Alexandria Higher Institute Of Engineering & Technology (AIET)
Mechatronics and Computer Department
ECE243 Digital electronics
Year: Second
Date:16/11/2011
Lecturer Dr. Amr Mahros & Committee
1.
Choose the best answer for the following statements

A memory with 256 addresses has
(a) 256 address lines
(c) 1 address line
(b) 6 address lines

A byte-organized memory has
(d) 8 address lines
(b) 4 data output lines
(d) 16 data output lines
(a) 1 data output line
(c) 8 data output lines
2.
Read the following statements carefully and mark them true or false
1.
A data byte consists of 8 bits.
2.
A memory cell can store a byte of data.
3.
The write operation can store data in memory.
4.
The read operation always erases the data byte.
5.
A 16M x 4 bits memory chip has the same capacity as a 32M x 2 bits memory chip.
6.
A 512K x 8 bits RAM may consist of two memory chips each of 256K x 8 bits.
7.
A 64M bits memory could be organized in 8K x 8 bits memory chip.
8.
A 512M x 8 bits RAM has the same number of word lines as a 512K x 8 bits RAM.
9.
A 512M x 8 bits RAM has the same capacity as a 256K x 16 bits RAM.
10.
A 512M x 8 bits RAM has the same number of bit lines as a 512M x 16 bits RAM.
11.
A 512M x 8 bits RAM has the same number of bit lines as a 512K x 8 bits RAM.
3.
Explain the purpose of the address bus.
4.
Explain the purpose of the data bus.
5.
What is the function of
R / W
input?
6.
Name the three groups of lines which connect the CPU and internal memory.
7.
List three characteristics of a semiconductor memory.
8.
List the actions which occur when CPU reads from memory.
9.
List the actions which occur when CPU writes to memory.
10.
What is the smallest unit of data that can be stored in a memory?
11.
What is the bit capacity of a memory that can store 256 bytes of data?
12.
A memory has a capacity of 2K x 8 find a) The number of words in the memory. b) The number of bits in each word. c) The total number of bits in the memory. d) The total number of memory cells in the memory.
13.
A certain memory has a capacity of 4K x 8 a) How many data input and data output lines are needed? b) How many address lines are needed? c) What is the number of bytes in the memory?
Sheet: 1