Composing memory

• Memory size needed often differs from size of readily available memories.

• When available memory is larger, simply ignore unneeded high-order address bits and higher data lines

• When available memory is smaller, compose several smaller memories into one larger memory.
– Connect side-by-side to increase width of words.
– Connect top to bottom to increase number of words.

• added high-order address line selects smaller memory containing desired word using a decoder.
– Combine techniques to increase number and width of words.










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