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Hitachi HUS154530VLF400 User Manual

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Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
73
  
17.3.5.1  Common Service Parameters
The Common Service Parameters apply to all classes of service and are exchanged during Login. 
Table 47: Common Service Parameters
 
(FLOGI_REQ/FLOGI_ACC)
The upper byte of the FC-PH Version field indicates the highest version of FC-PH that is supported and the lower byte indi-
cates the lowest. The code/version relationship is given by Table 42.
The BB_Credit field indicates the number of frame buffers that a port guarantees to have immediately available when a loop 
circuit is opened. The drive sets this field to 0 (zero); i.e., the drive grants the FL_Port a Login BB_Credit of 0. 
The Common Features field contains the following flags: 
• VV- Valid Vendor Version Level 
 
When set to one, this flag indicates that the Vendor Version Level field in the frame payload contains valid informa-
tion. The drive sets this field to 0b. 
• N/F Port - N_Port/F_Port 
 
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 checks this 
field in the FLOGI_ACC and will revert to PLDA behavior if it is not set to one. The drive sets this field to 0b.
Byte
BIT
Default
Request 
Values
7
6
5
4
3
2
1
0
4      
PH Version - Highest Supported
20h
5
PH Version - Lowest Supported
20h
6
7
(MSB)                                                               Buffer-to-Buffer Credit
(LSB)
00h
00h
8
Reserved
VV
N/F Port
ABCM
Reserved
00h
9
Reserved
DHD
Reserved
PL
00h
10
11
(MSB)                                                BB Received Data Field Size
(LSB)
08h
00h
12
13
14
15
(MSB)                                               
FLOGI_REQ = Reserved; FLOGI_ACC = R_A_TOV
(LSB)
00h
00h
00h
00h
16
17
18
19
(MSB)
FLOGI_REQ = Reserved; FLOGI_ACC = E_D_TOV
(LSB)
00h
00h
00h
00h