Patent ID: 7884640

Claim:
A programmable logic integrated circuit device adapted to enter a low-power mode, the device comprising: first and second voltage supply distribution lines each adapted to couple to an external voltage source; a first transistor having a control terminal and first and second conductive terminals, the first conductive terminal coupled to the second supply distribution line; a programmable logic device core coupled to the control circuit, and including a first region comprising a plurality of logic modules and having a first supply terminal coupled to the first supply distribution line, a second supply terminal coupled to the second supply distribution line, and a second region comprising a plurality of logic modules and having a third supply terminal coupled to the first supply distribution line and a fourth supply terminal coupled to the second conductive terminal of the transistor; and a control circuit coupled to drive the control terminal of the first transistor, the control circuit further coupled to send at least one signal to the first region of the programmable logic device core and to receive at least one signal from the second region of the programmable logic device core.