Automatic resume from suspend for IEEE-1394 PHY

A physical layer interface port in a communication system, the physical layer interface port comprising:

• a first sensor, the first sensor for causing a connected flag to be set to TRUE when a different physical layer interface port is sensed;
• a second sensor, the second sensor for causing an input bias flag to be cleared to FALSE when an input bias is not sensed;
• and
• a controller coupled to the first sensor and the second sensor, the controller for causing a resume flag to be set to TRUE if the connected flag is TRUE and the input bias flag is FALSE, the controller thereby automatically causing the physical layer interface port to resume data communication.

A physical layer interface port in a communication system, the physical layer interface port comprising:

• means for setting a connected flag to TRUE when a second physical layer interface port is sensed;
• means for clearing an input bias flag to FALSE if an input bias is not sensed;
• and
• means for setting a resume flag coupled to the means for setting the connected flag, the means for clearing the input bias, the means for setting the resume flag setting the resume flag to TRUE if the connected flag is TRUE and the input bias flag, thereby automatically causing the physical layer interface port to resume data communication.

A digital signal processor for inclusion in a physical layer interface port in a communication system, the digital signal processor comprising:

• digital signal processing code for
• setting a connected flag to TRUE when another physical layer interface port is sensed;
• clearing an input bias flag to FALSE if an input bias is not sensed;
• and
• setting a resume flag to TRUE if the connected flag is TRUE and the input bias flag, thereby automatically causing the first physical layer interface port to resume data communication.

An IEEE-1394 compliant PHY comprising:

• a data communication port, the data communication port for transmitting data to a different IEEE-1394 compliant PHY, the data communication port for receiving data from the different IEEE-1394 compliant PHY;
• a first sensor, the first sensor for causing a connected flag to be set to TRUE when the different physical layer interface port is sensed;
• a second sensor, the second sensor for causing an input bias flag to be cleared to FALSE when an input bias is not sensed;
• and
• a controller coupled to the data communication port, the first sensor and the second sensor, the controller for causing a resume flag to be set to TRUE if the connected flag is TRUE and the input bias, the controller thereby automatically causing the IEEE-1394 compliant PHY to resume data communication.