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Programmable Devices

A programmable logic device (PLD) is an electronic component used to build reconfigurable digital circuits. Unlike a logic gate, which has a fixed function, a PLD has an undefined function at the time of manufacture. Before the PLD can be used in a circuit it must be programmed, that is, reconfigured. Before PLDs were invented, read-only memory (ROM) chips were used to create arbitrary combinational logic functions of a number of inputs. Consider a ROM with m inputs (the address lines) and n outputs (the data lines). When used as a memory, the ROM contains 2m words of n bits each. Now imagine that the inputs are driven not by an m-bit address, but by m independent logic signals. Theoretically, there are 22m possible Boolean functions of these m input signals. By Boolean function in this context is meant a single function that maps each of the 2m possible combinations of the m Boolean inputs to a single Boolean output. There are 22m possible distinct ways to map each of 2m inputs to a Boolean value, which explains why there are 22m such Boolean functions of m inputs. Now, consider that each of the n output pins acts, independently, as a logic device that is specially selected to sample just one of the possible 22m such functions. At any given time, only one of the 2m possible input values can be present on the ROM, but over time, as the input values span their full possible domain, each output pin will map out its particular function of the 2m possible input values, from among the 22m possible such functions. Note that the structure of the ROM allows just n of the 22m possible such Boolean functions to be produced at the output pins. The ROM therefore becomes equivalent to n separate logic circuits, each of which generates a chosen function of the m inputs.

Programmable Logic > Programmable Devices > CPLD

Part No.	DS	Manufacturer	D/C	Qty	Region	Action
XC9572XL-10VQG44I		Xilinx	-	1000	Hong Kong	Request A Quote
XC9572XL-10VQG44I		Xilinx	2022+	7595	Hong Kong	Request A Quote
XC9572XL-10VQG44I		Xilinx	-	4470	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2021+	566	South Korea	Request A Quote
XC9572XL-10VQG44I		Xilinx	2020+	40000	South Korea	Request A Quote
XC9572XL-10VQG44I		Xilinx	2020+	7288	Singapore	Request A Quote
XC9572XL-10VQG44I		Xilinx	2022+	22000	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	-	1	U.S.A.	Request A Quote
XC9572XL-10VQG44I		Xilinx	2020+	2850	South Korea	Request A Quote
XC9572XL-10VQG44I		Xilinx	1905+	97	Poland	Request A Quote
XC9572XL-10VQG44I		Xilinx	2009+	192	Hong Kong	Request A Quote
XC9572XL-10VQG44I		Xilinx	-	5000	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2022+	1303	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	-	10000	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2022+	1000	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2021+	3712	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2022+	5280	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2022+	22888	Hong Kong	Request A Quote
XC9572XL-10VQG44I		Xilinx	2019+	1	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	-	22899	China	Request A Quote
XC9572XL10VQG44I		Xilinx	-	135	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	1925+	590	Taiwan	Request A Quote
XC9572XL-10VQG44I		Xilinx	-	1000	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	201817+	120	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2021+	13291	China	Request A Quote

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