Maxtor 1925 User Manual
Page 31
Installation
4-6
Quickview 40 20/30/40GB AT
Table 4-1
AT Jumper Options
Note: In Table 4-1, a 0 indicates that the jumper is removed,
a 1 indicates that the jumper is installed, and an X indi-
cates that the jumper setting does not matter.
4.3.1
Cable Select (CS) Jumper
When a Maxtor Quickview 40 20/30/40GB AT hard disk drive and
another ATA hard disk drive are daisy-chained together, they can be
configured as Master or Slave either by the CS or DS jumpers. To
configure the drive as a Master or Slave with the CS feature, the CS
jumper is installed (1). The drive's position on the 80 conductor Ultra
ATA data cable then determines whether the drive is a Master (Device
0) or a Slave (Device 1). If the drive is connected to the end of the Ultra
(cable Select) data cable the drive is a Master. If the drive is connected
to the middle connection it is set as a Slave.
Once you install the CS jumper, the drive is configured as a Master or
Slave by the state of the Cable Select signal: pin 28 of the ATA bus
connector. Please note that pin 28 is a vendor-specific pin that Maxtor
is using for a specific purpose. More than one function is allocated to
CS, according to the ATA CAM specification (see reference to this
specification in Chapter 1). If pin 28 is a 0 (grounded), the drive is
configured as a Master. If it is a 1 (high), the drive is configured as a
Slave. In order to configure two drives in a Master/Slave relationship
using the CS jumper, you need to use a cable that provides the proper
signal level at pin 28 of the ATA bus connector. This allows two drives
to operate in a Master/Slave relationship according to the drive cable
placement.
The Maxtor Quickview 40 20/30/40GB AT hard disk drives are shipped
from the factory as a Master (Device 0 - CS jumper installed). To
configure a drive as a Slave (Device 1- DS scheme), the CS jumper must
be removed. In this configuration, the spare jumper removed from the
CS
DS
PK
PIN 28
DESCRIPTION
0
0
X
X
Drive is configured as a slave
1
0
X
Gnd
Drive is configured as Master (Device 0) when
attached to the end of a 80 conductor Ultra ATA
cable
0
1
X
X
Drive is configured as a Master
1
0
X
Open
Drive is configured as a Slave (Device 1) when
attached to the middle of a 80 conductor Ultra ATA
cable
1
1
X
X
Drive is configured as a Master with an attached slave
that does not support DASP