28 February, 2000

The quiz

• still -- Wednesday, 1 March

Read-only memories (ROM)

• n address inputs
• m data outputs
• data is organized in words

Write the ROM

• Programmable ROM (PROM)
• Erasable PROM (EPROM)
• Electronicly EPROM (EEPROM)
• Flash memory

Programmable Logic Arrays (PLA)

• espresso was designed to generate PLA's
• organzation of a k × n × m PLA
  • k inputs
  • n ANDs (really NANDs)
  • m ORs (really NANDs)
  • some also have m XORs at the outputs
• programming the PLA
  • chose inputs (in AND array) for products
  • chose outputs (in OR array) of products
• PLA vs PAL
  • OR plane is fixed in the PAL
• Where it is headed