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