Synchronous read channel integrated circuit employing a channel quality circuit for calibration
DCFirst Claim
1. A synchronous read channel for reading data recorded on a magnetic disk storage medium by detecting binary data from a sequence of discrete time sample values generated by sampling pulses in an analog read signal from a magnetic read head positioned over the magnetic disk storage medium, comprising:
- (a) a sampling device, responsive to a sampling clock, for sampling the analog read signal to generate the discrete time sample values;
(b) a timing recovery circuit, responsive to the discrete time sample values, for extracting timing information;
(c) a discrete time sequence detector, responsive to the discrete time sample values, for detecting the binary data; and
(d) a channel quality circuit, responsive to the discrete time sample values, for calibrating the synchronous read channel.
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Abstract
A synchronous read channel is disclosed which samples an analog read signal from a magnetic read head positioned over a magnetic disk medium, filters the sample values according to a desired partial response, extracts timing information from the filtered sample values, and detects an estimated data sequence from the filtered sample values using a discrete time sequence detector. A Channel Quality circuit accumulates various signals generated by the read channel, such as sample errors, gain errors, timing errors, etc., for use in calibrating the read channel components and estimating the bit error rate.
71 Citations
15 Claims
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1. A synchronous read channel for reading data recorded on a magnetic disk storage medium by detecting binary data from a sequence of discrete time sample values generated by sampling pulses in an analog read signal from a magnetic read head positioned over the magnetic disk storage medium, comprising:
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(a) a sampling device, responsive to a sampling clock, for sampling the analog read signal to generate the discrete time sample values; (b) a timing recovery circuit, responsive to the discrete time sample values, for extracting timing information; (c) a discrete time sequence detector, responsive to the discrete time sample values, for detecting the binary data; and (d) a channel quality circuit, responsive to the discrete time sample values, for calibrating the synchronous read channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A synchronous read channel for reading data recorded on a magnetic disk storage medium by detecting binary data from a sequence of discrete time sample values generated by sampling pulses in an analog read signal from a magnetic read head positioned over the magnetic disk storage medium, comprising:
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(a) a timing recovery circuit, responsive to the discrete time sample values, for extracting timing information; (b) a discrete time equalizer for equalizing the discrete time sample values according to a predetermined partial response to generate equalized sample values; (c) a discrete time sequence detector, responsive to the equalized sample values, for detecting the binary data; and (d) a channel quality circuit, responsive to the equalized sample values, for calibrating the synchronous read channel. - View Dependent Claims (14, 15)
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Specification