Medalist 1270 Product Manual, August 1995
25
3.0 ATA interface
The drive uses 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 supported by the drive on pages 27 and 28. Commands
and features with specific applications for the drive 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,
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 (46 centimeters).
3.1 ATA Interface connector pin assignments
The signal name and signal direction for each I/O connector pin is shown
in Figure 7 on page 26. See the Seagate ATA Interface Reference
Manual , publication number 36111- xxx , for a complete description of
each pin.
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.