Latches Flashcards
What are Sequential Circuits
What are the Difference between Synchronous and Asynchronous Sequential Circuits
Circuits that depend on the current and previous states of the system
Synchronous - States change at discrete time intervals in accordance to a clock ,after changes to the input signals
Asynchronous - States change immediately after changes to the input signals
What is a Latch
What are the 3 Types of Latches
What is the Difference Between a Latch and a Flip-Flop
Temporary storage device that has two stable sates
Set Reset (SR) Latch
Data (D) Latch
Jack Kilby (JK) Latch
Latches are Asynchronous
Flip-Flops are Synchronous (Triggerened by rising (or falling) edges of a waveform)
Draw an Active High and Active Low SR Latch
Draw the Truth Table for an Active High SR Latch
Draw the Truth Table for an Active Low SR Latch
Explain How an SR Latch can become Unusable
When R,S = [1,1] then R,S [0,0]
Draw the Waveform for Q , S & R are inputs to an Active High SR Latch
Draw a Gated SR Latch for both Active Low and Active High SR Latches
What is an Edge Triggered Flip Flop
Draw a Block Diagram for positive edge Triggered and Negative Edge Triggered, for SR, JK and D Latches
Flip Flot that changes state at either the Rising or Falling Edge of the Clocks Waveform.
Positive Edge Triggered - Rising Edge
Negative Edge Triggered - Falling Edge
Gated SR Latch Waveform
Draw a D Latch
Draw a Truth Table and Characteristic Table for it.
What is the Characteristic Equation
Draw a Characteristic Table for a JK Flip flop
Draw a JK Flip Flop
Draw a JK Flip flop with Asynchronous Clear and Preset Functions
Draw the Truth Table for a the JK Flip Flop
Write out an expression for q(t+1) in Standard SOP Form
What Problem do D-Latches and Jk Flip flops solve from the SR Latch
Latch doesn’t Enter Unusable State
Avoids illegal States
What is the characteristic table and Truth Table for an Active High SR Latch
What is the characteristic table and Truth Table for an Active low SR Latch
What is the characteristic table and Truth Table for a D Latch
What is the Characteristic Equation
What is the characteristic table and Truth Table for a JK flip-flop
What is the Character tic Equation
