Chapter 7

Question 1

Uses of Registers

Answer 1

Used as scratchpad for executing program and stores info on status of CPU

Question 2

Special Purpose Registers

Answer 2

• Program Counter Register (PC)
• Instruction Register (IR)
• Memory Address Register (MAR)
• Memory Data Register (MDR)
• Status Registers

Question 3

DRAM (Dynamic RAM) Vs SRAM (Static RAM)

Answer 3

DRAM are common, cheap, less power, and less heat while SRAM are faster and more expensive compared to DRAM

Question 4

Bus

Answer 4

Physical connection that makes it possible to transfer data from on location

Question 5

Parallel

Answer 5

High throughput because of all bits of word transmitted simultaneously

Question 6

Serial

Answer 6

1 bit transmitted at a time and single data line pair

Question 7

What are the 4 kinds of signals?

Answer 7

1) Data
2) Addressing
3) Control Signals
4) Power

Question 8

How to calculate width of register in bits?

Answer 8

2^k, K is the width of register in bits

Question 9

Memory Address Register (MAR)

Answer 9

holds the address of a memory location

Question 10

Memory Data Register (MDR)

Answer 10

Sometimes known as memory buffer register, hold data value

Question 11

Why are there two different registers (MAR and MDR) associated with memory? Also the significance to LMC

Answer 11

In a Memory Address Register (MAR) for example an 8-bit memory address would have a width of 256 bits calculated by 2k, but in a MDR it is basically a group of cells and the group of cells is 1 bit. In a little man computer, there are 100 bits (0 to 100). MAR is needed to get the addresses and a MDR is needed to perform a transfer between the MDR and the memory.