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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

型号	DS	厂牌	批号	数量	地区	采购
XCR3256XL-10TQG144I		Xilinx	-	5569	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	2013+	3250	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	-	2086	香港	要求报价
XCR3256XL-10TQG144I		Xilinx	201049+	34	波兰	要求报价
XCR3256XL-10TQG144I		Xilinx	2021+	2500	日本	要求报价
XCR3256XL-10TQG144I		Xilinx	201049+	3588	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	2021+	2024	香港	要求报价
XCR3256XL10TQG144I		Xilinx	-	33	德国	要求报价
XCR3256XL-10TQG144I		Xilinx	-	9	美国	要求报价
XCR3256XL-10TQG144I		Xilinx	2020+	2850	韩国	要求报价
XCR3256XL-10TQG144I		Xilinx	-	350	香港	要求报价
XCR3256XL-10TQG144I		Xilinx	2022+	900	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	2020+	342	香港	要求报价
XCR3256XL-10TQG144I		Xilinx	2024+	3000	香港	要求报价
XCR3256XL-10TQG144I		Xilinx	-	20358	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	2022+	5669	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	2020+	10	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	2020+	2803	日本	要求报价
XCR3256XL-10TQG144I		Xilinx	2021+	566	韩国	要求报价
XCR3256XL-10TQG144I		Xilinx	2021+	566	美国	要求报价
XCR3256XL-10TQG144I		Xilinx	-	100	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	2001+	2000	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	2017	2549	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	2023+	600	中国	要求报价
XCR3256XL-10TQG144I		Xilinx	2022+	3840	中国	要求报价

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