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Incomputing, anaperture is a portion ofphysical address space (i.e.physical memory) that is associated with a particularperipheral device or amemory unit. Apertures may reach external devices such asROM orRAM chips, or internal memory on theCPU itself.
Typically, a memory device attached to a computer accepts addresses starting at zero, and so a system with more than one such device would have ambiguous addressing. To resolve this, the memory logic will contain several apertureselectors, each containing a range selector and an interface to one of the memory devices.
The set of selector address ranges of the apertures are disjoint. When the CPU presents a physical address within the range recognized by an aperture, the aperture unit routes the request (with the address remapped to a zero base) to the attached device. Thus, apertures form a layer ofaddress translation below the level of the usual virtual-to-physical mapping.
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