Question 1
1- Create a model for JK’ flip-flop in Logisim that works according to the TTL 74LS109 ICspecification. You can use the JK flip-flop available in Logisim and modify it to work as a Jk’ flip-flop.Make sure the preset and clear works according to the specification of TTL 74LS109 IC.
2- Create a model for D flip-flop in Logisim that works according to the TTL 74LS74 IC specification. You can use the D flip-flop available in Logisim and modify its preset and clear functions to work according to the TTL 74LS74 IC specification.
3- Find out a procedure to build D flip-flop using Jk’ flip-flop and verify its operation with Logisim.
4- Find out a procedure to build Toggle flip – flop using D flip-flop and verify its operation with Logisim.
5- Build SR latch using logic gates in Logisim.
6- Complete the following Truth Table
.
Inputs to the Circuit SR Latch Inputs SR Latch Outputs
A B S R Q Q’
0 0 PreviousQ Previous Q’
0 1 1 0
1 0 0 1
1 1 Previous Q Previous Q’
7- Design the “Additional Circuit” block in Part E using the Truth table given in Task 6. Verify the operation of the circuit in Logisim.
8- Use Logisim software for verification
Question 2
In order to avoid undefined as an output value, the user must eliminate the condition at the very source by ensuring that both inputs never have the value “1”. This is done by creating an extension to the circuit where inputs to the SR are filtered to remove the possibility that both values are “1”. For this reason the JK flip flop often to prefer the SR flip flop.
Answer to question 1
Answer to question 2
