Dave's PCF WIP: Terms

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estimated bit error rate

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"Estimated bit error rate" refers to a value that directly, indirectly, and/or approximately represents a bit error rate for a certain set of data bits stored in one or more memory cells. Advantageously, an estimated bit error rate serves as a suitable proxy for a calculated bit error rate and may be obtained with fewer computing cycles and in a faster time than time needed to determine a bit error rate. One example of an estimated bit error rate is a rate resulting from a Bit Error Rate (BER) Estimation Scan (BES) operation. A BES read scan operation is a type of read scan operation in with candidate read levels for certain read levels for a logical page a tested in a predefined order. In one embodiment, the BES read scan operation tests a particular candidate read level and an algorithm determines results for simulated / emulated testing of other read levels for a particular logical page.A BES read scan operation, in one embodiment, may determine an estimated bit error rate by comparing syndrome weights between iterative read level sensing or read operations to determine which candidate read level results in the fewest number of activated memory cells. In such embodiments, a syndrome weight below a threshold serves as a proxy for a bit error rate, an estimated bit error rate. A syndrome weight is a number of unsatisfied ECC parity check equations nodes/equations from a Low-Density Parity-Check (LDPC) error correction code decoder (ECC decoder).