Product manual

DiamondMax Plus8 20/30/40GB AT 5-1
Chapter 5
ATA BUS INTERFACE AND ATA COMMANDS
This chapter describes the interface between DiamondMax Plus8 hard disk drives and
the ATA bus. The commands that are issued from the host to control the drive are
listed, as well as the electrical and mechanical characteristics of the interface.
5.1 INTRODUCTION
Maxtor DiamondMax Plus8 hard disk drives use the standard ATA/ATAPI
interface. Support of various options in the standard are explained in the following
sections.
5.2 MECHANICAL INTERFACE
5.2.1 Signal Cable and Connector
The Maxtor DiamondMax Plus8 hard disk drive contains a 40-pin unitized
connector for both signal and power connections as well as configuration jumpers.
The dimensions and specifications of the unitized connector comply with Annex.
A in the ATA/ATAPI standard.
The Maxtor DiamondMax Plus8 drives require the use of an 80 conductor cable
(ATA/ATAPI-6, Annex. A, Figure A.4 and description) to support the drive’s
Ultra DMA capability.
5.3 ELECTRICAL INTERFACE
5.3.1 ATA Bus Interface
5.3.1.1 Electrical Characteristics
Signals on the ATA interface are assigned to connector pins according to Annex. A in
the ATA/ATAPI-6 standard for the 80 conductor cable assembly. The signaling
protocol complies with clause 9 and signal timing complies with clause 10 of the
standard.
The Maxtor DiamondMax Plus8 hard disk drives support all Ultra DMA Data
Transfer modes (0 - 5) defined in the ATA/ATAPI-6 standard. In addition, these
drives support Mode 6, and can send and receive data at the full 133MB/s transfer rate.
Hosts may assert the RESET- signal for longer than the minimum. When power is
applied with RESET- asserted, the Maxtor DiamondMax Plus8 disk media will not
begin to spin up until RESET- is negated. This may reduce maximum current