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the maximum value of wlen_count can be 14 which is in binary 001110 where 5th bit is always 0 but you are assigning 5th bit of wlen_count to wlast where C_WLEN_COUNT_WIDTH is 6. so, it will be 5th bit of wlen_count but it can never go to 16 where we can get 5th bit as 1 as we are down counting (OR) decrementing wlen_count
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the maximum value of wlen_count can be 14 which is in binary 001110 where 5th bit is always 0 but you are assigning 5th bit of wlen_count to wlast where C_WLEN_COUNT_WIDTH is 6. so, it will be 5th bit of wlen_count but it can never go to 16 where we can get 5th bit as 1 as we are down counting (OR) decrementing wlen_count