High speed signaling system with adaptive transmit pre-emphasis
DCFirst Claim
1. A method of operation within a signaling system, the method comprising:
- transmitting a digital sequence to a receiver using a transmit equalizer, the transmit equalizer having a plurality of taps;
receiving feedback from the receiver representing a setting for at least one of the plurality of taps, the feedback adjusted to compensate for a target signal level; and
updating a tap weight associated with the at least one of the plurality of taps responsive to the feedback.
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Abstract
A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.
20 Citations
40 Claims
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1. A method of operation within a signaling system, the method comprising:
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transmitting a digital sequence to a receiver using a transmit equalizer, the transmit equalizer having a plurality of taps; receiving feedback from the receiver representing a setting for at least one of the plurality of taps, the feedback adjusted to compensate for a target signal level; and updating a tap weight associated with the at least one of the plurality of taps responsive to the feedback. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus, comprising:
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a set of drivers to transmit a digital sequence to a receiver, each driver controlled in association with one of a plurality of taps; and an update circuit to update a tap weight associated with at least one of the plurality of taps responsive to feedback from the receiver, the feedback representing a setting for the at least one of the plurality of taps, the feedback adjusted to compensate for a target signal level. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. An apparatus, comprising:
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means for transmitting a digital sequence to a receiver using a transmit equalizer having a plurality of taps; means for receiving feedback from the receiver representing a setting for at least one of the plurality of taps, the feedback adjusted to compensate for a target signal level; and means for updating a tap weight associated with the at least one of the plurality of taps responsive to the feedback.
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Specification