Integrated circuit for in-system signal monitoring
First Claim
1. A system for in-system monitoring of signals, comprising:
- an analog-to-digital converter disposed in an integrated circuit (IC);
a sampling bridge coupled to provide an analog input to the analog-to-digital converter, the sampling bridge coupled to receive first signaling of a first frequency and being internal to the integrated circuit;
a signal generator configured to provide second signaling at a second frequency, the second frequency being a fraction of the first frequency;
sample window circuitry coupled to receive the second signaling and configured to provide third signaling to the sampling bridge at least partially responsive to the second signaling and at least partially responsive to an adjustable impedance setting of the sample window circuitry; and
the sample window circuitry configured to provide an adjustable sample window within a pulse-width range;
wherein the sampling bridge is located within a multi-gigabit transceiver of the IC, or the IC includes a multi-gigabit transceiver coupled to the sampling bridge.
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Accused Products
Abstract
In-system signal monitoring using an integrated circuit such as a programmable logic device is described. An analog-to-digital converter is disposed in the programmable logic device. A sampling bridge is coupled to provide an analog input to the analog-to-digital converter and to receive first signaling of a first frequency. A signal generator is configured to provide second signaling at a second frequency which is a fraction of the first frequency. Sample window circuitry is coupled to receive the second signaling and configured to provide third signaling to the sampling bridge at least partially responsive to the second signaling and at least partially responsive to an adjustable impedance setting of the sample window circuitry. The sample window circuitry is configured to provide an adjustable sample window within a pulse-width range.
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Citations
13 Claims
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1. A system for in-system monitoring of signals, comprising:
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an analog-to-digital converter disposed in an integrated circuit (IC); a sampling bridge coupled to provide an analog input to the analog-to-digital converter, the sampling bridge coupled to receive first signaling of a first frequency and being internal to the integrated circuit; a signal generator configured to provide second signaling at a second frequency, the second frequency being a fraction of the first frequency; sample window circuitry coupled to receive the second signaling and configured to provide third signaling to the sampling bridge at least partially responsive to the second signaling and at least partially responsive to an adjustable impedance setting of the sample window circuitry; and the sample window circuitry configured to provide an adjustable sample window within a pulse-width range; wherein the sampling bridge is located within a multi-gigabit transceiver of the IC, or the IC includes a multi-gigabit transceiver coupled to the sampling bridge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for in-system monitoring of signals, comprising:
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providing an integrated circuit; while operating the integrated circuit, generating within the integrated circuit a first reference signal having a first frequency; converting the first reference signal into a first differential signal, the first differential signal having an adjustable pulse width; obtaining a second differential signal having a second frequency, the first frequency being a fraction of the second frequency; sampling the second differential signal responsive to the pulse width of the first differential signal to provide a signal sample as a first analog signal; converting the first analog signal to a first digital signal in the integrated circuit; adjusting the pulse width of the first differential signal to obtain another signal sample to provide a second analog signal; multiplexing the first analog signal and the second analog signal; selecting the second analog signal for output from the multiplexing; and converting the second analog signal selected to a second digital signal in the integrated circuit; wherein the first analog signal and the second analog signal are respectively associated with different communication channels. - View Dependent Claims (11, 12, 13)
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Specification