Patent ID: 7287204

Claim:
A method for testing memory units having storage locations, comprising: forming for the storage locations a first item of test information according to a variable parameter assigned to the respective storage location and according to the content of the respective storage location, wherein in the first phase of a test cycle at each storage location of the memory unit; loading predetermined first output data and predetermined second output data into a FIFO; reading and transferring an original content of the storage location to a register at the output of the memory unit; transferring the read original content from the register to the FIFO and writing the first output data of the FIFO into the storage location; reading again the content of the storage location, transferring the content to the register at the output of the memory unit and comparing the content with the first output data of the FIFO; transferring the read content from the register to the FIFO and writing the second output data of the FIFO into the storage location; reading again the content of the storage location, transferring the content to the register at the output of the memory unit and comparing the content with the second output data; and transferring the read content from the register to the FIFO and writing the original content from the FIFO into the storage location.