摘要:
Described herein are a method and apparatuses for providing customizable error correction for memory arrays. In one embodiment, an apparatus includes a memory device having a memory array to store data and an analog to digital sense unit coupled to the memory array. The analog to digital sense unit senses analog signals associated with the memory array and converts the analog signals into distributions of digital values. An error-correcting code (ECC) unit receives the distributions of digital values from the analog to digital sense unit. A configurable non-volatile look-up table generates ECC parameters including error probability data and provides the ECC parameters to the ECC unit for error correction. The error probability data has error probability values that are associated with the distributions of digital values. The ECC unit executes an ECC algorithm to provide error correction using the error probability data.
摘要:
Described herein are a method and apparatuses for providing customizable error correction for memory arrays. In one embodiment, an apparatus includes a memory device having a memory array to store data and an analog to digital sense unit coupled to the memory array. The analog to digital sense unit senses analog signals associated with the memory array and converts the analog signals into distributions of digital values. An error-correcting code (ECC) unit receives the distributions of digital values from the analog to digital sense unit. A configurable non-volatile look-up table generates ECC parameters including error probability data and provides the ECC parameters to the ECC unit for error correction. The error probability data has error probability values that are associated with the distributions of digital values. The ECC unit executes an ECC algorithm to provide error correction using the error probability data.
摘要:
Methods and systems to refresh a non-volatile memory device, such as a phase change memory. In an embodiment, as a function of system state, a memory device performs either a first refresh of memory cells using a margined read reference level or a second refresh of error-corrected memory cells using a non-margined read reference level.
摘要:
A read current high enough to threshold a phase change memory element may be used to read the element without thresholding the memory element. The higher current may improve performance in some cases. The memory element does not threshold because the element is read and the current stopped prior to triggering the memory element.
摘要:
A voltage derived from accessing a selected bit using one read current may be utilized to read a selected bit of an untriggered phase change memory after the read current is changed. As a result, different reference voltages may be used to sense the state of more resistive versus a less resistive selected cells. The resulting read. window or margin may be improved in some embodiments.
摘要:
A method of controlling a discharge of bit lines of a matrix of memory cells comprises conditioning a value of a current flowing through a bit line of the matrix during a bit line discharge phase to an absence of an indication of defectiveness of the bit line. The method allows preventing crowbar currents that otherwise flow during the bit line discharge phase when a defective bit line exhibits a short-circuit to a defective word line.
摘要:
A voltage derived from accessing a selected bit using one read current may be utilized to read a selected bit of an untriggered phase change memory after the read current is changed. As a result, different reference voltages may be used to sense the state of more resistive versus a less resistive selected cells. The resulting read window or margin may be improved in some embodiments.
摘要:
Methods and systems to refresh a non-volatile memory device, such as a phase change memory. In an embodiment, as a function of system state, a memory device performs either a first refresh of memory cells using a margined read reference level or a second refresh of error-corrected memory cells using a non-margined read reference level.
摘要:
A voltage derived from accessing a selected bit using one read current may be utilized to read a selected bit of an untriggered phase change memory after the read current is changed. As a result, different reference voltages may be used to sense the state of more resistive versus a less resistive selected cells. The resulting read window or margin may be improved in some embodiments.