There is provided an error rate monitor incorporating a counter which is incremented as errors are detected in a data stream passing through an interface unit connected to the counter. Circuits and methods for changing a page length of a semiconductor device enable selective activation of one or more corresponding wordlines of memory cell array blocks of a memory cell array to thereby change the page length according to a specified operational mode. An average size of the columns of the fine columnar structure of the second metal layer in a column width direction is larger than an average size of the columns of the fine columnar structure of the first metal layer in a column width direction. Expandable bow spring centralizer 8 may grip the expandable pipe string 80 when in the collapsed configuration to eliminate the need for a stop collar. The capacitor has a leakage path to a voltage supply rail VDD that charges the capacitor back high after a time, such as ten to one hundred cycles, of the dynamic bus being quiet. A configuration bundle that includes configuration data, software revision level and a list of system updates is used to recover the device’s operation state.