Calculating the component values is left to the OP. You could make this into a four or five (or any number) input gate by adding more diode pairs. Even though the left side of R3 is high the right side will be pulled low by Q1 because the gate is pulled high by R1. A low - B high: Output also high by same logic as previous example. D4 will pull Q1's gate low turning off Q1 preventing it from pulling OUT low. Line 13 shows the.Ī high - B low: Output will be high because 'A' will feed the OUT terminal through D1. Below figure shows VHDL program for parity generator. Below figure shows the logic circuit implementation. After simplification using K-Maps, we get the following equations for odd and even parity generation circuit. VHDL Code – 4 bit Parity Generator library ieee. VHDL Programming for Combinational Circuits - Learn VLSI Design Concepts starting from Digital System. – Schematic created using How it works A and B low: The output is low since there is no power through D1 or D3 to drive the output high. XOR is one of the trickier ones to implement but it can be done like this. There's are good examples at for each of the standard logic functions.
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