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A NOR gate is a logic gate which gives a positive output only when both inputs are negative. For example, the first embedded systemthe Apollo Guidance Computerwas built exclusively from NOR gates, about 5, in total for the later versions. Today, integrated circuits are not constructed exclusively from a single type of gate.
Instead, EDA tools are used to convert the description of a logical circuit to a netlist of complex gates standard cells or transistors full custom approach. This is made by joining the inputs of a NOR gate. An AND gate gives a 1 output when both inputs are 1. This construction entails a propagation delay three times that of a single NOR gate. This construction uses five gates instead of four.
This construction entails a propagation delay three times that of a single NOR gate and uses five gates. Alternatively, the 4-gate version of the XNOR gate can be used with an inverter. This construction has a propagation delay four times instead of three times that of a single NOR gate.
From Wikipedia, the free encyclopedia. For logic gates in general, see Logic gate. This article Reverse Song - Noisesurfer - Adsl (File, Album) additional citations for verification.
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