The Essentials ofComputer(computer) 451

The Essentials ofComputer(computer) 451 - Property Bus...

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It is interesting to note that configuring the switches is not really as difficult as it might seem. The binary representation of the destination module can be used to program the switches as the message travels the network. Using one bit of the destination address for each stage, each switch can be programmed based on the value of that bit. If the bit is a 0, the input is routed to the upper output. If the bit is a 1, the input is routed to the lower output. For example, suppose CPU 00 wishes to communicate with Memory Module 01. We can use the first bit of the destination (0) to set Switch 1A to through (which routes the input to the upper output), and the second bit (1) to set Switch 2A to cross (which routes the input to the lower output). If CPU 11 wishes to communicate with Memory Module 00, we would set Switch 1B to cross , and Switch 2A to cross (since both inputs must be routed to the upper outputs). Another interesting method for determining the switch setting is to compare the corresponding bits of the source and destination. If the bits are equal, the
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