Method and apparatus for in-system redundant array repair on integrated circuits

A method of repairing an integrated circuit, the circuit including a set of memory arrays, a fuse box holding control data to control redundancy logic of the arrays, and a selector for transmitting the control data to the memory arrays, the method comprising the steps:

• at a first time period, transmitting the control data from the fuse box, through the selector and to the memory arrays to control the redundancy logic of the arrays;
• at a second time period, transmitting alternate control data from an alternate source, external to the integrated circuit, through the selector and to the memory arrays to control the redundancy logic of the arrays;
• and
• applying a selector enable signal having first and second states to the selector, including the steps of
• at said first time period, applying the selector enable signal in the first state thereof, to the selector to enable the selector to pass the control data from the fuse box to the memory arrays, and
• at said second time period, applying the selector enable signal in the second state thereof, to the selector to enable the selector to pass the alternate control data from the alternate source and to the memory arrays.