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The outputs of the gates assume at all times the value of the Boolean function, implemented by the circuit. In contrast, a dynamic circuit relies on temporary storage of signal values on the capacitance of high impedance circuit nodes.
Logic Gates. Basic logic circuits with one or more inputs and one output are known as gates. • Gates are used as the building blocks in the design of more complex digital logic circuits. Representing Logic Functions. There are several ways of representing logic functions: Symbols to represent the gates. Truth tables. Boolean algebra.
Objectives. At the end of the course you should. Be able to design and construct simple digital electronic systems. Be able to understand and apply Boolean logic and algebra – a core competence in Computer Science. Be able to understand and build state machines.
A static CMOS gate is a combination of two networks, called the pull-up network (PUN) and the pull-down network (PDN) (Figure 6.2). The figure shows a generic N input logic gate where all inputs are distributed to both the pull-up and pull-down networks. The func-tion of the PUN is to provide a connection between the output and VDD anytime the ...
A combinational logic expression is a mathematical formula which is to be interpreted using the laws of Boolean algebra: given the expression a + b, for example, we can compute its truth value for any given values of a and b; we can also evaluate relationships such as a + b = c. A logic gate computes a specific Boolean function, such as (a + b)’.
What is a combinational circuit? Output depends only on current inputs. No memory. Example: Circuit that adds to binary numbers. Digital Circuits Operate on Binary Values. Typically consider only two discrete values: 1’s and 0’s. 1, TRUE, HIGH. 0, FALSE, LOW. 1 and 0 can be represented by anything (typically voltage)
Schematic: A drawing of interconnected gates. Net: Wires at the same voltage (electrically connected) Netlist: A list of all the devices and connections in a schematic. Fan-in: The # of inputs to a gate. Fan-out: The # of loads the gate drives. 4.
