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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

부품 번호	DS	제조 업체	D/C	수량	지역	액션
XC2C256-7CPG132C		Xilinx	-	5527	China	견적 요청서
XC2C256-7CPG132C		Xilinx	2021+	200	Japan	견적 요청서
XC2C256-7CPG132C		Xilinx	2022+	7595	Hong Kong	견적 요청서
XC2C256-7CPG132C		Xilinx	2020+	2850	South Korea	견적 요청서
XC2C256-7CPG132C		Xilinx	201521	3	Germany	견적 요청서
XC2C256-7CPG132C		Xilinx	-	482	China	견적 요청서
XC2C256-7CPG132C		Xilinx	-	356	China	견적 요청서
XC2C256-7CPG132C		Xilinx	2021+	12564	China	견적 요청서
XC2C256-7CPG132C		Xilinx	2020+	442	Hong Kong	견적 요청서
XC2C256-7CPG132C		Xilinx	2021+	2156	China	견적 요청서
XC2C256-7CPG132C		Xilinx	2022+	5000	South Korea	견적 요청서
XC2C256-7CPG132C		Xilinx	2022+	5000	U.S.A.	견적 요청서
XC2C256-7CPG132C		Xilinx	-	182	China	견적 요청서
XC2C256-7CPG132C		Xilinx	2021+	12564	China	견적 요청서
XC2C256-7CPG132C		Xilinx	201829+	456	China	견적 요청서
XC2C256-7CPG132C		Xilinx	-	267	United Kingdom	견적 요청서
XC2C256-7CPG132C		Xilinx	2021+	2000	Hong Kong	견적 요청서
XC2C256-7CPG132C		Xilinx	2021+	2000	Singapore	견적 요청서
XC2C256-7CPG132C		Xilinx	-	1400	China	견적 요청서
XC2C256-7CPG132C		Xilinx	2022+	1000	Hong Kong	견적 요청서
XC2C256-7CPG132C		Xilinx	201725+	67	Hong Kong	견적 요청서
XC2C256-7CPG132C		Xilinx	2022+	5000	China	견적 요청서
XC2C256-7CPG132C		Xilinx	-	2560	China	견적 요청서
XC2C256-7CPG132C		Xilinx	-	6800	China	견적 요청서
XC2C256-7CPG132C		Xilinx	-	50	China	견적 요청서

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