Did the circuit behave as expected? If no, what was wrong? Comment on the single biggest issue you were facing when simulating the circuit.

The Complete Microprocessor
Name:______________________________________ Instructor/Time:___________________________
Date:_________________________________________________________________________________

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 :
Please 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:
Please comment on the single biggest issue you were facing when simulating the processor.
Did the circuit behave as expected? If no, what was wrong?
Please 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?
Please comment on the single biggest issue you were facing when simulating the circuit.
Include a picture of your rom_vals.hex if your made choice 1 or 2 or a picture of the ROM for choice 3 here:
Include your program from ram_vals.txt:

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! Copy and paste the link to your video below. Make sure the link is working and pointing to the correct video. Remember to include the password if required. Do NOT upload your video to Canvas or YouTube. 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.

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