According to example embodiments, a logic device includes a first functional block configured to perform a first operation according to first operation information and a second operation according to second operation information, and a second functional block configured to perform a third operation according to the first operation information and a fourth operation according to the second operation information. The first functional block is configured to receive configuration information, to select one of the first operation information and the second operation information based on the configuration information, and to perform the first or second operation based on the selected first or second operation information. The second functional block is configured to receive the configuration information, to select one of the first operation information and the second operation information based on the configuration information, and to perform the third or fourth operation based on the selected first or second operation information.