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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 > Specialized Programmable Logic

型号	DS	厂牌	批号	数量	地区	采购
XCF04SVOG20C		Xilinx	2020+	4237	香港	要求报价
XCF04SVOG20C		Xilinx	-	5223	中国	要求报价
XCF04SVOG20C		Xilinx	2020+	3122	中国	要求报价
XCF04SVOG20C		Xilinx	200638	4	美国	要求报价
XCF04SVOG20C		Xilinx	-	4	印度	要求报价
XCF04SVOG20C		Xilinx	2008	1060	波兰	要求报价
XCF04SVOG20C		Xilinx	-	75	美国	要求报价
XCF04SVOG20C		Xilinx	-	7400	中国	要求报价
XCF04SVOG20C		Xilinx	200748	19	印度	要求报价
XCF04SVOG20C		Xilinx	2019+	50	日本	要求报价
XCF04SVOG20C		Xilinx	-	4000	香港	要求报价
XCF04SVOG20C		Xilinx	201041+	12	波兰	要求报价
XCF04SVOG20C-		Xilinx	-	12	印度	要求报价
XCF04SVOG20C		Xilinx	2016+	45967	香港	要求报价
XCF04S-VOG20C		Xilinx	2020+	2850	韩国	要求报价
XCF04SVOG20C		Xilinx	2024+	8619	日本	要求报价
XCF04SVOG20C		Xilinx	2017+	24	日本	要求报价
XCF04SVOG20C		Xilinx	2017+	24	日本	要求报价
XCF04SVOG20C		Xilinx	2021+	2960	中国	要求报价
XCF04SVOG20C		Xilinx	2020+	3588	中国	要求报价
XCF04SVOG20C		Xilinx	2021+	12073	中国	要求报价
XCF04SVOG20C		Xilinx	-	2960	中国	要求报价
XCF04SVOG20C		Xilinx	2021+	2000	中国	要求报价
XCF04SVOG20C		Xilinx	-	1167	中国	要求报价
XCF04SVOG20C		Xilinx	2020+	2000	中国	要求报价

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