Xilinx, Inc.

Kusuma Bathala

David P Schultz

Christopher H Kingsley

David Robinson

Paul A Swartz

Wenyi Song

Richard D J Duce

A circuit for routing data in an integrated circuit device is described. The circuit comprises an input/output port; an interface circuit coupled to the input/output port and configured to receive data, the interface circuit comprising a selection circuit enabling the selection of the data and a predetermined value; and a control circuit coupled to control the selection circuit; wherein the control circuit holds the input/output port at the predetermined value during a partial reconfiguration of the integrated circuit device in response to a control signal. A method of configuring a circuit for routing data in an integrated circuit device is also described.

Circuit and method for ensuring a stable IO interface during partial reconfiguration of a reprogrammable integrated circuit device

A system measures propagation delays in any number of test circuits, each having two asynchronous inputs and an output, without using their clock inputs to re-initialize the test circuits during measurement operations. The delay between one of the test circuit's asynchronous inputs and its output is measured by propagating a test signal from the one asynchronous input to the output, and the test circuit is re-initialized using the test circuit's other asynchronous input.

Circuit for measuring signal delays of asynchronous inputs of synchronous elements

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San Jose, CA, United States of America

Kusuma Bathala