Hitachi HUS154530VLF400 User Manual

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification

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An Exchange is a set of one or more related non-concurrent sequences that may flow in the same or opposite directions. The 
exchange is identified by an Originator Exchange Identifier (OX_ID) and a Responder Exchange Identifier (RX_ID) in the 
frame header.

The Basic Link Services are all frames with no payload. The Header TYPE field is set to 00h (Basic Link Service) and R_CTL 
is set to 1000xxxxb (Basic Link_Data, Code = xxxx). 

NOP and RMC are prohibited by the Disk Profile. If the drive receives either an NOP or an RMC, it will ignore it.

Note: PLDA 2.1 specifies: “Reserved FC-PH fields are not required to be checked for zeroes. Validity bits set to 0 remove any 
requirement to check the corresponding field for zeroes (e.g., if F_CTL bit 3=0, receiving N_Ports are not required to verify 
that the parameter field in word 5 of the frame header contains zeroes).” As such, the drive does not validate 1) reserved FC 
fields or 2) fields that are not reserved but are not valid for the current frame (as the example above with F_CTL bit 3). This 
does not apply to any reserved field checking and testing within the FCP_CDB. These fields are checked as per ANSI SCSI 
requirements. 

Although ABTS is a Fibre Channel Basic Link Service, it is used by SCSI-FCP to implement the Abort Task, Task Manage-
ment function. It may only be used by a SCSI initiator to abort an entire exchange using the Recovery Abort protocol. Refer to 
18.4.1, “Abort Task (Implemented as ABTS BLS)” on page 111 for a description of the Recovery Abort Protocol and the 
frame payloads. 

The response to ABTS is either BA_ACC or BA_RJT. 

0000 No 

Operation 

NOP 

0001 Abort 

Sequence 

ABTS 

0010 Remove 

Connection 

RMC 

0100 Basic 

Accept 

BA_ACC 

0101 Basic 

Reject 

BA_RJT 

Others Reserved