Communication channel calibration for drift conditions

A method for calibrating a bidirectional communication channel, including a first component having a transmitter and a receiver, a second component having a receiver and a transmitter, and a communication link coupling the first and second components, the communication channel transmitting data using the transmitter on the first component and receiving data using the receiver on the second component with a first parameter of the communication channel set to a first operation value, and receiving data using the receiver on the first component and transmitting data using the transmitter on the second component with a second parameter of the communication channel set to a second operation value;

• comprising:
• executing a calibration cycle including transmitting a calibration pattern using the transmitter on the first component and receiving the calibration pattern using the receiver on the second component with the first parameter set to a calibration value, and determining a calibrated value of the first parameter in response to the received calibration pattern;
• and
• prior to determining said calibrated value of said calibration cycle, transmitting data using the transmitter on the second component and receiving the data using the receiver on the first component with the second parameter set to the second operation value, wherein the first parameter comprises a drive timing point for the transmitter on the first component.

A method for calibrating a bidirectional communication channel, including a first component having a transmitter and a receiver, a second component having a receiver and a transmitter, and a communication link coupling the first and second components, the communication channel transmitting data using the transmitter on the first component and receiving data using the receiver on the second component with a first parameter of the communication channel set to a first operation value, and receiving data using the receiver on the first component and transmitting data using the transmitter on the second component with a second parameter of the communication channel set to a second operation value;

• comprising:
• executing a calibration cycle including transmitting a calibration pattern using the transmitter on the first component and receiving the calibration pattern using the receiver on the second component with the first parameter set to a calibration value, and determining a calibrated value of the first parameter in response to the received calibration pattern;
• and
• prior to determining said calibrated value of said calibration cycle, transmitting data using the transmitter on the second component and receiving the data using the receiver on the first component with the second parameter set to the second operation value, wherein the first parameter comprises a receive timing point for the receiver on the second component.

A method for calibrating a communication channel, including a first component having a transmitter coupled to a data source, a second component having a receiver coupled to a signal destination and a communication link coupling the first and second components, the communication channel transmitting data from the data source using the transmitter on the first component and receiving data using the receiver on the second component with a parameter of the communication channel set to an operation value;

• the method comprising executing calibration cycles from time to time, the calibration cycles comprising:
• de-coupling the data source from the transmitter;
• adjusting the parameter to a calibration value;
• supplying a calibration pattern to the transmitter;
• transmitting the calibration pattern on the communication link using the transmitter on the first component;
• receiving the calibration pattern on the communication link using the receiver on the second component;
• re-coupling the data source to the transmitter and setting the parameter to the operation value;
• and
• determining a calibrated value of the parameter of the communication channel in response to the received calibration pattern, wherein said re-coupling occurs prior to said determining.

A method for calibrating a bidirectional communication channel, including a first component having a transmitter and a receiver, a second component having a receiver and a transmitter, and a communication link coupling the first and second components, the communication channel transmitting data using the transmitter on the first component and receiving data using the receiver on the second component with a first parameter of the communication channel set to a first operation value, and receiving data using the receiver on the first component and transmitting data using the transmitter on the second component with a second parameter of the communication channel set to a second operation value;

• comprising:
• executing a calibration cycle including transmitting a calibration pattern using the transmitter on the first component and receiving the calibration pattern using the receiver on the second component with the first parameter set to a calibration value;
• storing the calibration pattern as received using the receiver at the second component;
• transmitting the stored calibration pattern using the transmitter on the second component and receiving the data using the receiver on the first component with the second parameter set to the second operation value;
• and
• analyzing the stored calibration pattern using logic at the first component and determining a calibrated value of said first parameter in response to said analyzing.

A method for calibrating a communication channel, including a first component having a transmitter coupled to a data source, a second component having a receiver coupled to a signal destination and a communication link coupling the first and second components, the communication channel transmitting data from the data source using the transmitter on the first component and receiving data using the receiver on the second component with a parameter of the communication channel set to an operation value;

• the method comprising:
• storing a value of a first edge parameter and a value of a second edge parameter, wherein said operation value of said parameter of the communication channel is a function of the first and second edge parameters;
• executing a calibration cycle;
• the calibration cycle including iteratively adjusting the value of the first edge parameter, transmitting a calibration pattern using the transmitter on the first component, receiving the calibration pattern using the receiver on the second component, and comparing the received calibration pattern with a stored calibration pattern, to determine an updated value for the first edge value;
• the calibration cycle also including iteratively adjusting the value of the second edge parameter, transmitting a calibration pattern using the transmitter on the first component, receiving the calibration pattern using the receiver on the second component, and comparing the received calibration pattern with a stored calibration pattern, to determine an updated value for the second edge value;
• and
• as a result of the calibration cycle, determining a new operation value for the parameter based on the function of the updated values of the first and second edge parameters.