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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
XCR3256XL-10TQG144I		Xilinx	-	5569	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2013+	3250	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	-	2086	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	201049+	34	Poland	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2021+	2500	Japan	Request A Quote
XCR3256XL-10TQG144I		Xilinx	201049+	3588	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2021+	2024	Hong Kong	Request A Quote
XCR3256XL10TQG144I		Xilinx	-	33	Germany	Request A Quote
XCR3256XL-10TQG144I		Xilinx	-	950	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	-	9	U.S.A.	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2020+	2850	South Korea	Request A Quote
XCR3256XL-10TQG144I		Xilinx	-	350	Hong Kong	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2022+	900	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2020+	342	Hong Kong	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2023+	5000	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	-	900	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	-	20358	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2020+	10	China	Request A Quote
XCR3256XL10TQG144I		Xilinx	-	285	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2020+	2803	Japan	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2021+	566	South Korea	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2021+	566	U.S.A.	Request A Quote
XCR3256XL-10TQG144I		Xilinx	-	100	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2001+	2000	China	Request A Quote
XCR3256XL-10TQG144I		Xilinx	2017	2549	China	Request A Quote

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