Memory margin management

摘要

A method for testing and correcting a memory system is described. The method includes selecting a target memory unit of the memory system having a timing margin in response to a trigger to start a timing margin measurement. The stored data in the target memory unit is moved to a spare memory unit. The memory system performs reads and writes of user data from the spare memory unit while measuring the target memory unit. The timing margins of the target memory unit are measured. The reliability of the measured timing margins of the target memory unit based on a timing margin profile is determined.

主权项

1. A method for testing and correcting a memory system comprising:
selecting a target memory unit of the memory system in response to a trigger to start a timing margin measurement; moving data stored in the target memory unit to a spare memory unit; steering reads from and writes of data to the spare memory unit instead of the target memory while performing two or more timing measurements of the target memory unit, wherein the two or more timing measurements of the target memory unit include a measurement of a setup margin and a measurement of a hold margin; and determining whether a timing measurement has degraded beyond a threshold value by comparing the timing margin measurements of the target memory unit with a timing margin profile measurement.