Method and circuitry for a pre-emphasis scheme for single-ended center taped terminated high speed digital signaling

Abstract

A method and circuitry for pre-emphasizing transmitted logic signals. The method and circuitry may be applied to single-ended center-taped terminated I/O lines. In one embodiment, a driver circuit may be configured for monitoring the logic values (i.e. logic 0, logic 1, or logic low, logic high) of signals transmitted by the driver circuit. The driver circuit may compare the logic value of a next logic signal to be transmitted with a first previously transmitted signal and a second previously transmitted signal. Pre-emphasis of the next logic signal may occur based on the logic value of the next logic signal to be transmitted as well as the logic values of the first and second logic signals. If the first and second logic signals have the same logic value, and the next logic signal has a different value, the next logic value may be pre-emphasized. If the next logic signal has a logic value that is equivalent to either the first logic signal or the second logic signal, it may be transmitted without pre-emphasis.