Logic circuits
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Tags | A2C19Notes |
Logic gate
Logic circuits
introduced the symbols for logic gates that are used in logic circuits and discussed the relationships between logic circuits, truth tables and logic expressions.
- This chapter introduces some specific circuits that are used to construct components that provide functionality in computer hardware.
Half adder
- A fundamental operation in computing is binary addition. The result of adding two bits is either 1 or 0.
- However, when 1 is added to 1 the result is 0 but there is a carry bit equal to 1. This cannot be ignored if two numbers with several bits in each are being added.
The full adder
Sequential logic circuits
- Combinational circuits the output is dependent only on the input values being applied at that time.
- sequential circuit the output depends on the input and on the previous output
the SR flip-flop
also refered to as ”latch”
is an example of sequential circuit
it can be constructed with 2NAND
The SR flip-flop
also refered to as 'latch' is an example of sequential circuit.
- it can be constructed with 2 NAND gates or 2 NOR gates
- One-bit memory