Signal adjustment receiver circuitry

Receiver circuitry for adjusting a digital signal, comprising:

• a first user-programmable parameter and a second user-programmable parameter;
• an equalization circuit that provides frequency content adjustment, wherein the equalization circuit adjusts frequency content below a first frequency based on the first user-programmable parameter and adjusts frequency content above a second frequency;
• a signal normalization circuit that is connected to an output of the equalization circuitry, wherein the signal normalization circuit converts a digital signal amplitude to a normalized signal amplitude, wherein the normalized signal amplitude is based on the second user-programmable parameter;
• and
• a control circuit that is connected to the equalization circuit, wherein the control circuit controls the frequency content adjustment above the second frequency.

Receiver circuitry for controlling jitter in a received digital signal, where the received digital signal was transmitted with a particular transmit amplitude, the receiver circuitry comprising:

• an equalization circuit that receives the digital signal and adjusts the frequency content of the digital signal;
• and
• a signal normalization circuit that is connected to an output of the equalization circuitry, wherein the signal normalization circuit converts a digital signal amplitude to a normalized signal amplitude, wherein the normalized signal amplitude is based on a user-programmable parameter,
• wherein the user-programmable parameter is configured based on the particular transmit amplitude to provide a desired jitter performance.

A method for adjusting a digital signal using receiver circuitry that includes an equalization circuit and a signal normalization circuit, the method comprising:

• adjusting frequency content of the digital signal above a first frequency using the equalization circuit;
• and
• adjusting frequency content of the digital signal below a second frequency by configuring the equalization circuit and the signal normalization circuit in one of at least two modes, wherein the at least two modes comprise:
• a first mode in which the signal normalization circuit is configured to adjust the frequency content below the second frequency based on an output of the equalization circuit, and
• a second mode in which the equalization circuit and the signal normalization circuit are configured to adjust the frequency content below the second frequency based on respective first and second user-programmable parameters.