P position map (see section 10.5.3.3) – Seagate Fibre Channel Interface User Manual
Page 130
116
Fibre Channel Interface Manual, Rev. D
10.5.3.3
Loop Position Map page
Field definitions (listed alphabetically)
Action Code
02h
Device Address
ESI Page
00h
Identifies the ESI page code used (00h).
Loop Map Port x
This field contains the valid AL_PA entries from the payload of the FC-AL LILP frame. Only the valid AL_PA entries are
transferred to minimize the transfer time on the ESI interface. The maximum Loop Map size is 127 bytes.
Offset Port x
This field Indicates the number of bytes of offset from the FC-AL LILP frame in the Loop Map. A value of 00h indicates the
Loop Map is not available for the port.
Page Length
The total transfer length depends on the number of valid ALPA’s on the loop.
Table 66:
Loop Position Map page
Bit
Byte
7
6
5
4
3
2
1
0
0
0
0
0
0
ESI Page (00h)
1
0
0
0
0
Action Code (02h)
2
3
(MSB)
Page Length (m – 3)
(LSB)
4
Offset Port A (n – 4)
5
(MSB)
Loop Map Port A
.
.
n
(LSB)
n + 1
Offset Port B (m – n + 1)
n + 2
(MSB)
Loop Map Port B
.
.
m
(LSB)
Table
number