Module – 7 :
1Explain the differences between :
aStatic & Dynamic memories
bVolatile and Non Volatile memories
cBipolar & MOS memories
dRandom access and read only memories
eSemiconductor and magnetic memories
2Explain briefly the different type of ROMs
3Explain different types of fuse technologies that are used in PROM
4Explain why and EPROM is or is not a volatile memory
5What are the advantages of an EEPROM oven an EPROM
6What is a RAM? Draw and explain he circuit of a typical cell of bipolarRAM
7Describe the input conditions needed to read a word from a specific RAM address location
8How does a static RAM cell differ from a dynamic RAM? What are the advantages of dynamic RAM over static RAM
9A certain memory has a capacity of 16 K x 32. How many words does it store? What is the number of bits per word? How many memory cells does it contain?
10How many 16 K x 1 RAMs are required to achieve a memory word capacity of 16 K and a word length of 8 bits?
11To expand the 16 K x 8 memory to a 32 K x 8 organisation, how many more 16 K x 1 RAMs are required?
12What is the hex address range for 4 K x 8 ROM with hex addresses starting from 6000H
13How many memory locations are there for address values from C000 to C3FF?
14A certain memory stores 8K sixteen bit words. How many data input and data output lines does it have? How many address lines does it have? What is its capacity in bytes?
15A ROM has 11 address lines and 8 data lines. Calculate
aThe number of bits stored
bThe organisation of the memory
16Figure below shows the basic block diagram of 1024 x 1 RAM. Draw a diagram to show how four such RAMs could be connected to give a 1024 x 4 memory.
17a) A ROM has 12 address lines. Calculate the number of memory locations
b) A ROM is organized as 8 K x 8. List the function of the necessary IC
pins. What is the minimum number of pins required?
c) A 64 bit square memory matrix is addressed by the binary number
110100. In which row and in which column is the wanted location?
18a) A RAM has 4096 addressable locations. How many address pins does
it have? If there are four date input/ output pins what is the organization
of the RAM? What other pins are also required?
b)Explain the functions of the CS and R / W pins on a RAM chip.
Why does a ROM not have an R / W pin? Why is a decoder employed
in the addressing of a location in both a RAM and a ROM?
19Draw a ROM to implement the Boolean functions
F = ABCD + ABCD + ABCD + ABCD
G = AB + AB
Where letters in bold denotes complement
20A DRAM has inputs CS (chip select), OE (output enable), WE (write enable). Write down the truth table showing the functions of the device
21Briefly state the differences between
(a)SRAM, DRAM, EDO DRAM, BEDODRAM, VRAM, NOVRAM, and FRAM.
(b) ROM, PROM, EPROM, EEPROM, and flash ROM
21Draw figures to show how
a)Four 1K x 1 DRAMs can be connected together to form a 1K x 4
memory
b)Four 1K x 8 DRAMs can be connected to form a 4K x 8 memory
22A ROM has 15 address pins
a)How many words can it store?
b)A ROM can store 128K words. How many addresses must it have?
23A number of 32 K x 4 DRAMs are available. How many must be interconnected to form (a) A 512 K x 16 memory. (b) A 1M x 8 memory?
24(a) A memory is organized as 1M x 4. Calculate
(i) The number of locations in the memory
(ii) the total umber of bits stored.
(b)Repeat for 64K x 16 memory
25a) express in hexadecimal the lowest and the highest addresses of a (i) 32 x 4 EEPROM and (ii) a 1M x 4 DRAM
b) Calculate the size of each address
26Design a 64 x 16 memory using 64K x 4 ICs. The start address is 0H
27Implement the Boolean functions
F1 = ABCD + ABCD + ABCD,
F2 = ABCD + ABCD
F3 = ABCD + ABCD + ABCD + ABCD, using a ROM
The letters in bold indicates complement