Did the circuit behave as expected? If no, what was wrong?

The Complete Microprocessor

Task 4-1: Build and Test the Memory-Address-Generation Circuit

Include a picture of your Digital circuit here:

Comment on the single biggest issue you were facing when designing the circuit.

Did the circuit behave as expected? If no, what was wrong?

Comment on the single biggest issue you were facing when simulating the circuit.

Task 4-2: Build and Test the Controller Circuit

Include a picture of your two_bit_mux circuit here:

Comment on the single biggest issue you were facing when designing the circuit.

Did the circuit behave as expected? If no, what was wrong?

Comment on the single biggest issue you were facing when simulating the circuit.

Include a picture of your two_bit_reg circuit here:

Comment on the single biggest issue you were facing when designing the circuit.

Did the circuit behave as expected? If no, what was wrong?

Comment on the single biggest issue you were facing when simulating the circuit.

Include a picture of your controller circuit here:

Comment on the single biggest issue you were facing when designing the circuit.

Did the circuit behave as expected? If no, what was wrong?

Comment on the single biggest issue you were facing when simulating the circuit.

Task 4-3: Build the Complete Microprocessor Circuit

Include a picture of your Digital circuit here (make sure to show final values as shown in figure 17):comment on the single biggest issue you were facing when designing the circuit.

Did the circuit behave as expected? If no, what was wrong?

Comment on the single biggest issue you were facing when simulating the circuit.

Task 4-4: Simulate the Design in Verilog

Include a picture of your waveforms here:

Comment on the single biggest issue you were facing when simulating the processor.

Did the circuit behave as expected? If no, what was wrong?

Comment on the single biggest issue you were facing when simulating the circuit.

Task 4-5: Add the AND, ZERO, SUB, and STORE ACC Instructions

Use Table 1 and Table 2 to enter your values into the microinstruction definition table for each of the four instructions asked for in the laboratory manual.  Be sure to label the name of each and every instruction.

Table 1
  Instruction AND ZERO
  Opcode 3 4
  step 00 01 02 03 00 01 02 03
Description Bit #                
next_step[1:0] 13:12                
unused 11:10                
use_pc 9                
load_mar 8                
arith 7                
invert 6                
pass 5                
load_acc 4                
acc_to_db 3                
read 2                
write 1                
load_ir 0                

 

Table 2
  Instruction SUB STORE ACC
  Opcode 5 6
  step 00 01 02 03 00 01 02 03
Description Bit #                
next_step[1:0] 13:12                
unused 11:10                
use_pc 9                
load_mar 8                
arith 7                
invert 6                
pass 5                
load_acc 4                
acc_to_db 3                
read 2                
write 1                
load_ir 0                

 

Test your instructions by writing and executing programs.  Record at least four programs and the output of each program in tables like that of Table 3.

Table 3
Program #0 ( Example: ADD = 3+5)
Address Value Operation (In English)
0 0 The ‘Load ACC’ Opcode
1 3 The number ‘3’ to be loaded into the Accumulator
2 1 The ‘Add to ACC’ Opcode
3 5 The number ‘5’ to be added to the Accumulator
4 2 The ‘Stop’ Opcode
     
What was the final output of your program? ___8__
Was the program successful? YES_
If not what error(s) did you find in your circuit?

 

Program   (  )
Address Value Operation (In English)
     
     
     
     
     
     
What was the final output of your program? _____
Was the program successful? Yes or No_
If not what error(s) did you find in your circuit?

 

Include a picture of your AND waveforms here:

Include a picture of your ZERO waveforms here:

Include a picture of your SUB waveforms here:

Include a picture of your STORE ACC waveforms here:

Did the circuit behave as expected? If no, what was wrong?

Comment on the single biggest issue you were facing when simulating the circuit.

Task 4-6: Invent Your Own Instruction (Extra Credit)

Table 4
  Instruction  
  Opcode 7
  step 00 01 02 03
Description Bit #        
next_step[1:0] 13:12        
unused 11:10        
use_pc 9        
load_mar 8        
arith 7        
invert 6        
pass 5        
load_acc 4        
acc_to_db 3        
read 2        
write 1        
load_ir 0        

 

Include your Verilog program here:

Include a picture of your waveforms here:

Include a picture of your ROM contents here:

Task 4-7: Create a video and submit your report

Record a short video showing your schematics in Digital and your waveforms in GTKWave. Be sure to show yourself in the video and show your screen. Explain how your circuit works – you need to convince the grader you did the lab and understand it. If your circuit is not working as expected, explain in the video how it is not working and why you think it is not working.