| A | B |
|---|
| fetch | Microprocessor gets a software instruction from memory telling it what to do with the data. |
| decode | Microprocessor determines what the instruction means. |
| execute | microprocessor performs the instruction. |
| transistor | A type of switch that contains no moving parts and uses electricity to turn itself on and off. |
| micron | A unit of measure that is one millionth of a meter. |
| clean room | Place where chips are manufactured, designed to protect chips from dust. |
| 500 million | There are more than ____ transistors in a modern microprocessor. |
| silicon | Wafers cut from a ____ ingot are a rpimary ingredient of microprocessors. |
| chemicals and gases | ____ are used throughout the chip-manufacturing process. |
| metals | ___ are used to conduct the electricity throughout the microprocessor. |
| gold | ____ is used to connect the actual chip to its packaging. |
| ultraviolet light | ____ is used to expose patterns on the layers of the microprocessor. |
| masks | ____ used in the chip-making process are like stencils; by covering parts of the chip and exposing other parts to UV light, masks create the various circuit patterns on each layer of microprocessor |
| wafer | A thin, flat piece of semiconductor crystal used in the manufacture of microprocessors and integrated circuits. |
| layer | In the first step of making a circuit on a wafer, the first ____ of silicon dioxide is grown by exposing the wafer to extreme heat and gas. |
| photoresist | In the second step of making a circuit on a wafer, the wafer is coated with a substance called _____. |
| protects | In the third step of making a circuit on a wafer, UV light is passed through a patterned mask onto the silicon wafer; the mask ____ parts of the wafer from the light; the photoresist becomes gooey. |
| etched | In the fourth step of making a circuit on a wafer, the gooey photoresist is now dissolved by a solvent, revealing a pattern which will be ____ away by chemicals. |
| ion implantation | In the fifth step of making a circuit on a wafer, the exposed areas of the silicon wafer are bombarded with various chemical impurities called ions; ____ ____ alters the way silicon in these areas conducts electricity. |
| windows | In the sixth step of making a circuit on a wafer, the layering and masking processes are repeated, creating ____ that allow for connections to be made between the layers. |
| atoms | In the seventh step of making a circuit on a wafer, ____ of metals are deposited on the wafer, filling the windows. |
