High-performance lookup table circuit based on FGPA
A look-up table and circuit technology, applied to logic circuits using specific components, logic circuits using basic logic circuit components, etc., can solve problems such as rising and falling time asymmetry, reduce the leakage current of the look-up table circuit series, and achieve a solution Rise and fall time asymmetry, increased speed, and improved drive capability
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[0028] Take the 4-input lookup table as an example, such as image 3 , by controlling the switch of the CMOS transmission gate according to the logic value of the four-bit address A1 to A4, so that a conduction path appears from the SRAM terminal to the Q terminal, so that the Q terminal outputs the function value that needs to be realized.
[0029] In principle, 16 SRAM programming points constitute the truth table of any 4-input combinatorial logic. Take the lookup table to implement a 4-input XOR logic as an example. The storage information of 4 input information and 16 programming points is shown in Table 1. When valid A1 to A4 are input, Q will output the value of the corresponding SRAM storage point.
[0030] The function realization process of the lookup table in FPGA is as follows:
[0031] First, in the process of FPGA downloading the bit stream, the 16 storage points of the look-up table used in the design will be written through word lines and bit lines. The st...
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