Microprocessor components. Light micrograph of an Intel Pentium microprocessor's clock driver, code cache and instruction fetch units. The clock driver regulates all the internal operations by the central processing unit (CPU). The cache memory (SRAM) stores data so that future requests can be served faster. In the instruction fetch unit the instruction is fetched from the memory address. The chip was fabricated by photolithography, using several overlapping metalization layers and vertical contacts to interconnect them in a mono-crystal silicon wafer, which serves as the substrate. Magnification: x90, when printed 10 centimetres wide.
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