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dft io pad
When I use DFT compiler to insert_scan i find if i insert_scan at chip level, I have to write a "gate level" pad model. For DFT compiler can't deal with pad correctly. The pad model i wrote contains only some AND BUF gates. But i found still sometimes DFT compiler can't understand it...
INIT attribute is used to generate LUT equation
here's a example from xilinx
Test case for using INIT attribute:
-- 4 input comparator with chip select example.
-- Given the signal DATA_IN (3 downto 0), the LUT equation is as follows:
~DATA_IN(3) * ~DATA_IN(2) *...