Ata Interface; Ata Interface Connector Pin Assignments - Seagate Medalist 1640 Product Manual

Medalist 1640 and 2140 Product Manual, January 1996 25

3.0 ATA interface

The drives use an ATA-2 interface. The interface is in compliance 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 the drives support on pages 27 and 28. Commands and
features with specific applications for the drives are also discussed in this
section. For more information on Seagate's implementation of the ATA
interface and commands, see the Seagate ATA Interface Manual, pub-
lication number 36111-xxx.
The ATA interface consists of single-ended, TTL-compatible receivers
and drivers and uses 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).

3.1 ATA interface connector pin assignments

The signal name and signal direction for each I/O connector pin is
described in Figure 7 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.