Port State indicates what the port is actually in the process of doing. This value may be one of : INACTIVE - H/TPAD port inactive entered during boot WTPOLSERVE - TPAD is waiting for response to a poll WTSELRESP - TPAD is waiting for the response to a select WTDATARESP - H/TPAD is waiting for data to be acknowledged DATA - H/TPAD is in the process of sending/receiving data SEL/POL - TPAD is about to select or poll a controller. This is the most common state for a TPAD SELECT - TPAD is about to select a device POLL - TPAD is about to poll a device WTENQRESP - H/TPAD is waiting for a NAK response to an ENQ sent IDLE - HPAD is waiting for the host to send commands. This is the most common state of the HPAD WTEOT - HPAD is waiting for an expected EOT from the host FLUSHINGDATA - HPAD encountered an error in the message received from the host. As a result, the data is being flushed WTLCM - HPAD received a read/modify and is waiting for the response from the TPAD.