High speed signaling system with adaptive transmit pre-emphasis

摘要

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.

主权项

1. An integrated circuit, comprising:
a receiver to receive a signal via a conductive path from a transmitter external to the integrated circuit, the signal having a sequence of signal levels representing respective bits of a digital sequence, each signal level in the sequence dependent on a logical function of binary state of a current bit transmitted and binary state of another bit of the digital sequence, the receiver to sample the signal to generate data samples corresponding to the respective bits; and circuitry to send a request to the transmitter to modify a setting used by the transmitter to generate the signal levels so as to change relative dependence of the signal levels on of the binary state of the current bit and the binary state of the other bit.