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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 many integrated
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state, so other chips can drive those signals. When the chip select pin is held in the active state, the chip or device assumes that any input changes it "hears" are meant for it, and responds as if it is the only chip on the bus. Because the other chips have their chip select pins in the inactive
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When the chip select pin is held in the inactive state, the chip or device is "deaf", and pays no heed to changes in the state of its other input pins; it holds its outputs in the
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with a master and three slave select lines. Note that all four chips share the SCLK, MISO, and MOSI lines but each slave has its own slave select.
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state, their outputs are high impedance, allowing the single selected chip to drive its outputs.
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CS may also affect a power consumption or serve as cycle control in certain circuits (such as
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pins on the device to the internal circuitry of that device.
219:. Springer Science & Business Media. pp. 249–.
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192:. Springer Science & Business Media. pp. 45–.
189:Guide to Assembly Language Programming in Linux
62:One bus that uses the chip/slave select is the
135:Advanced Microprocessor & Microcontrollers
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112:"Introduction to Serial Peripheral Interface"
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165:. "O'Reilly Media, Inc.". pp. 176–.
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273:This electronics-related article is a
186:Sivarama P. Dandamudi (15 July 2005).
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216:Data Acquisition for Sensor Systems
43:) is the name of a control line in
277:. You can help Knowledge (XXG) by
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110:Kalinsky, David (February 2002).
47:used to select one (or a set) of
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138:. Firewall Media. pp. 94–.
64:Serial Peripheral Interface Bus
159:John Catsoulis (16 May 2005).
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213:H.R. Taylor (14 March 2013).
70:circuits which connects the
241:"chip-enable input | JEDEC"
162:Designing Embedded Hardware
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132:S. K. Venkata Ram (2004).
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66:(SPI bus).
29:Chip select
20:An example
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