Transistor Type | BJT, MOSFET is used | MOSFET is used |
| Speed | Faster operation | Slower operation |
| Power Dissipation | Higher power dissipation | Lower power dissipation |
| Density | Lower density | Higher density |
| Usage | Used as cache memory | Used as main memory |
| Refreshing | No refreshing needed | Refreshing is needed |
