Electronic digital logic circuitry – Interface – Current driving
Patent
1998-09-11
2000-08-15
Tokar, Michael
Electronic digital logic circuitry
Interface
Current driving
326 91, 326 39, 326 9, 326 10, 326 11, 326 12, 326 13, 326 14, 326 37, 326 40, 326 41, G06F 738, H03K 190175
Patent
active
061042110
ABSTRACT:
A radiation-tolerant logic circuit includes three similarly configured SRAM-based PLDs. These PLDs work in parallel to provide identical logic functions. To guard against data corruption that can result from radiation-induced upsets, the logic circuit includes a state-comparison circuit that periodically performs a bitwise comparison of the configuration and user data from each of the PLDs; if a bit from one PLD differs from the corresponding bit from the others, the state-comparison circuit sets a flag that indicates that the differing PLD is in error. The erroneous PLD is then reprogrammed using error-free state data. In one embodiment, the error-free state data is read from an error-free PLD.
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"The Programmable Logic Data Book", 1998, available from Xilinx, Inc., 2100 Logic Drive, San Jose, California 95124, pp. 4-56 to 4-59.
Wolfgang Hoflich, Applications Note, "Using the XC4000 Readback Capability", XAPP 015.000, 1993 pp. 8-37 to 8-44.
Behiel Arthur J.
Harms Jeanette S.
Tan Vibol
Tokar Michael
Xilinx , Inc.
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