The present invention relates to a method for the determination of the presence and amount of DNA in a sample. The tray contains at least one recess adapted to retain an oxygen or moisture scavenger pack . Both an SER and a switching speed performance characteristic can be tailored by suitable placement of the charge traps. The refresh control circuit has a refresh address generation circuit which generates a refresh address for a memory macro having the largest capacity, supplies the refresh address to the memory macro, and supplies given top bits of the refresh address as a refresh address to another memory macro having a smaller capacity. The context buffers are refilled in an order defined by the respective priorities of the refill requests. The basic technique can be utilized to determine an anneal time and anneal duration for annealing sichrome resistors to precisely adjust the sheet resistance or TCR thereof.