Ata Interface; Ata Interface Connector Pin Assignments - Seagate Decathlon 850 Product Manual

Ata interface drive

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Decathlon 850 ATA Product Manual, July 1995

3.0 ATA interface

The ST5850A uses a Fast ATA-2 interface. The interface is in compli-

ance with ANSI ATA (AT Attachment) Interface X3T9.2/143 Rev. 4.0 ;

SFF 8011: ATA Timing Extension for Local Bus Attachments, Rev. 2.0

and SFF 8019: Identify Drive Data for Drives Under 8 GB . This section

lists the ATA commands supported by the drive on pages 27 and 28.

Commands and features with specific application for the drive are also

discussed in this section. For more information on Seagate's implemen-

tation of the ATA interface and commands, see the Seagate ATA

Interface Reference Manual, publication number 36111- xxx .

The ATA interface consists of single-ended, TTL-compatible receivers

and drivers using an asynchronous interface protocol. The drivers can

sink up to 24 mA and drive a load up to 300 pF. The integrity of the ATA

interface is affected by the interface cable. It is designed to support a

40-conductor, nonshielded interface cable with a maximum length of 18

inches (0.46 meters).

The signal name and signal direction for each I/O connector pin is

described in Figure 9 on page 26. For a complete description of each

pin, see the Seagate ATA Interface Reference Manual , publication

number 36111- xxx.

Signal names are shown in upper-case letters. If the signal name is

followed by a minus sign (–), the signal is active low. Otherwise, the

signal is active high.

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