week 5 datapath

Question 1

Central Processing Unit (CPU)

Answer 1

• the brain of the PC
• the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logic, controlling and input/output operations specified by those instructions.

Question 2

Program counter (PC)

Answer 2

A register in a computer processor that contains the address (location) of the instruction being executed at the current time.

Question 3

ALU (Arithmetic Logic Unit)

Answer 3

A combinational digital electronic circuit that performs arithmetic and logical operations.

Question 4

Datapath

Answer 4

pathway that the data flows through in a CPU; set up by control signals specified by an instruction to the CPU.

Question 5

Register file

Answer 5

contains small amount of data our processor operates upon.

Question 6

control memory

Answer 6

• holds control signals for our processor.

- holds the program we want our CPU to execute

Question 7

TEST box

Answer 7

Allows us to alter the value of the PC by testing what comes out of the ALU for a particular condition.

Question 8

what contains in Von Neumann Model?

Answer 8

Computer architecture contains 4 pieces:

1. Processing unit like ALU and register file
   - performs all of the calculations (overworked clerk)
2. Memory (for instructions and data memory)
3. Control unit (contains PC)
   - serves as index into program memory to indicate which instruction must be carried out by the processing unit.
4. Input/output
   - provides a means for information to be loaded into or read from the internals of the machine.

Question 9

what is the von Neumann loop step to carry out an instruction?

Answer 9

1. Fetch instruction from program memory
2. decode instruction from program memory which determines the control signals
3. execute instruction in ALU which commits data to register if needed.
4. update program counter and repeat loop

Question 10

What you need to build a basic CPU

Answer 10

1. memory
2. data and instruction
3. PC
4. ALU

Question 11

Components of NZP Tester

Answer 11

1. determine if incoming # is negative/zero/positive

2. compare incoming condition from user to output of part 1