High-speed signaling systems with adaptable pre-emphasis and equalization

摘要

A signaling system includes a pre-emphasizing transmitter and an equalizing receiver coupled to one another via a high-speed signal path. The receiver measures the quality of data conveyed from the transmitter. A controller uses this information and other information to adaptively establish appropriate transmit pre-emphasis and receive equalization settings, e.g. to select the lowest power setting for which the signaling system provides some minimum communication bandwidth without exceeding a desired bit-error rate.

主权项

1. A first integrated circuit, comprising:
a transmitter having a transmit equalizer operable to equalize first data to be transmitted to a second integrated circuit; and a receiver having a receive equalizer operable to equalize second data to be received from the second integrated circuit; where the first integrated circuit is operable to implement at least two different modes, including
a first mode, in which the transmit equalizer and the receive equalizer are each operable to mitigate intersymbol interference arising from respective, different symbol latencies relative to a main bit of the first data and a main bit of the second data, respectively, anda second mode, in which a specific symbol latency addressed by the receive equalizer in the first mode is not addressed by the receive equalizer relative to the main bit of the second data, and in which the transmit equalizer is configured to address intersymbol interference arising from a symbol of latency relative to the main bit of the first data which matches the specific symbol latency.