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1.2 Names and identifiers
Device names are worldwide unique names for devices within a transport
protocol. Port names are worldwide unique names for ports within a transport
protocol. Port identifiers are the values by which ports are identified within a
domain, and are used as SAS addresses. Phy identifiers are unique within a
device.
1.2.1 SAS addresses
Table 1.1 defines the SAS address format. SAS addresses shall be compatible
with the NAA (Name Address Authority) IEEE Registered format identification
descriptor defined in SPC-3. The SAS address shall be worldwide unique. A SAS
address of 00000000_00000000h indicates an invalid SAS address.
Bit
7
Byte
0
1
2
3
4
5
6
7
SAS addresses represent any of three types of WWNs: a device SAS address
representing a device address, a port SAS address representing Port-A, or a port
SAS address representing Port-B.
The INQUIRY (page 83 command reports the device SAS address, while the
mode parameter (page 19) and log parameter (page 18) report port SAS addresses.
− device SAS address:
− port SAS address (Port-A):
− port SAS address (Port-B):
C = 4 bits: Company ID
X = 4 bits: Serial number for WWN
y = 1 bit: Reserved
C141-C009
Table 1.1 SAS address format
6
5
4
(MSB)
IEEE COMPANY ID
(LSB) (MSB)
5CCC CCCX XXXX XXX yy00
5CCC CCCX XXXX XXX yy10
5CCC CCCX XXXX XXX yy11
1.2 Names and identifiers
3
2
1
0
(LSB)
1-9
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