Automatically synchronizing ring oscillator frequency of a receiver

An integrated circuit device for adjusting the frequency of a ring oscillator, the device comprising:

• frequency detection circuitry that accepts a link training signal and an internally generated clock signal as input and compares the training signal with the clock signal;
• frequency calibration circuitry for trimming the internally generated clock signal based on an output from the frequency detection circuitry;
• a ring oscillator generating a signal having a target frequency;
• and
• phase-locked loop circuitry that receives instructions from the frequency calibration circuitry and performs operations on the target frequency.

A tangible computer-readable medium containing computer instructions for adjusting a ring oscillator in a receiver, the computer instructions comprising:

• instructions for receiving an incoming signal having a known frequency;
• instructions for creating an internally generated clock signal having an internal frequency;
• instructions for inputting the incoming signal and the internally generated clock signal into a frequency detector, thereby creating a detector output;
• and
• instructions for adjusting the internal frequency based on the detector output, wherein the internal frequency is adjusted to be closer to the known frequency of the incoming signal.