Patent ID: 7065687
Filing Date: 2006-06-20
Classification: G11C

Abstract:
1. A method for replacing defective memory cells in a random access memory device of a data processing apparatus, the method which comprises: providing the random access memory device with replacement memory cells, programmable connecting devices, and a control device for controlling replacing defective memory cells using the programmable connecting devices; configuring the data processing apparatus to identify the defective memory cells in an operating state and to store addresses of the defective memory cells; and in the operating state, actuating the control device with a control instruction for replacing the defective memory cells, and assigning the addresses of the defective memory cells to replacement memory cells such that the replacement memory cells replace the defective memory cells, and providing a code specific to the random access memory device for preventing inadvertent, erroneous, or unauthorized use of the control instruction, such that access to the control device is restricted by using a specific service mode.