Parallel data skew detecting circuit
First Claim
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1. A parallel data skew detecting circuit, comprising:
- a plurality of parallel data channels including a plurality of serial shift registers to transmit a sample signal;
a timing signal generating circuit to generate a timing signal in a predetermined period;
a skew storage circuit to record the shift register which receives the sample signal for the respective data channels when the timing signal is generated; and
a processing completion detecting circuit to detect that all of the data channels have received the sample signal within a skew detecting period defined by the number of the shift registers, and to output a completion signal upon completion of the detection, to thereby confirm that skew is detected.
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Abstract
A sample signal is sequentially transported through a plurality of serial shift registers in respective data channels. The sample signal varies between a pair of levels, namely a first level and a second level, to resemble a step with respect to time. The shift registers are monitored by a skew detection circuit to identify the shift register that receives the sample signal at the time of a generated timing signal. Data signals are then passed through the recorded shift register while compensating for detected skew in parallel transmission data.
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7 Claims
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1. A parallel data skew detecting circuit, comprising:
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a plurality of parallel data channels including a plurality of serial shift registers to transmit a sample signal; a timing signal generating circuit to generate a timing signal in a predetermined period; a skew storage circuit to record the shift register which receives the sample signal for the respective data channels when the timing signal is generated; and a processing completion detecting circuit to detect that all of the data channels have received the sample signal within a skew detecting period defined by the number of the shift registers, and to output a completion signal upon completion of the detection, to thereby confirm that skew is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification