Abstract: A unitary vent chute and insulation dam body for providing ventilation to an open attic space in a building structure that has a pitched roof and preventing insulating material, particularly loose fill insulation, from blocking that ventilation. The body, formed from a flexible polyolefin foam, includes surface channels, internal conduits or both that promote air flow between a soffit vent and an attic vent in the building structure. The body is flexible enough to bend without breaking, yet stiff enough that one end of the body rests against a roof deck without closing off the surface channels or grooves when the other end is fastened near the top of the structure exterior wall. The body is bent and inserted between adjacent rafters either before or after the end is fastened to the structure exterior wall.

Abstract: A programmable logic device having redundant sets of logic blocks which are capable of being enabled or disabled. The programmable logic device includes a plurality of sets of logic blocks, a plurality of routing resources and a programming circuit. Good logic blocks are enabled and fully operational when programmed. Nonfunctional logic blocks are disabled, powered off and invisible to the programming software. Each set of logic blocks has a corresponding routing resource. The routing resource corresponding to an enabled set of logic blocks is capable of being configured to provide input and output data paths for the enabled set of logic blocks. The routing resource corresponding to a disabled set of logic blocks is capable of being configured to bypass the disabled set of the logic blocks. The programming circuit stores the configuration data for the routing resources and is capable of providing the configuration data to a routing resource that corresponds to an enabled set of logic blocks.

Abstract: The present invention provides a method and apparatus for high yield improvements in programmable logic devices using redundancy. The present invention concerns a programmable logic device comprising a plurality of routings lines coupled to a plurality of logic blocks when programmed. During programming, a path is routed through the routing lines by programming the selected programmable elements. The selected programmable elements are located at each interconnect point between at least two routing lines or two segments of a routing lines along the path. The programmable elements include at least two interconnect circuits coupled in parallel. The programmable element is successfully programmed when at least one of the interconnect circuits is functional after programming.