Question

True and False

1. The instruction register stores machine code for the instruction being executed.

2. Before a digital computer may execute an instruction, the instruction code must be fetched from memory.

3. A pointer is a binary code for data in the arithmetic logic unit.

4. Von Neumann computer architecture stores data and instruction codes in the same memory.

5. Complex instruction set computers have instructions with greater speed than those in reduced instruction set computers.

Answer 1

1. True

Instruction register stores the current instruction that is being decoded. It is a binary word or code also known as opcode that defines the specific operation to be performed.

2. True

The program (series of instructions) is stored in the memory. These instructions are executed one by one. The first stage in the execution of an instruction is Fetching. During fetching the next instruction is fetched from the memory address that is currently pointed by program counter PC and is stored in the instruction register.

3. True

A pointer stores the address of the data. The address is in binary format.

4. True

Von Neumann architecture is based on stored-program concept where the instruction data and program data are stored in the same memory.

5. False

RISC processors have simple instructions taking about one clock cycle. The average clock cycle per instruction (CPI) is 1.5 . CSIC processor has complex instructions that take up multiple clocks for execution. The average clock cycle per instruction (CPI) is in the range of 2 and 15.