A programmable logic device having a programmable routing structure that employs non-static memory cells, such as dynamic random access memory cells, to control configurable circuit elements, such as pass-transistors andor MUXes. The shift wire take-up element is rotatably mounted with respect to the base member in first and second rotational directions about a pivot axis. A slits is formed in one of the corners of the upper and lower covers, extending around the respective boss thereof, making up a strap mounting space. The magnets have a polarity oriented at an angle \u03b8 relative to each other.