Receiver training during a SATA out of band sequence

A method comprising:

• a first device transmitting a COMWAKE signal via a serial bus;
• in response to the transmitting the COMWAKE signal, the first device receiving a first training signal via the serial bus;
• and
• setting a first receiver parameter to a value based on a characteristic of the first training signal to obtain a desired physical layer quality before the first device receives a COMWAKE signal via the serial bus.

A communications apparatus comprising:

• a first line driver transmitting data at a first end of a serial bus to a second line receiver at a second end of the serial bus;
• a first line receiver receiving data at the first end of the serial bus from a second line driver at the second end of the serial bus, the first line receiver having a selectable input parameter that controls a physical layer quality of data received at the first end of the serial bus;
• programming instructions stored in memory that causes the second line driver to transmit a training signal that is not a COMWAKE signal to the first line receiver in response to the first line driver transmitting a COMWAKE signal to the second line receiver;
• and
• a controller that compares a received physical layer quality of the training signal at the first line receiver to a desired physical layer quality and computes a value for the input parameter to obtain a desired physical layer quality.