Installation

29

 

 

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 14 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.

Internal Source

Spindle

SyncJ05

Cable

T

Drive

SP

Select

Plug

J05

Drive

(master)

J05

Drive

SP

 

External Source

 

 

Spindle

 

 

 

 

 

 

 

 

 

 

 

Signal Source

Sync

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cable

 

 

 

 

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J05

Drive

SP

J05

Drive

SP

32 loads

maximum

Terminator

J05

T

SP

Drive

32 loads

maximum

Terminator

J05

T

SP

Drive

Master designated by jumper or by initiator

Figure 14. System diagram for spindle sync

Page 34
Image 34
Seagate ST43400N/ND user manual Synchronizing the spindle, System diagram for spindle sync