System for reducing distortion of signals transmitted over a bus
First Claim
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1. A data processing system, comprising:
- a bus;
a signal transmitter for transmitting a data signal over said bus;
a signal receiver for receiving the data signal transmitted by said signal transmitter over said bus;
a signal diagnostic unit for detecting a distortion in the signal; and
an adjustment unit for adjusting a characteristic of the data processing system in response to the distortion detected by said signal diagnostic unit.
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Abstract
A computer system measures bus signal distortion and then adjusts certain characteristics of the signal transmitted over the bus, or adjusts other characteristics of the bus or the load on the bus so that signal distortion is reduced. Distortion characteristics that may be measured include signal voltage overshoot and undershoot, and data setup and hold times. Characteristics of the signal and the system that may be adjusted include changing the slew rate of the signal, changing the data setup and hold times, and changing the load impedance on the bus.
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Citations
18 Claims
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1. A data processing system, comprising:
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a bus;
a signal transmitter for transmitting a data signal over said bus;
a signal receiver for receiving the data signal transmitted by said signal transmitter over said bus;
a signal diagnostic unit for detecting a distortion in the signal; and
an adjustment unit for adjusting a characteristic of the data processing system in response to the distortion detected by said signal diagnostic unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer system comprising:
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a bus;
a host device including a signal transmitter for transmitting a signal over said bus, and further including a slew rate adjustment unit for adjusting the slew rate of the signal as transmitted by said signal transmitter;
a peripheral device including a signal receiver for receiving signals transmitted over said bus by said signal transmitter; and
a signal waveform diagnostic unit for detecting distortion in the signal as received by said signal receiver. - View Dependent Claims (10, 11, 12, 13, 15, 16)
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14. A computer system comprising:
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a host part;
a bus for transferring a data signal; and
an interface for attaching a peripheral device to said bus, wherein said host part adjusts a slew rate of the signal based on the waveform of the signal as detected at said interface.
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17. A device for attachment to a computer system comprising:
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a waveform diagnostic part for diagnosing a waveform of a signal that is transmitted from a bus provided in the computer system and is received by said device; and
a correction information output part for delivering information for correcting the waveform of the signal received by said device, to the computer system based on a diagnosis by said waveform diagnostic part.
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18. A docking station for removable attachment to a computer system, said docking station comprising:
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a docking bus connectable to a computer bus provided in the computer system;
a waveform diagnostic part for diagnosing a waveform of a signal transmitted from the compter bus and received on said docking bus; and
a correction information output part for delivering information for correcting the waveform of the signal that is outputted from said bus, to the computer system based on a diagnosis by said waveform diagnosis part.
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Specification