def METHOD_NAME():
    '''
    sample:
    "sites": {
        "RAMB18_X0Y50": "FIFO18E1",
        "RAMB18_X0Y51": "RAMB18E1",
        "RAMB36_X0Y25": "RAMBFIFO36E1"
    },
    '''
    for _tile_name, site_name, _site_type in sorted(util.get_roi().gen_sites(
        ['RAMB18E1', 'FIFO18E1'])):
        yield site_name