DLD Final Exam ACTUAL QUESTIONS
AND CORRECT ANSWERS
ALU - CORRECT ANSWERS✅✅An arithmetic logic unit is a digital circuit that performs
arithmetic and logical operations. The ALU is a fundamental building block of the central
processing unit (CPU) of a computer.
Computer Architecture - CORRECT ANSWERS✅✅is the conceptual design and
fundamental operational structure of a computer system. It's a blueprint and functional
description of requirements and design implementations for the various parts of a computer,
focusing largely on the way by which the central processing unit (CPU) performs internally.
Register Transfer Statement- (RTS) - CORRECT ANSWERS✅✅Concisely describes a
computers operation in a single clock cycle
includes the source(s) operation and receiving destination.
Examples: A AND D => C
B Minus C => A
Register Transfer Language (RTL) - CORRECT ANSWERS✅✅The collection of all RTS
statements that are valid for a given computer architecture.
Multiplexed communication channel - CORRECT ANSWERS✅✅
Serial to Parallel conversion, comparator - CORRECT ANSWERS✅✅
4 by 4 sorting stack - CORRECT ANSWERS✅✅A zero time sorter (4 words deep by 4 bits
wide). The circuit has four bidirectional data inputs and three control inputs. It stores four 4-
bit numbers in sorted order.
What is bit slice? - CORRECT ANSWERS✅✅A design style in which the function is
decomposed to operate on a single generic bit of the machine and then is cascaded or
replicated in the design for as many bits as needed. It takes advantage of symmetry and
redundancy in digital systems.
, What is the fanout of 74LS parts? - CORRECT ANSWERS✅✅The output of a TTL logic
gate typically can drive 10 gate inputs of the same family.
Characteristic equations for S, D, JK? - CORRECT ANSWERS✅✅QD+=D
QJK+=JQ'+K'Q
QS+=S+R'Q
Set Up Time? - CORRECT ANSWERS✅✅Time prior to the clock when stored inputs must
not change.
Finite State Machine? - CORRECT ANSWERS✅✅Number of states possible is equal to
2^N where N is the number of Flip Flop's
Procedure (flow chart) for twos complement? - CORRECT ANSWERS✅✅Perform regular
addition on all bits, discard carryout of sign bit then check for overflow EXOR Carry in and
Carry Out of sign bit (if same fine, if different, overflow)
What is the maximum speed a FSM can be clocked? - CORRECT ANSWERS✅✅
What does TTL stand for? - CORRECT ANSWERS✅✅Transistor Transistor Logic and it is
a digital logic design in which bipolar transistor s act on direct-current pulses. Many TTL
logic gate s are typically fabricated onto a single integrated circuit (IC). TTL ICs usually have
four-digit numbers beginning with 74 or 54.
Moore Machine - CORRECT ANSWERS✅✅Z(Present State)
The output Z of a Moore Finite State Machine is only a function of the
Present State (Q outputs of Flip Flops)
-Usually Larger(more states and more logic)
+Outputs are Synchronous
Mealy Machine - CORRECT ANSWERS✅✅Z(Present State, Present Inputs)
AND CORRECT ANSWERS
ALU - CORRECT ANSWERS✅✅An arithmetic logic unit is a digital circuit that performs
arithmetic and logical operations. The ALU is a fundamental building block of the central
processing unit (CPU) of a computer.
Computer Architecture - CORRECT ANSWERS✅✅is the conceptual design and
fundamental operational structure of a computer system. It's a blueprint and functional
description of requirements and design implementations for the various parts of a computer,
focusing largely on the way by which the central processing unit (CPU) performs internally.
Register Transfer Statement- (RTS) - CORRECT ANSWERS✅✅Concisely describes a
computers operation in a single clock cycle
includes the source(s) operation and receiving destination.
Examples: A AND D => C
B Minus C => A
Register Transfer Language (RTL) - CORRECT ANSWERS✅✅The collection of all RTS
statements that are valid for a given computer architecture.
Multiplexed communication channel - CORRECT ANSWERS✅✅
Serial to Parallel conversion, comparator - CORRECT ANSWERS✅✅
4 by 4 sorting stack - CORRECT ANSWERS✅✅A zero time sorter (4 words deep by 4 bits
wide). The circuit has four bidirectional data inputs and three control inputs. It stores four 4-
bit numbers in sorted order.
What is bit slice? - CORRECT ANSWERS✅✅A design style in which the function is
decomposed to operate on a single generic bit of the machine and then is cascaded or
replicated in the design for as many bits as needed. It takes advantage of symmetry and
redundancy in digital systems.
, What is the fanout of 74LS parts? - CORRECT ANSWERS✅✅The output of a TTL logic
gate typically can drive 10 gate inputs of the same family.
Characteristic equations for S, D, JK? - CORRECT ANSWERS✅✅QD+=D
QJK+=JQ'+K'Q
QS+=S+R'Q
Set Up Time? - CORRECT ANSWERS✅✅Time prior to the clock when stored inputs must
not change.
Finite State Machine? - CORRECT ANSWERS✅✅Number of states possible is equal to
2^N where N is the number of Flip Flop's
Procedure (flow chart) for twos complement? - CORRECT ANSWERS✅✅Perform regular
addition on all bits, discard carryout of sign bit then check for overflow EXOR Carry in and
Carry Out of sign bit (if same fine, if different, overflow)
What is the maximum speed a FSM can be clocked? - CORRECT ANSWERS✅✅
What does TTL stand for? - CORRECT ANSWERS✅✅Transistor Transistor Logic and it is
a digital logic design in which bipolar transistor s act on direct-current pulses. Many TTL
logic gate s are typically fabricated onto a single integrated circuit (IC). TTL ICs usually have
four-digit numbers beginning with 74 or 54.
Moore Machine - CORRECT ANSWERS✅✅Z(Present State)
The output Z of a Moore Finite State Machine is only a function of the
Present State (Q outputs of Flip Flops)
-Usually Larger(more states and more logic)
+Outputs are Synchronous
Mealy Machine - CORRECT ANSWERS✅✅Z(Present State, Present Inputs)
