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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
XCR3128XL-10TQ144I		Xilinx	2005+	9	Israel	Request A Quote
XCR3128XL-10TQ144I		Xilinx	-	535	Japan	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2020+	1520	Hong Kong	Request A Quote
XCR3128XL-10TQ144I		Xilinx	-	43	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2021+	3112	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	-	70	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2001+	1000	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	-	1000	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2001+	1100	Japan	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2020+	1773	Japan	Request A Quote
XCR3128XL-10TQ144I		Xilinx	201121+	60	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2021+	972	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2020+	190	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2022+	1000	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2020+	2850	South Korea	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2006+	108	Israel	Request A Quote
XCR3128XL-10TQ144I		Xilinx	-	31	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2022+	7595	Hong Kong	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2022+	1000	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2021+	3040	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	-	10000	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2022+	330	China	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2021+	3000	Hong Kong	Request A Quote
XCR3128XL-10TQ144I		Xilinx	2021+	227	Hong Kong	Request A Quote
XCR3128XL-10TQ144I		Xilinx	-	2	U.S.A.	Request A Quote

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