Selecting circuits for columns of an array of memory cells are used to hold read data or write data of the memory cells. The memory cells may be multistate memory cells. There is a shift register chain, having a stage for columns of the array. A strobe pulse is shifted through this shift register. The...http://www.google.com/patents/US7768841?utm_source=gb-gplus-sharePatent US7768841 - Dynamic column block selection
