Question

1. What is the difference between a RAM and a ROM?

2. What are the significant differences between an SRAM and a DRAM?

3. You have a 16K X 8 bit RAM, how many address lines and how many outputs will it have?

4. You are developing a finite state machine controller with 4 inputs, 2 outputs, and 60 states. You would like to implement the controller’s logic using a ROM. What is the minimum ROM size needed for your design? Specify (a) the minimum number of address lines, (b) the minimum number of outputs, and (c) the minimum size of the ROM (i.e. MXN). Remember that your numbers have to be integers and that M, and N, have to be a power of 2.

5. You are developing a new generation of washing machines, and want to experiment with various circuit designs, all of which require some sort of ROM. You are on a short development schedule too, but cost is not a problem. Which of the below technologies would be appropriate? Check all that apply. a. Mask ROM, (b) PROM, (c) EEPROM, and (d) Flash ROM

6. You are developing the next generation operating system, and would like to have it implemented using a ROM. You have initially developed it but want to do Beta site testing and thereby will send out a copy to 20 of your long term customers. You expect testing will be for at least 20 weeks, and that updates for the system will occur every 2 weeks. The updates would be downloaded using the internet. Which of the above ROM technologies would be most appropriate for our design? List all that apply.

7. If you were designing a computer, circuit board space was at a premium, what type of RAM would you use: (a) SRAM or (b) DRAM?

8. If you have an integrated circuit device, that can hold 10 million transistors, and you want to design a SRAM circuit. The SRAM will words that are 2 bytes long. How many words can your chip store?

9. Let’s say you are going to sell a system that uses a ROM. If you go with an EPROM, the ROM cost will be $5. On the other hand, if you go with a Mask ROM, because of the mask charge, your first ROM will cost you $20,000, but each subsequent ROM will only cost $0.50. How many these boards will you have to sell in order to justify using the Mask ROM? Hint: you have to amortize the $20,000 over the number of boards you will sell

Answer 1

Ques.(1)

Ans:

Serial NO.	BASIS FOR COMPARISON	RAM	ROM
1	Basic	It is a read-write memory.	It is read only memory.
2	Use	Used to store the data that has to be currently processed by CPU temporarily.	It stores the instructions required during bootstrap of the computer.
3	Volatility	It is a volatile memory.	It is a nonvolatile memory.
4	Stands for	Random Access Memory.	Read Only Memory.
5	Modification	Data in RAM can be modified.	Data in ROM can not be modified.
6	Capacity	RAM sizes from 64 MB to 4GB.	ROM is comparatively smaller than RAM.
7	Cost	RAM is a costlier memory.	ROM is comparatively cheaper than RAM.
8	Type	Static RAM and dynamic RAM.	PROM, EPROM, EEPROM.

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