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108 Fibre Channel Interface Manual, Rev. D
[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_5 and SEL_6 have the value that the drive is presenting.
[4] The Enclosure Services Processor returns START_1 and START_2 to Case 2, 3, or 4.
[5] The Enclosure Services Processor asserts –ENCL_ACK and discovery continues.
Figure 18. Enclosure Initiated ESI Request
If discovery determines the enclosure does not support an 8067 capable interface or the enclosure does not
return the START_1 and START_2 signals to a valid mated condition, the device negates –PARALLEL_ESI
and prepares for power removal. Figure 19 shows a case where the enclosure does support 8067 ESI transfer
but the enclosure is requesting the drive to prepare for removal. See Table 115, Section 12.6.7 for more infor-
mation on the motor spin-up options.
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
100 nsec min enclosure delay
1 µsec max enclosure delay