1. A data processing system, the data processing system comprising: a data detector circuit operable to apply a data detection algorithm to a data input to yield a detected output; a data decoder circuit operable to apply a data decode algorithm to a data set derived from the detected output to yield a decoded output; and a power usage control circuit operable to force a defined number of global iterations to be applied to the data input by the data detector circuit and the data decoder circuit regardless of convergence of the data decode algorithm.