Programmable logic device with redundant circuitry
February 22, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re33521 Embossed decorative facing panel Programmable arrays Redundant rows in integrated circuit memories Parallel-shift error reconfiguration Semiconductor memory with redundant column circuitry Configurable logic element Semiconductor device with redundancy circuit and means for activating same Logic redundancy circuit scheme Redundancy system with distributed mapping InventorsApplicationNo. 199620 filed on 02/22/1994US Classes:326/13, With field effect-transistor326/39, Array (e.g., PLA, PAL, PLD, etc.)326/44Field effect transistorExaminersPrimary: Hudspeth, DavidAttorney, Agent or FirmInternational ClassH03K 019/177AbstractA programmable logic device is provided that has redundant circuitry. When a portion of the programmable logic device circuitry is found to be defective, the redundant circuitry is switched into use in place of the defective circuitry by programming appropriate portions of the circuitry of the programmable logic device. The programmable logic device is arranged in rows and columns of programmable logic containing logic array blocks, which a user selectively configures by loading programming data into vertical and horizontal programming blocks. Programming blocks are used to program the logic array blocks and various associated logic circuitry. When the redundant circuitry is switched into place, the programming data is redirected to the appropriate programming blocks, so that the device functions identically, regardless of whether or not the redundant circuitry is used.Other References
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