Questions and Answers
What will be the output of an even parity generator when the input data is 0111?
1
In octal, what is the equivalent of the number 140?
(86)10
When will the output of a NOR gate be high?
00
How many flip-flops are required to construct a mod-30 counter?
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How many address bits are needed to represent a 32k memory?
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What operation is equivalent to shifting a register content to the left by one bit position?
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Study Notes
Digital Logic Set 4
Parity Generator
- Even parity generator output is 1 when input data is 0111
Number System
- The octal number 140 is equivalent to 96 in decimal
Logical Gates
- NOR gate output is high when both inputs are 0
Flip-Flop
- 5 flip-flops are required to construct a mod 30 counter
- The output of SR flip-flop when S = 1, R = 0 is 1
Memory and Addressing
- 15 address bits are required to represent a 32k memory
- 4 control lines are required for a 16-to-1 multiplexer
Multiplexers and Demultiplexers
- The number of control lines for a 16-to-1 multiplexer is 4
Memory Types
- SRAM requires refreshing
- EPROM is a type of non-volatile memory
Shift Register
- Shifting a register content to the left by one bit position is equivalent to multiplication by 2
