Dynamic storage
Dynamic ? temporary storage
- Advantages:
- Smaller cell than SRAM
- Small cell ? dense memory
- Disadvantages:
- Small capacitor ? small charge ? leakage problems
- Small transistors ? large resistance ? slow read/write
Capacitor leakage
- Thermal carriers generated in transistor’s depletion region
- Must refresh cell every 64ms
- Read the cell and write it back