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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-10TQ100C		Xilinx	2021+	1349	China	Request A Quote
XC9572XL-10TQ100C		Xilinx	200445	25	U.S.A.	Request A Quote
XC9572XL-10VQG44I		Xilinx	2016+	160	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2019+	3000	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2019+	5760	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2020+	40000	U.S.A.	Request A Quote
XC9572XL-10VQG44I		Xilinx	2024	5444	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	1901+	9794	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	-	2	U.S.A.	Request A Quote
XC9572XL-10VQG44I		Xilinx	1901	1856	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2020+	40000	South Korea	Request A Quote
XC9572XL-10VQG44I		Xilinx	2021+	566	South Korea	Request A Quote
XC9572XL-10VQG44I		Xilinx	2020+	8542	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	-	22888	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2023+	4820	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	201817+	120	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2019+	8000	Hong Kong	Request A Quote
XC9572XL10VQG44I		Xilinx	2015+	1280	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	200713	109	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2024+	5000	Hong Kong	Request A Quote
XC9572XL-10VQG44I		Xilinx	2019+	2000	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2020+	1629	Hong Kong	Request A Quote
XC9572XL-10VQG44I		Xilinx	2022+	8000	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	2022+	22888	China	Request A Quote
XC9572XL-10VQG44I		Xilinx	-	14287	China	Request A Quote

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