Cable Select Option - Seagate ST3655 Series Product Manual

18 ST3655 Family AT Drives Product Manual, Rev. A

2.5 Cable select option

If your computer and both of your drives support cable select, you can
use the cable select option to determine the master and slave, according
to the following guidelines, which are illustrated in Figure 4.
• The drive plugged into the I/O connector that carries the CSEL signal
is the master.
• The drive plugged into the I/O connector that does not carry the CSEL
signal is the slave.
To configure your drives using cable select, you need to:
• Install jumpers on pins 1 and 2 and pins 3 and 4 of the master/slave
jumper block and pins 6 and 8 of the options jumper block. These
jumper blocks are both shown in Figure 3 on page 16.
• Use a special interface ribbon cable to select master and slave. The
cable and its connectors transmit the CSEL signal (pin 28) to the
master drive, but not to the slave drive, as shown in Figure 4.
Note. You cannot configure the drive for both cable select and spindle
synchronization at the same time because both options use the
same interface signal line (pin 28) and the same jumper block pin
(pin 8 of the options jumper block).