Patent ID: 7573830

Claim:
An integrated programmable device comprising: a plurality of signal inputs (P 1 , P 2 , P 3 ) and a plurality of switching elements (S 1 , S 2 , S 3 ) each switching element is connected to a different one of said signal inputs (P 1 , P 2 , P 3 ) for selecting under the control of a control circuit ( 15 ) at least one of said signal inputs (P 1 , P 2 , P 3 ) for passing a selected input signal; said control circuit ( 15 ) receiving a channel select signal ( 16 ) indicative of a signal input to be selected and comprising a plurality of enable lines (E 1 , E 2 , E 3 ) for selectively activating corresponding ones of said switching elements (S 1 , S 2 , S 3 ) in accordance with said channel select signal ( 16 ); and a plurality of feedback lines (F 1 , F 2 , F 3 ) each connected to a different one of said enable lines (E 1 , E 2 , E 3 ) for providing a channel feedback indicative of which of said plurality of switching elements (S 1 , S 2 , S 3 ) are enabled.