Digital Fundamentals Final 1
A triangle on the clock input
What symbol is used to identify edge-triggered flip-flops?
a triangle on the clock input
What symbol is used to identify edge-triggered flip-flops?
toggle
When both inputs of a J-K pulse- triggered J=1 K=1, and the clock cycles, the output will _____
2,4,8, etc.
When grouping cells within the Karnaugh map, the cells must be combined in groups of
a carry out of the sign position
When two positive signed numbers are added, the result may be larger than the size of the original numbers, creating overflow. This condition is indicated by
The output will follow the input on the leading edge of the clok
Which of the following describes the operation of a positive edge- triggered D flip-flop?
AB+CD
Which of the following expressions is in the sum of products form?
XY=X+Y
Which of the following is a form of DeMorgan's theorem?
Q output follows the input D when the ENABLE is high
Which of the following is correct for a gated D latch?
The first stage of a parallel full-adder may be a half adder.
Which of the following is correct for full adders
(A+B)(C+D)
Which of the following is in the product of sums form?
8
For the binary number 1000, the weight of the column with the 1 is
3
How many gates including inverters are required to implement the equation, X=A+AB+ ̅AB after it is simplified using Boolean algebra?
4
How many gates, including inverters, are required to implement the equation X=A+AB+ ̅AB, as it is written?
an invalid state is produced
If both inputs of an S-R flip-flop are low, what happens when the clock goes high?
1000
The 2's complement of 1000 is
Can be used to build all the other types of gates
The NAND gate is referred to as "universal" gate, because it _______
Input- 0 0, 0 1, 1 0, 1 1 Output- 0 1 1 0
The Truth Table for a 2 input XOR gate is
The sum output of a full adder
The expression (A⊕B)⊕Cin describes____
The carry output of a full adder
The expression AB+(A⊕B)Cin describes _____.
A OR B
The expression X=A+B means
1
The figure below represents one line from the truth table for a two- input NAND gate. A B X 1 0 ? For the inputs shown, what is the value of X?
3/4
The fractional binary number 0.11 has a decimal value of
One 4 input AND gate and two inverters
The function AB ̅ CD ̅ can be decoded with
44
The hexadecimal number 2C has a decimal equivalent value of
Two
The number of values that can be assigned to a bit are
(AB) ̅= A ̅+B ̅
The relationship between a NAND gate and a negative-OR gate is expressed by ______
(A+B) ̅=A ̅+B ̅
The relationship between a NOR gate and a negative AND gate is expressed by
Pulse Width
The time measurement between the 50% point on the leading edge of a pulse to the 50% point on the trailing edge of the pulse is called the
Fall Time
The time measurement between the 90% point on the trailing edge of a pulse to the 10% point on the trailing edge of the pulse is called the
It has no invalid input states.
What advantage does a J-K flip flop have over an R-S flip-flop?
Data storage (memory)
What is the primary function of a register?
provides a means of reducing complex Boolean expressions
A Karnaugh map _______
9
A decade counter counts from zero(0) through decimal _____.
multiplexer
A device that is used to switch one of several input lines to a single output line is called a
16
A multiplexer with four select, or address, lines can select ____ inputs.
Storage devices, comparators, data selectors
AND, OR, and NOT gates can be used to form
Q=1 Q ̅=0
An active-HIGH input S-R latch has a 1 on the S input and a 0 on the R input. What state is the latch in?
ASCII
An example of an alphanumeric code is
CRC
An example of an error detection method for transmitted data is the
Gray Code
An example of an unweighted code is