A data bus on an integrated circuit includes a series of selectors arranged in a ring, each selector having an output terminal, an enable terminal, a ring input terminal, and a data input terminal. The ring input terminal receives data from another selector in the ring. The data input terminal receives...http://www.google.de/patents/US5635851?utm_source=gb-gplus-sharePatent US5635851 - Read and writable data bus particularly for programmable logic devices
