Seagate STT8000A Manual download pdf (Page 39)

ATAPI Interface Chapter 5

STT8000A Product Manual Page 31

ATAPI interface

Introduction

The STT8000A provides an ATA Packet Interface (ATAPI) controller for

communications between the host computer and the drive. The drive supports the

QIC-157 standard interface.

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.

ATA-2 Interface

The information about the ATA-2 interface is presented in the following topics: ATA-

2 Signals, ATA Registers, and ATA Commands.

ATA-2 Signals

Only the DASP and PDIAG- signals are described in the following paragraphs.

DASP-

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.

PDIAG-

This signal is used during power-up handshake sequences for master/slave

identification per ATA-2 specifications.

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Seagate STT8000A Manual Page 39