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Every memory has three sets of wires connected to it:
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data wires
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the wires containing the actual data
value read or written
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address wires
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the wires containing the address in binary
of the desired word; this is the input to
the address decoder, and causes one of the
word-select wires to have 1 on it
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control wires
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the wires that select read or write and
whether or not this memory is to respond
to the read or write wire
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