Day 6

Question 1

• What does it mean that RTN occurs one at a time?
• When A is used?
• How MA and MD are used?
• How many clocks each Ti line takes?

Answer 1

• At any given time there is only one data on the line; data saved inside a register. A translation of a register.
• A is used when we need to execute an instruction which involves the translation of two registers. (we save one of them in A)
• MA is used when we want to read an address from memory
• MD is used when we want to read from or write to a data in memory.
• one clock cycle per Ti

Question 2

How saving sign is done with disposition?

Answer 2

Question 3

Describe fetch & execute instruction

Answer 3

Question 4

Describe fetch&execute using concrete RTN

Answer 4

Question 5

Whenever you want to get an address from memory, how is it done?

Answer 5

You should copy the address to the MA register. Then the data of the address will be copied to the MD register.

Question 6

How is conditional branch evaluated?

Answer 6

• Cond() is evaluated by a combinational logic circuit having inputs from R[rc] and c3<2..0>
• The one bit register CON is not accessible to the user and only holds the output of the combinational logic for the condition.

Question 7

Describe the abstract RTN of shift right.

Answer 7

Question 8

Desctibe concrete RTN of shift right

Answer 8