Data processing device with a memory location in which data is stored according to a WOM code

A data processing device comprising

• a memory location for storing a codeword for encoding successive data values according to a WOM code;
• a feasibility detector arranged to generate feasibility signals, each for a respective update to a data word encoded in the memory location, each feasibility signal indicating whether, given the current value in the memory location, the update is feasible;
• an input for receiving a new data value;
• a two-bit update detection circuit arranged to bring together pairs of selected ones of the feasibility signals, each pair for a respective first and second one of the updates to the memory location, selection of the feasibility signals in the pair being controlled dependent on the new generation so as to bring together feasibility signals selected so that the first and second update of the pair executed together update a current value of the codeword in the memory location to a next value encoding the new data value, the two bit update detection circuit detecting whether both the first and second feasibility signal of the pair indicate feasibility;
• a selection circuit for selecting one of the pairs of signals, for which both the first and second signal indicate feasibility with the current value;
• an update circuit triggered by the selection circuit to execute the first and second update in the memory location according to the selected pair.