Set Features Command (Ef H ); Sleep Command (99 H , E6 H ); Interface Connector Pin Assignments - Seagate ST5660A Product Manual

ST5660A Product Manual, Rev. A
Two ST5660A commands that are described in the ATA Interface
Reference Manual require further elaboration. These commands are
described below.
3.1.2 Set Features command (EF
The Set Features command is used to enable or disable the Read
Look-ahead, write immediate and write merging features. These features
are enabled during startup. The values used in the features register of
the ST5660A drive are:
02 Enable write immediate and write merging
H
03 Set transfer mode
H
55 Disable read look-ahead
H
82 Disable write immediate and write merging
H
AA Enable read look-ahead
H
3.1.3 Sleep command (99
This command performs the same function as the Standby Immediate
command.

3.2 Interface connector pin assignments

The signal name and signal direction for each I/O connector pin is
described in Figure 6 on page 26. See the Seagate ATA Interface
Reference Manual , publication number 36111- xxx , for a complete de-
scription of each pin.
Signal names are in upper case. If the signal name is followed by a minus
sign (–), the signal is active low. Otherwise, the signal is active high.
)
H
, E6 )
H H
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