Marking of Assignment 3

Part 1

• For cpu_package.vhd:
  • 1 for byte declaration
  • 1 for instruction mnemonic declarations
  • 1 for direction type and constant declarations
• For rom.vhd:
  • 1 for an entity declaration
  • 1 for any reasonable architecture
• For stack_register.vhd:
  • 1 for an entity declaration
  • 1 for a selected/conditional assignment
  • 1 for a register-instantiating process
• For ROM simulation:
  • 5 marks (1/4 mark per correct output) (but 0 marks if opcodes do not match student number)
• for stack_register simulation:
  • 3 marks for correct stack up/down/hold operation (1 mark for each correct load)

Part 2

• 1 for the top-level entity declaration
• for the architecture:
  • 2 marks for stack instantiation (0.5 per register)
  • 2 marks for PC and O registers (1 each)
  • 4 marks for instruction decoding logic: (1 each for X, Y and PC registers, 1 for stack direction)
• for simulation results:
  • for I=1: 5 marks for correct output (on for about 12 cycles, off for about 27)
  • for I=4: 5 marks for correct output (on for about 27 cycles, off for about 12)