Datasheet

1.11 Enclosure Service Interface (ESI)
C141-C008 1-111
Table 1.36 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
:
n
(MSB)
Loop Map Port A
(LSB)
n + 1 Offset Port B (m–n+1)
n + 2
:
m
(MSB)
Loop Map Port B
(LSB)
• Offset: The offset field frorn the FC-AL LILP frame. The offset field
indicates the number of bytes in the Loop Map. A value of 00h indicates the
Loop Map is not available for the port.
• Loop Map: 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.
Table 1.37 Initiate LIP action specific bits
0 0 0 0 0 0 LIP
Loop
B
LIP
Loop
A
• LIP Loop A/B Bits: When set to a l, the drive enters the Loop Initialization
Process on either loop A, B, or both as indicated by these bits. The drive
originates a LIP (F7, AL_PS) if it has a valid AL_PA. The drive originates a
LIP (F7, F7) if it does not have a valid AL_PA.