Redirecting data from a defective data entry in memory to a redundant data entry prior to data access, and related systems and methods

摘要

Embodiments disclosed include redirecting data from a defective data entry in memory to a redundant data entry prior to data access. Related systems and methods are also disclosed. The memory is configured to receive a memory access request. The received memory access request comprises a data entry address. The memory uses the data entry address to access data stored in a data array in the memory in a first data access path. It is possible that the rows or columns in the memory may be defective as a result of a manufacturing process. In the event that a row or column at the data entry address in the data array is defective, a data entry redirection circuit redirects the memory access request to a redundant row or column in the data array prior to data access.

主权项

1. A memory, comprising:
a memory access logic circuit provided in a first data access path, the memory access logic circuit configured to:
receive at least a portion of a data entry address of a memory access request as an input for addressing a data entry in a data array in the first data access path; andgenerate an index as an output in the first data access path, the index comprising a data entry address index to index the data array to access the data entry in the data array corresponding to the at least a portion of the data entry address; a data entry redirection circuit, comprising:
a defective data entry comparator circuit provided in a second data access path separate from the first data access path, the defective data entry comparator circuit configured to, prior to indexing the data entry in the data array:
receive at least one defective data entry address as an input from a defective data entry index register representative of the at least one defective data entry address in the data array at a comparator second input;compare the at least a portion of the data entry address to the received at least one defective data entry address; andgenerate a redirection index as an output in the second data access path, the redirection index comprising a redirection data entry address index to a redundant data entry in the data array if the received at least a portion of the data entry address matches the received at least one defective data entry address; anda data entry address index selector configured to select the redirection index to index the data array if the received at least a portion of the data entry address does match the at least one received defective data entry address.