Xilinx, Inc.

William R Troxel

Jay T Young

Walter A Manaker, Jr

Carl M Stern

Eric Ford Dellinger

David Wayne Bennett

Sridhar Krishnamurthy

Andrew W Lai

Jeffrey V Lindholm

Randy J Simmons

Vincent L Tong

Teymour M Mansour

Methods of optimizing the use of routing resources in programmable logic devices (PLDs) to minimize test time. A set of routing resources is identified that are not used in most designs, and a device model is provided to the user that prevents the use of these resources. Because the routing resources will never be used, they need not be tested by the PLD manufacturer, significantly reducing the test time. For example, each PLD within a PLD family is typically designed using a different number of similar tiles. Thus, smaller PLDs in the family include an unnecessarily large number of routing resources. These excessive routing resources can be disabled during implementation of a design. In another example, each tile along the edges of an array includes routing resources designed primarily to provide access to tiles that are not present. These redundant routing resources can be disabled during implementation of a design.

Methods of resource optimization in programmable logic devices to reduce test time

A device independent, frequency driven layout system and method for field programmable gate arrays ('FPGA') which allow for a circuit designer to specify the desired operating frequencies of clock signals in a given design to the automatic layout system to generate, if possible, a physical FPGA layout which will allow the targeted FPGA device to operate at the specified frequencies. Actual net, path and skew requirements are automatically generated and fed to the place and route tools. The system and method of the present invention evaluates the frequency constraints, determines what delay ranges are acceptable for each electrical connection and targets those ranges throughout the layout.

Frequency driven layout and method for field programmable gate arrays

Frequency driven layout system and method for field programmable gate

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Longmont, CO, United States of America

William R Troxel