The Essentials ofComputer(computer) 450

The Essentials ofComputer(computer) 450 - directed to the...

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directed to the upper output and the lower input is directed to the lower output. More simply, the input is directed through the switch. In the cross state, the upper input is directed to the lower output, and the lower input is directed to the upper output. In upper broadcast , the upper input is broadcast to both the upper and lower outputs. In lower broadcast , the lower input is broadcast to both the upper and lower outputs. The through and cross states are the ones relevant to interconnection networks. The most advanced class of networks, multistage interconnection networks , is built using 2 2 switches. The idea is to incorporate stages of switches, typically with processors on one side and memories on the other, with a series of switching elements as the interior nodes. These switches dynamically configure themselves to allow a path from any given processor to any given memory. The number of switches and the number of stages contribute to the path length of each communi- cation channel. A slight delay may occur as the switch determines the configura-
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