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Cross Bar
The crossbar network is the easiest interconnection network. It has a two dimensional grid of switches. It is a non-blocking network and give connectivity among inputs and outputs and it is possible to connect any of the inputs to any output.
An N * M crossbar network is given in the following Figure 3 (a) and switch connections are given in Figure 3 (b)
A switch positioned at a cross point of a particular row and column. Connects that particular row (input) to column (output).The hardware cost of N*N crossbar switch is proportional to N2. It makes delay equivalent to single switching operation and the routing control mechanism is simple. The crossbar network needs N2 switches for N input and N output network.
I think yes...so if 8259 gives interrupt then it will be serviced instantly but since into pin is left hanging the insr bit will never be set...and so whenever any interrupt occurs
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