fan-in

Fan-in is the number of inputs a gate can handle.

A major advantage over the earlier resistor-transistor logic is the increased fan-in.

Fan-in occurs when two or more routes write to the same eventIn.

This was a thousand times more reliable than tubes, ran cooler, and used less power, but had a very low fan-in of three.

Using logic gates with higher fan-in will help reducing the depth of a logic circuit.

For instance the fan-in for the AND gate shown in the figure is 3.

The height thereby is the largest number of logical units with unbounded fan-in on any path from an input to the output.

Physical logic gates with a large fan-in tend to be slower than those with a small fan-in.

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Another limitation of RTL was its limited fan-in: 3 inputs being the limit for many circuit designs, before it completely lost usable noise immunity.

The NC classes are related to the AC classes, which are defined similarly, but with gates having unbounded fan-in.

People who design digital integrated circuits typically insert trees whenever necessary such that the fan-in and fan-out of each and every gate on the chip is between 2 and 10.

They define fan-in of a procedure as the number of local flows into that procedure plus the number of data structures from which that procedure retrieves information.

CMOS logic gate design, fan-in, fan-out, NAND vs NOR design, basic physical design of simple logic gates.

In contrast, TTL circuits, while similarly modular, often require much more careful interfacing, since the limited fanout (and fan-in) require that the loading of each output be carefully considered.

Every problem in ACC can be solved by circuits of depth 2, with AND gates of polylogarithmic fan-in at the inputs, connected to a single gate computing a symmetric function.

This network topology allows for adding extra layers of fan-in as a system grows, and batching messages before sending them between datacenters, without having any code that explicitly needs to understand datacenter topology, only a simple configuration.

Henry and Kafura's complexity value is defined as "the procedure length multiplied by the square of fan-in multiplied by fan-out" (Length x(fan-in x fan-out)2).

The depth is the maximal number of gates on any path from the root to a leaf, and the weft is the maximal number of gates of fan-in at least three on any path from the root to a leaf.

But (in what Agrawal et al. called "a curious, often observed fact") all sets known to be NP-complete at that time could be proved complete using the stronger notion of AC many-one reductions: that is, reductions that can be computed by circuits of polynomial size, constant depth, and unbounded fan-in.