| 摘要 |
A 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.
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