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Programmable logic block having lookup table with partial output signal driving carry multiplexer
Programmable logic block having lookup table with partial output signal driving carry multiplexer
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机译:具有具有部分输出信号驱动进位多路复用器的查找表的可编程逻辑块
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摘要
A programmable logic block provides to a carry chain multiplexer an output signal representing a partial output signal from a programmable lookup table (LUT), e.g., an output signal having a value that depends upon fewer than all of the data input signals of the LUT. In one embodiment, a first LUT output terminal provides a signal that depends upon fewer than all of the LUT data input signals, and the second LUT output terminal provides a signal that depends upon all of the LUT data input signals. In another embodiment, the first output signal depends upon X of the input signals and the second output signal depends upon Y of the input signals, X and Y being positive integers, X being less than Y. The first LUT output terminal drives a data input terminal, and the second LUT output terminal drives a select input terminal, of the carry chain multiplexer.
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