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For this purpose, the memory modules or memory chips have selection inputs, usually referred to as chip select pin (CS) or chip enable pin (CE) pin. These inputs often have a negative logic function ({{overline|CS}} or {{overline|CE}}), i. H. with an adjacent logical zero (voltage level low) is selected.
The address decoder uses the different combinatorial logic to place the memory modules or chips in the address space of a processor. The memory modules often have a smaller capacity than the address space. In most cases, several modules can be used, even if they are completely identical in structure. It must be ensured that they differ in the address range.
==References==
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