Suppose the following LMC instructions are found in the given locations in memory:
Mailbox Address
Mnemonic Code
15 16
LDA 40 ADD 41
40 41
723 021
Show the CPU Fetch Execute cycle steps and the values of Instruction Register (IR); the Program Counter (PC), the Memory Address Register (MAR); the Memory Data Register (MDR); and Accumulator (A) when the instruction in address 15 is completed: [10 marks]
FIE cycle
Register Values
b Show the CPU FIE cycle steps and the contents of each register as each step of the FIE cycle is performed for instruction 16. [30 marks]
FIE cycle
PC
MAR
MDR
IR