Maxtor 1925 - Manual (Page 44)

Quickview 40 20/30/40GB AT 5-1
Chapter 5
ATA BUS INTERFACE AND ATA COMMANDS
This chapter describes the interface between Quickview 40 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 Quickview 40 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 Quickview 40 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 Quickview 40 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 Quickview 40 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 Quickview 40 disk media will not begin
to spin up until RESET- is negated. This may reduce maximum current consumption
for the overall system.