Built-in memory repair method that is based on the fuse download state machine and fuse burned state machine

摘要

Memory repair circuit for repairing a defective one or more internal memory includes a state machine circuit coupled to the fuse and fuse register at least one register. The state machine circuit, receives status information on a failure of one or more of (i) the internal memory, it is determined whether memory repairable based on (ii) status information, (iii) the memory is to be repairable When it is considered, baked to fuse register an address stores the address corresponding to the defective memory cells of the memory, using a voltage source which is supplied to (iv) a memory repair circuit, corresponding to the defective memory cell, and (v and a state machine circuit that implements the state machine having a first operative to verify that the address corresponding to) the defective memory cell is burned into the fuse register. Furthermore, it downloads the service at least one register associated with the internal memory information stored in the fuse at least one register (i), and state machine circuits corresponding to the defective memory portion of the internal memory is (ii) Address Once received by the circuit, to implement the state machine of second operative to reroute the repair register at least one access to the defective memory portion.