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XCS30XL-4TQ144C
Детали товара: XCS30XL-4TQ144C - Integrated Circuits - Programmable Devices
Категория:
Integrated Circuits
Подкатегория:
Programmable Logic > Programmable Devices
Производитель:
Xilinx
Описание:
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.
Xilinx XCS30XL-4TQ144C на СКЛАДЕ
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