Hitachi HUS154530VLF400 User Manual

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

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not one, the drive will respond with an LS_RJT containing a reason code of 03h “Logical error”, and a reason code 
explanation of 0Fh “Invalid Common Service Parameters”. The drive returns a 1b in this field. 

 

When set to one, this flag indicates that the Port supports Random Relative Offset within a Sequence. The Relative 
Offset is only present if bit 3 of the F_CTL field in the frame header is set to 1b. The drive returns a 0b in this field. 

 

When set to one, this flag indicates that the Vendor Version Level field in the frame payload contains valid informa-
tion. The drive returns a 0b in this field. 

 

When set to one, this flag indicates that the Port is an F_Port. When set to zero, it is an N_Port. The drive returns a 0b 
in this field. 

 

When set to one, this flag indicates that the Port supports the Alternate BB-Credit model. The drive returns a 1b in 
this field.

 

When set to one, this flag indicates that the resolution of the E_D_TOV timer shall be 1 ns. When set to zero, the res-
olution shall be 1 ms. The flag is only applicable in a point to point topology. The drive returns a 0b in this field.

 

Only applies to class 1 service. The drive sets this field to 0b.

 

When set to one, this flag indicates that the Port supports Dynamic Half Duplex. The drive returns a 0b in this field.

 

When set to one, this flag indicates that the Port is guaranteeing that it will transmit all frames within an Exchange 
using a continuously increasing SEQ_CNT. If set to zero, normal FC_PH rules regarding SEQ_CNT usage apply. The 
drive returns a 0b in this field.

 

When set to one, this flag indicates that PLOGI Payload Length shall be 256 bytes. If set to zero, the flag specifies 
that the normal 116 byte PLOGI Payload specified in FC-PH-2 is used. The drive returns a 0b in this field.

The Buffer-to-Buffer Receive Data_Field Size field (word 2, bits 11-0) specifies the largest FT_1 frame Data_Field Size that 
may be received by the Nx_Port supplying the Service Parameters as a Sequence Recipient for:

a) a connect-request (SOFc1),

b) a Class 2 Data frame, or

c) a Class 3 Data frame

Values less than 256 or greater than 2 112 are invalid and shall be a multiple of four bytes. An Fx_Port shall support a Data 
Field size of at least 256 bytes.

The Total Concurrent Sequences field indicates the number of concurrent sequences that the Port can support for all 3 
classes. The value sent must be > 0, or the drive will respond with an LS_RJT with a reason code of 03h “Logical error” and a 
reason code explanation of 09h “Service Parm error - Concurrent Seq”. The drive returns a value of FFh in this field. 

The Relative Offset by Information Category field is all flags. The bit position of each set (1) bit determines the Information 
Category; e.g., if Relative Offset is supported for category 0001b (Solicited Data), bit 1 is set. The drive returns a value of 
0002h in this field (Relative Offset supported for Solicited Data only).