Function key_tables_kernel 

pub fn key_tables_kernel<const KT: usize>(
    _cr: ClockReset,
    i: KeyTablesIn<KT>,
    q: KeyTablesQ<KT>,
) -> ([Niels17; 2], KeyTablesD<KT>)
where
    W<KT>: BitWidth,

Wiring for KeyTables.