Controlling A Reference Voltage For A Clock And Data Recovery Circuit

A computer-readable medium including instructions that when executed enable a system to perform operations comprising:

• performing a power mode negotiation with a device coupled to the system, the system comprising a receiver;
• determining a power mode for the receiver based at least in part on the power mode negotiation;
• accessing an entry of a table based on the determined power mode and obtaining at least one control code stored in the entry;
• and
• controlling at least one circuit element to provide a selected reference voltage level to a reference input node of a comparator of the receiver based on the at least one control code.

An apparatus comprising:

• an analog front end to receive a digital input and output a data stream from the digital input, the analog front end including a comparator having a first input node to receive the digital input and a second input node to receive a reference voltage;
• a microcontroller coupled to the analog front end, the microcontroller to determine a power mode for the apparatus based at least in part on the digital input, obtain at least one control code stored in an entry of a storage based on the determined power mode, and control a controllable circuit element coupled to the second input node to provide a selected reference voltage level to the reference input node based on the at least one control code;
• and
• the controllable circuit element, wherein the microcontroller is to provide the at least one control code to the controllable circuit element to cause the controllable circuit element to provide the selected reference voltage to the second input node.