PAL : Program the AND connections
ROM:
- Fixed AND plane (all minterms)
- Programmable OR plane (choose minterms)
PLA:
- Programmable AND plane (compute PTs)
- Programmable OR plane (choose PTs)
PAL:TM Programmable Array Logic
- Programmable AND array (like PLA)
- Fixed OR array
- Each output is connected separately
- No sharing of ANDs
- Cheaper and faster than PLAs