Ata Interface; Ata Interface Connector Pin Assignments; Bus Signal Levels - Seagate ST3660A - Medalist 545 MB Hard Drive Product Manual

Medalist XE Family Product Manual, Rev. B

3.0 ATA interface

This section discusses commands and modes whose implementation is
unique for these drives. For a general discussion of the Seagate ATA
interface, refer to the Seagate ATA Interface Reference Manual , publica-
tion number 36111- xxx . Onboard diagnostics, ECC performance test and
supported BIOS are also discussed.

3.1 ATA interface connector pin assignments

The drive is connected to the computer through the 40-pin interface
connector shown in Figure 3 on page 13. The pin assignments for the
interface are shown in Figure 7 on page 20. For a complete description
of each pin, see the Seagate ATA Interface Reference Manual .
Note. This text uses the following conventions:
Signal names are in upper case.
Signal names followed by a minus sign (–) indicate that the
signal is active low. Otherwise, the signal is active high.
Note. The drives do not use the SPSYNC– signal.

3.2 Bus signal levels

Signals that the drive sends have the following output characteristics
measured at the drive connector.
Logic low
Logic high
Signals that the drive receives must have the following input charac-
teristics measured at the drive connector.
Logic low
Logic high
0 to 0.4V
2.5 to 5.25V
0 to 0.8V
2.0 to 5.25V
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