Regular structures for multilevel logic?
Arbitrary multilevel connections are hard
- Efficiency/speed/wiring issues
One answer: Multiple levels of PALs/PLAs/ROMs
- Generate intermediate results
- Cascade logic structures
Better answer: Field programmable gate arrays (FPGAs)
- Learn about in 467
- More general and more capable than PLAs or ROMS
- Easier to design than custom or semicustom ICs