📅 Friday, May 17th, 2024

A lie gets halfway around the world before the truth has a chance to get its pants on.

— Winston Churchill

ECS154A Lecture: memory cont’d

ROM: read-only, originally mask programmable (done during manufacturing)
- PROM: programmable
- EPROM: erasable (blast UV at wafer window), programmable
- EEPROM: electronically erasable, programmable
RAM (volatile)
- static (SRAM): value stays as long as power is supplied
- dynamic (DRAM): value must be refreshed periodically

We can build a $4k \times 8$ memory from $1k \times 8$ :