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ST43401N/ND, ST43402ND User’s Manual, Rev. B 37
Grounding the system
Grounding the system through the power cables and I/O cables is usually
sufficient to protect against noise and emissions.
Synchronizing the spindle
The spindle sync feature makes it possible to synchronize the spindle rotation
of a group of disc drives. This reduces the latency normally encountered when
the initiator switches between multiple disc drives.
Figure 19 shows two system configurations. In one type of system, one of the
disc drives in the system provides the reference clock. In the other type, an
external signal source provides the reference clock.
Figure 19. System diagram for spindle sync
Internal Source
J05
Drive
T
SP
Spindle
Sync
Cable
Select
Plug
J05
Drive
(master)
J05
Drive
SP
J05
Drive
T
SP
✴
32 loads
maximum
Terminator
✴
Master designated by jumper or by initiator
External Source
T
Spindle
Sync
Cable
J05
Drive
J05
Drive
SP
J05
Drive
T
SP
32 loads
maximum
Terminator
SP
Signal Source