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a node supports. RNC can also be used to specify which document(s) define the operating parameters between two nodes, as
well as specify any additional parameters not specified during N_Port Login.
Table 64: RNC/ACC payload
Byte
Item
0
53h for RNC, 02 for ACC
1
Reserved
2-3
Payload Length
4
RNC Flags
5-6
Reserved
7
VU Information Length (VU_Len)
8
Vendor Identifier
-15
16->
Capability Entry(s)
16+m->
Vendor Unique Information
Payload Length is a two byte unsigned integer that specifies the length of the RNC payload. The minimum length of the RNC
payload is 16 bytes, and its maximum length is limited to 256 bytes. While the maximum length of the ACC payload is not
defined, the drive limits its RNC_ACC to 256 bytes.
RNC Flags is a one byte field that defines options that are applicable to all Capability Entries contained in the RNC payload.
The RNC Flags field is as follows:
• Bit 7 - Select
When this flag is set to one, the RNC_ACC payload shall contain only one Capability Entry. This Capability Entry is
selected from the list of Capability Entries specified in the RNC payload. When this flag is set to zero, the RNC_ACC
payload shall contain all of the Capability Entries that a node wishes to report.
The drive does not support the Select Flag and this field must be set to zero. Otherwise, the drive will respond with
an LS_RJT containing a reason code of 03h "Logical error" and a reason code explanation of 2Ah "No additional
explanation".
• Bits 6-0 - Reserved
The VU Information Length (VU_Len) field is a one byte unsigned integer, which specifies the length of the Vendor Unique
Information field. A maximum length of 128 bytes is supported.
The Vendor Identifier contains eight bytes of ASCII data, which identifies the vendor of the product.
Vendor Unique Information is defined by vendor or profile specific documentation.
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
86
Size (Bytes)
4
1
2
1
2
1
8
m
0-128
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