Are all the antifuses checked by the Activator?
Every fuse being programmed is checked during the programming sequence. Programming pulses are applied across each fuse individually until current is sensed through the fuse. Once current is sensed, additional “soak” pulses are applied to ensure the fuse is programmed. After soak pulses are applied, the programming voltage is lowered and current is again sensed through the fuse, to verify the sensed current is through the programmed fuse and not due to leakage elsewhere in the device (check 6 test). Each fuse is checked individually as the array is programmed. After all array fuses are programmed, a series of additional “net shorts” tests are performed to verify that no additional fuses have been programmed. Checksum fuses are programmed after the net shorts tests are performed.
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