A bit line pre-charge circuit for a dynamic random access memory uses a charge sharing scheme. In the joint arrangement, a mechanism for limiting the rotation of the leg relative to the holding body is provided in order to protect a cable passed through the leg and holding body against excessive twisting. The communication system routes the user communications over the second link if the delay variation exceeds the maximum threshold. The semiconductor light emitting element preferably has a emission wavelength near 330 nm, and preferably uses BGaN in its light emitting layer.