example the fuse unit cells are arranged in m rows and n columns the rows are along the x direction and the columns are along the y direction the fuse macro structure may be employed for storing non volatile information for example a fuse unit cell corresponds to a bit of data stored in an alternative embodiment the fuse macro structure may be used for storing address information for redundancy activation or defect replacement providing a fuse macro structure for other purposes may also useful the fuse macro structure includes row and column decoders 270 and 280 to facilitate accessing the fuse unit cells an address addr is used to determine which fuse unit cell to access the address for example includes a row portion addr row and a column portion addr col the row address is provided to the row decoder and the column address is provided to the column decoder based on the addr the row decoder selects a row to access and the column decoder selects a column to access the number of bits in addr should be sufficient to address the number of fuse unit cells each fuse unit cell corresponds to a bit in the case of a 1024 bit fuse macro structure a 10 bit addr is used if the 1024 bit fuse macro structure is configured as a 64 u00d7 16 array the addr row is 6 bits long while the addr col is 4 bits long other configurations of fuse macro structures may also.