Atapi Interface; Introduction; Ata-2 Interface; Ata-2 Signals - Seagate STT20000A Product Manual

ATAPI Interface

ATAPI interface

Introduction

ATA-2 Interface

ATA-2 Signals

DASP-

PDIAG-

STT20000A Product Manual
The STT20000A provides an ATA Packet Interface (ATAPI) controller for
communications between the host computer and the drive. The drive supports the
QIC-157 standard interface.
The STT20000A provides a connection between the driver/card and the component
of the PC. Refer to chapter 3 for specific cabling and connector information.
Note: Refer to the QIC-157 Standard for detailed information about the this
interface.
This chapter clarifies the use of several ATA-2 signals and ATAPI commands that
are either vague or optional in the QIC-157 specification.
The information about the ATA-2 interface is presented in the following topics: ATA-
2 Signals, ATA Registers, and ATA Commands.
Only the DASP and PDIAG- signals are described in the following paragraphs.
This signal is used during power-up handshake sequences for master/slave
identification per ATA-2 specifications.
Because the device has its own front-panel activity LED, this signal is not driven by
this device (to indicate activity) after power-up is complete.
This signal is used during power-up handshake sequences for master/slave
identification per ATA-2 specifications.
Chapter 5
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