DRAM ERROR DETECTION, EVALUATION, AND CORRECTION

摘要

This disclosure includes a method for correcting errors on a DRAM having an ECC which includes writing data to a DRAM row, reading data from the DRAM row, detecting errors in the data that cannot be corrected by the DRAM's ECC, determining erasure information for the row, evaluating the errors using the erasure information, and correcting the errors in the data.

主权项

1. A method for correcting errors in a DRAM system, comprising:
writing data to a DRAM using an error correcting code that is capable of correcting a first number of errors, correcting a second number of erasures, and detecting a third number of errors, wherein each of the second and third numbers is larger than the first number; reading data from a row of the DRAM; performing a first processing of the data using an error correcting code decoder; if the data cannot be corrected by the first processing, then:
storing the data;determining locations of weak cells in the row;identifying the weak cells as erasures; andperforming a second processing of the stored data with erasure information using the error correcting code decoder, wherein the erasure information comprises locations of erasures.