Combining Logic Gates Flashcards
What are adders
Electronic circuits to add binary numbers
Where are adders found
In the ALU of a CPU
What do half adders do
Calculates sum and stores value of a carry bit
What logic gates are in a half adder
AND
XOR
How many inputs in a half adder
2
How many inputs in a full adder
Three
(Includes one carry bit)
What do flip flops provide
Memory
What do flip flops do
Stores one bit and flips it between 0 and 1
What are the two inputs of flip flops
Control input
Clock signal
Why is the clock signal an input in flip flops
The clock signal changes state during short intervals or pulses
What does a d-type flip flop do
Input can only be changed from 1 to 0 or 0 to 1.
When does the input of a d-type flip flop change
When the computer’s clock pulse rises or at positive edge
