EER-018
Introduction to
Digital Computers
Lecture 16
Programmable Logic
ROM - Read Only Memory
- non-volatile memory
- abstract model is the same as RAM, without WRITE capability
- internal logic
- decoder
- programmable OR array
- symbol
CD ROM
- Compact Disk ROM
- Physical structure
- Information organization
- Coding - pits and lands
- Read process - laser beam
- NRZ-i coding
- 8 to 14 modulation
- Error detection and correction
Sequential Logic Networks
- sequential logic network definition: digital system with outputs that
depend on both current and past inputs.
- state machine = sequential logic network
- state diagram
- digital counter
- structure of a sequential logic network
- current state, next state, inputs, outputs