Adaptive calibration of noise predictive finite impulse response filter based on decoder convergence

A storage system, comprising:

• at least one storage device;
• and
• a communication system in communication with the at least one storage device, the communication system further comprising:
• a decoder configured to decode an input signal, wherein the decoder produces one of:
• a converged data output when the decoder decodes the input signal successfully, and a non-converged data output when the decoder decodes the input signal unsuccessfully;
• a convergence monitor configured to determine a calibration procedure based on at least one of:
• a number of times where the decoder decodes successfully, and a number of times where the decoder decodes unsuccessfully;
• and
• a noise predictive calibration circuit configured to utilize output produced by the decoder without qualification when the convergence monitor indicates utilization of a first calibration procedure, the noise predictive calibration circuit further configured to utilize only the converged data output produced by the decoder when the convergence monitor indicates utilization of a second calibration procedure.

A noise predictive calibration method, comprising:

• decoding an input signal to produce one of:
• a converged data output when the input signal is decoded successfully, and a non-converged data output when the input signal is decoded unsuccessfully;
• monitoring whether the input signal is decoded successfully;
• determining a calibration procedure based on at least one of:
• a number of times the input signal is decoded successfully, and a number of times the input signal is decoded unsuccessfully;
• providing noise predictive calibration utilizing data output regardless of whether the data output is converged or non-converged when the determined calibration procedure is a first calibration procedure;
• and
• providing noise predictive calibration utilizing only the converged data output when the determined calibration procedure is a second calibration procedure.