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The use of multiplexing helps explain another aspect of computer architecture: uniform
size of all data objects, including addresses. We will see that data transfers in a
computer each occur over a bus. Furthermore, because the bus multiplexes the transfers
over a fixed number of lines, a data item that exactly matches the bus width can be
transferred in one cycle, but any item that is larger than the bus width requires multiple
cycles. Thus, it makes sense for an architect to choose a single size for the bus width,
the size of a general purpose register, and the size of a data value that the ALU or functional
units use (e.g., the size of an integer or a floating point value). More important,
because addresses are also multiplexed over the bus lines, it makes sense for the architect
to choose the same size for an address as for other data items. The point is:
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