Integrated circuit output driver circuitry with programmable preemphasis
First Claim
Patent Images
1. A programmable logic device, comprising:
- differential circuitry that produces differential digital output data signals; and
preemphasis driver circuitry that produces preemphasis signals for steepening slopes of data bit edges in the differential digital output data signals, wherein the preemphasis driver circuitry includes programmable circuitry that is programmable with a plurality of slope parameter values to adjust an amount of slope steepening provided by the preemphasis driver circuitry.
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Abstract
Programmable logic device integrated circuitry having differential I/O circuitry is provided. The differential I/O circuitry may include output drivers for providing differential digital output data signals across pairs of output lines. A user may program the I/O circuitry to accommodate different high-speed differential I/O signaling standards. The user may also program the I/O circuitry to provide a desired amount of preemphasis to the output data signals.
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Citations
24 Claims
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1. A programmable logic device, comprising:
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differential circuitry that produces differential digital output data signals; and preemphasis driver circuitry that produces preemphasis signals for steepening slopes of data bit edges in the differential digital output data signals, wherein the preemphasis driver circuitry includes programmable circuitry that is programmable with a plurality of slope parameter values to adjust an amount of slope steepening provided by the preemphasis driver circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A programmable logic device, comprising:
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differential driver circuitry that produces differential digital output data signals, wherein the differential driver circuitry programmably accommodates different differential signaling standards; and preemphasis driver circuitry that produces preemphasis signals for steepening slopes of data bit edges in the differential digital output data signals, wherein the preemphasis driver circuitry includes programmable circuitry that is programmable with a plurality of slope parameter values to adjust an amount of slope steepening provided by the preemphasis driver circuitry. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A programmable logic device, comprising:
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differential driver circuitry that produces differential digital differential driver circuitry programmably accommodates output data signals, wherein the different differential signaling standards; and programmable preemphasis driver circuitry that produces preemphasis signals that are superimposed over the differential digital output data signals, wherein the programmable preemphasis driver circuitry is programmable with a plurality of slope parameter values to steepen slopes of leading and trailing data bit edges in the differential digital output data signals. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification