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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)
Byte
7
4
5
6
(MSB)
7
8
Reserved
9
10
(MSB)
11
12
(MSB)
13
14
15
16
(MSB)
17
18
19
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.
6
5
4
PH Version - Highest Supported
PH Version - Lowest Supported
VV
N/F Port
Reserved
BB Received Data Field Size
FLOGI_REQ = Reserved; FLOGI_ACC = R_A_TOV
FLOGI_REQ = Reserved; FLOGI_ACC = E_D_TOV
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
BIT
3
2
Buffer-to-Buffer Credit
ABCM
DHD
73
Default
Request
Values
1
0
(LSB)
Reserved
Reserved
PL
(LSB)
(LSB)
(LSB)
20h
20h
00h
00h
00h
00h
08h
00h
00h
00h
00h
00h
00h
00h
00h
00h
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