An integrated circuit containing memory includes IEEE 1149.1 (JTAG)
controlled self-repair system that permits permanent repair of the memory
after the integrated circuit has been packaged. The JTAG controlled
self-repair system allows a user to direct circuitry to blow fuses using
an externally supplied voltage to electrically couple or isolate
components to permanently repair a memory location with JTAG standard TMS
and TCK signals. The system may optionally sequentially repair more than
one memory location using a repair sequencer.