1. A method of hot-plugging a semiconductor memory segment into a system, comprising the acts of: operating a memory system in a non-redundant mode, wherein the memory system comprises a plurality of memory segments; inserting a replacement memory segment into the memory system during operation; initiating a first refresh request to each of the plurality of memory segments and the replacement segment; waiting a number of clock cycles after initiating the first refresh request; initiating a second refresh request to each of the plurality of memory segments and the replacement memory segment; and operating the plurality of memory segments and the replacement memory segment in a redundant mode after the second refresh request.