Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Chip select (CS) or slave select (SS) is the name of a control line in digital electronics used to select one chip out of several connected to the same computer bus usually utilizing the three-state logic. One bus that uses the chip/slave select is the Serial Peripheral Interface Bus. When an engineer needs to connect several devices to the same set of input wires (e.g., a computer bus), but retain the ability to send and receive data or commands to each device independently of the others on the bus, they can use a chip select. The chip select is a command pin on most ICs which connects the input pins on the device to the internal circuitry of that device, and similarly for the output pins.

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