def propagate_INT_bits_in_column(database, tiles_by_grid, tile_frames_map):
    """ Propigate INT offsets up and down INT columns.

    INT columns appear to be fairly regular, where starting from offset 0,
    INT tiles next to INT tiles increase the word offset by 3.

    """
    int_frames, int_words = localutil.get_entry('INT', 'CLB_IO_CLK')

    propagate_bits_in_column(
        database=database,
        tiles_by_grid=tiles_by_grid,
        tile_type='INT',
        term_b='INT_TERM_B',
        term_t='INT_TERM_T',
        rbrk='INT_RBRK',
        rclk_types=['RCLK_INT_L', 'RCLK_INT_R'],
        tile_frames=int_frames,
        tile_words=int_words,
        tile_frames_map=tile_frames_map)