Quiz2 : CLC SLC
FLIP FLOPS
- A binary storage device capable of storing one bit of information
Full Adder
- A combinational logic circuit that performs the arithmetic sum of 3 bits
1. Synchronous Sequential Circuit
- A system whose behavior can be defined from the knowledge of its signals at discrete instants of time.
Latches
- Are storage elements that operate with signal levels
Latches
- Building blocks of flip flops
Flip flops
- Edge sensitive devices
SEQUENTIAL LOGIC CIRCUITS
- Employ storage elements (flip-flops, latches) Their outputs are a function of the inputs and the state of the storage elements
Decoders
- Is a combinational circuit that converts binary information from n input lines to a maximum of 2n unique output lines
Full Subtractor
- Is a combinational logic circuit that delivers the subtraction of two bits, one is minuend, and the other is subtrahend considering the borrow of the earlier adjacent lower minuend bit.
Encoders
- It converts m-bit input code to a n-bit output code with n≤ m ≤ 2n such that each valid code word produces a unique output code
Asynchronous Sequential Circuit
- Its behavior depends upon the input signals at any instant of time and the order in which the inputs change.
Latches
- Level sensitive devices
SEQUENTIAL LOGIC CIRCUITS
- Output depends on input and memory/storage element
Characteristics
- State transition occurs at the rising edge or falling edge of the clock pulse
FLIP FLOPS
- Storage elements use in clocked sequential circuits
Half-Adder
- The output variables produce the sum and carry
Half-Adder
- This circuit needs two binary inputs and two binary outputs - The input variables designate the augend and addend bits
Latches
- Useful for storing binary information and for the design of asynchronous sequential circuits
Multiplexers
- can be designed to have m information inputs with m<2n as well as n selection inputs - Ex. 2 to 1 line Multiplexer
1. Synchronous Sequential Circuit 2. Asynchronous Sequential Circuit
2 types of Sequential Circuit
o D flip-flop o JK flip flop o T flip flop
3 types of flip flops
inputs: x and y may xor gate and and gate S= x XOR y C= xy
Half Adder simple circuit
Difference: XOR gate connected sa A and B Borrow: AND gate connected sa A' and B
Half Subtractor Simple circuit Diff: Borrow:
1. Latch 2. Flip Flops
Memory Elements (2)
clock
Synchronous Sequential circuit type of circuits achieves synchronization by using a timing signal called
COMBINATIONAL LOGIC CIRCUITS
This type of logic circuit reacts to values of the signals at their inputs and produce output signal
1. Combinational Logic Circuits 2. Sequential Logic Circuits
Types of Logic Circuits: (2)
Binary Adder
Used in adding 4 bits
Multiplexers
has n control inputs (Sn-1, ... S0) called selection inputs, 2n information inputs (I2n -1,..., I0) and one output Y
Half Subtractor
is a combinational logic circuit intended to subtract two single bits and generate two outputs (borrow and difference).
COMBINATIONAL LOGIC CIRCUITS
o Consists of logic gates whose outputs at any time are determined from only the present combination of inputs
COMBINATIONAL LOGIC CIRCUITS
o Has no memory
COMBINATIONAL LOGIC CIRCUITS
o is consists of input variables, logic gates and output variables
Multiplexers
selects information from an input line and directs the information to an output line
