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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 > FPGA

Part No.	DS	Manufacturer	D/C	Qty	Region	Action
XC3S500E-4PQG208I		Xilinx	2008+	372	Singapore	Request A Quote
XC3S500E-4PQG208I		Xilinx	202237+	16512	Japan	Request A Quote
XC3S500E-4PQG208I		Xilinx	2022+	240	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	2021+	1200	Hong Kong	Request A Quote
XC3S500E-4PQG208I		Xilinx	2024+	2120	Japan	Request A Quote
XC3S500E-4PQG208I		Xilinx	2008+	7500	Japan	Request A Quote
XC3S500E-4PQG208I		Xilinx	2021+	2180	Hong Kong	Request A Quote
XC3S500E-4PQG208I		Xilinx	2021+	8386	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	2024	2000	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	202137	2082	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	2021+	4240	China	Request A Quote
XC3S500E4PQG208I		Xilinx	-	100	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	2024+	12158	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	202142+	3150	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	2015+	1280	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	2022+	420	Hong Kong	Request A Quote
XC3S500E-4PQG208I		Xilinx	2022+	556	Singapore	Request A Quote
XC3S500E-4PQG208I		Xilinx	2021+	3450	Singapore	Request A Quote
XC3S500E-4PQG208I		Xilinx	2022+	8800	Hong Kong	Request A Quote
XC3S500E-4PQG208I		Xilinx	-	100	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	2022+	5000	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	2021+	300	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	202137	2082	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	2013+	5	China	Request A Quote
XC3S500E-4PQG208I		Xilinx	2023+	2500	Hong Kong	Request A Quote

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