Methods for operating a semiconductor memory array including dynamically adjusting control line voltages based on one or more array conditions associated with the semiconductor memory array are described. The support has at least a latch hole. The blade is mounted pivotally in the cavity and has a proximal end, two opposite edge and two wheels. Alternatively, the output of an asymmetrical clock divider may be delayed by one input clock signal half-cycle and combined with the original asymmetrical signal to form a symmetrical divided clock signal.