Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification

 Initiator Connection Tag is set by the drive to the last value received from this Initiator.

 Destination SAS Address contains the port identifier of the SAS port to which a connection is being requested.

 Source SAS Address contains the port identifier on the port that originated this frame (i.e. the drive’s port

address).

 Source Zone Group is set to zero and ignored by the drive per SPL-3

 Pathway Blocked Count indicates the number of times the port has retried this connection request due to

receiving OPEN_REJECT (PATHWAY BLOCKED). The drive will not increment the PATHWAY BLOCKED

COUNT value past FFh.

 Arbitration Wait Time indicates how long the port transmitting the OPEN address frame has been waiting for a

connection request to be accepted. For values from 0000h to 7FFFh, the Arbitration Wait Time timer increments

in one microsecond steps. For values from 8000h to FFFFh, the Arbitration Wait Time timer increments in one

millisecond step.

 More Compatible Features is set to zero and ignored by the drive per SPL-3.

17.5.2

Link Layer Error Handling

This section defines the Link layer error handling of the drive.

Table 38 Link Layer Error Handling (part 1 of 2)

Error Error Handling Procedure

IDENTIFY Timeout

If IDENTIFY is not received before the IDENTIFY timer expires (1ms), firmware is

notified and the drive transmits a COMINIT to initiate a new link reset.

BREAK Received

If BREAK is received while the drive has ACK/NAK balance, BREAK or

BREAK_REPLY is transmitted and a new connection may be opened if the drive

still has frames to transmit. Firmware is not notified. If BREAK is received while

the drive

does NOT have ACK/NAK balance, BREAK or BREAK_REPLY is

transmitted and the current command is aborted and will return Check Condition

status with sense data indicating an ACK/NAK timeout.

NAK and ACK/NAK Timeout

If a NAK is received on a RESPONSE frame, the RESPONSE frame is

retransmitted with the RETRANSMIT bit set to zero. If an ACK or NAK is not

received for a RESPONSE frame within 1ms, the RESPONSE frame will be

retransmitted with the RETRANSMIT bit set to one. The drive will retry sending a

RESPONSE frame once.

Bad Frame CRC

If a frame fails the CRC check, the frame is NAKed by the drive and discarded.

This is a link layer function. The command associated with a NAKed DATA or

XFER_RDY frame is aborted with check condition status and sense data

corresponding to DATA_PHASE_ERROR is returned. COMMAND frames that fail

the CRC check are NAKed and discarded.