A column of a memory includes a first edge cell and at least one memory cell. The first edge cell is located at a first edge of the column and includes a first edge cell reference node and a second edge cell reference node. Each of the at least one memory cells includes a first memory reference node. The first edge cell reference node is coupled to respective first memory reference nodes of the at least one memory cell. The second edge cell reference node serves as second memory reference nodes of the at least one memory cell. Front-end layers of the first edge cell are the same as front-end layers of a memory cell of the at least one memory cell.