Seagate Fibre Channel Interface - Manual (Page 123)

Fibre Channel Interface Manual, Rev. D 109
[1] Enclosure Services Processor negates START_1 and START_2 to indicate that it is requesting communi-
cation with the drive.
[2] The drive asserts –PARALLEL ESI to indicate it is ready to begin communication with the Enclosure Ser-
vices Processor.
[3] The drive determines that enclosure is SFF-8067 compliant by noting that SEL_(0:3) bits have inverted
and that SEL_6 and SEL_7 have the value that the drive is presenting.
[4] The Enclosure Services Processor asserts –ENCL_ACK to indicate it is ready to begin communication
with the drive.
[5] The drive negates –PARALLEL ESI to end the ESI transfer and prepares for power removal.
Figure 19. Prepare for Removal
10.5.2 EIE operations
Following successful discovery of an EIE transfer request, the drive transfers an ESI command to the enclo-
sure using the write and command phase procedure defined in the SFF-8067 Specification for 40-pin SCA-2
Connector w/Bidirectional ESI, Rev. 3.0, section 6.4.2.2. The contents of the command are defined in 8.3. The
device follows the command with a read phase procedure as described in the SFF-8067 Specification for 40-
pin SCA-2 Connector w/Bidirectionally ESI, Rev. 3.0, section 6.4.2.3 to retrieve the transfer request information
from the enclosure.
If the enclosure is requesting information, the drive sends an ESI command with Send = 1 to indicate to the
enclosure it is ready to transfer the requested information. The command is followed by a write of the informa-
tion requested by the enclosure. This information is defined in the SFF-8067 Specification for 40-pin SCA-2
Connector w/Bidirectionally ESI, Rev. 3.0, section 8.3. Following the write, the drive negates –Parallel ESI to
end the operation. Figure 20 is a summary of these operations.
START_1/ START_2
–PARALLEL ESI
–DSK_WR SEL_6
–DSK_RD SEL_5
–ENCL_ACK SEL_4 /
/
/
/
[1]
D(0:3) SEL_(0:3) –SEL_ID(0:3)
1 sec max device delay
[2] [3] [4] [5]
1.2 second max enclosure delay
1 µsec max enclosure delay
max drive delay 5 ms