AT3550 User Guide V1.00
February 11, 2005
page 7 of 16
3.2 JUMPERS
The following diagram illustrates the locations of the jumpers on the AT3550
controller card. The jumpers are found on both the J1 interface header and the J2
jumper header. Refer to the illustration below. The option jumpers control the
master/slave configuration of the drive, the use of cable selection, drive write
protection, and other factory related functions. All headers are on 2mm centers.
3.2.1 MAIN HEADER (J1) JUMPERS
3.2.2 MASTER/SLAVE
If no jumper is installed or the MA jumper is in place, the drive is selected as the
C: or Master drive. If the drive is to be a Slave device (drive D), install the jumper
ion the SL location. This jumper is part of the unitized ATA interface header and is
on 0.1 inch centers. This location is factory shipped with no jumper or with the
jumper in the MA position, configuring the drive as the master drive.
3.2.3 CABLE SELECT
Jumper CS can be used to let the IDE Cable Select signal select the drive
configuration as either the master or slave device. Shorting the CS pins enables
the Cable Select feature. Leaving the pins unconnected disables the Cable Select
feature. The drive is factory shipped with these pins open.
3.2.4 WRITE PROTECT
The WP jumper is used to write protect the drive. Installing this jumper on either
the J1 or J2 header forces the drive to a write-protect condition, blocking any and
