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 system comprising:
a transmitter having circuitry to equalize data to be transmitted over a signaling path, the circuitry including a post-cursor tap, a main tap, and a pre-cursor tap; and a receiver to receive the data, the receiver having
a linear equalizer to equalize the data received from the signaling path, anda decision-feedback equalizer with one or more taps to equalize an output of the linear equalizer; where, in a first power mode, the circuitry enables the pre-cursor tap to equalize the data to be transmitted to the receiver only for pre-tap interference, and disables the post-cursor tap; and where, in a second power mode, the post-cursor tap is enabled, and the linear equalized is disabled.