Buses

Question 1

2-bus architecture - to be memorized!

Answer 1

Question 2

3 bus architecture - to be memorized

Answer 2

Question 3

• why the command ld is of great use?*
• How many steps does it take to perform “fetch” with 2-bus architecture?*
• How many steps does it take to perform 1 operand operations with 2-bus architecture?*
• How many steps does it take to perform 2 operands operations with 2-bus architecture?*

Answer 3

Because if we have a number of size 0<=x<=31 which is stored in some register, we can make ld save its value (5 LSB’s) in n and then we can use shift.

• still 3 instructions
• 1
• 2

Question 4

Notice

• Speed up formula
• fetch instruction
• 3-bus commands compare to 2 bus(2 bus is attached here(Multiplication case))

Answer 4