Diagnostic And Reset Considerations - Hitachi HTS542525K9SA00 Specifications

10.3 Diagnostic and Reset considerations

For each Reset and Execute Device Diagnostic, the diagnostic is done as follows:
Power On Reset
Hard Reset,
Soft Reset
Execute Device
Diagnostic
In each case – Power On Reset [Hard Reset], Soft Reset, and the Execute Device Diagnostic command – the
Device 0 Error register value is interpreted using the table below.
Table 59: Reset error register values
Device 1 present?
Yes
Yes
Yes
Yes
No
No
The "x" indicates the appropriate Diagnostic Code for the Power on, RESET-, Soft Reset, or Device Diagnostic
error.
DASP– is read by Device 0 to determine if Device 1 is present. If Device 1 is present,
Device 0 shall read PDIAG– to determine when it is valid to clear the BSY bit and
whether Device 1 has powered on or reset without error, otherwise Device 0 clears the
BSY bit whenever it is ready to accept commands. Device 0 may assert DASP– to
indicate device activity.
If Device 1 is present, Device 0 shall read PDIAG– to determine when it is valid to clear
the BSY bit and whether Device 1 has reset without any errors; otherwise, Device 0 shall
simply reset and clear the BSY bit. DASP– is asserted by Device 0 (and Device 1 if it is
present) in order to indicate device active.
If Device 1 is present, Device 0 shall read PDIAG– to determine when it is valid to clear
the BSY bit and if Device 1 passed or failed the EXECUTE DEVICE DIAGNOSTIC
command; otherwise, Device 0 shall simply execute its diagnostics and then clear the
BSY bit. DASP– is asserted by Device 0 (and Device 1 if it is present) in order to
indicate that the device is active.
PDIAG- Asserted?
Yes
Yes
No
No
(not read)
(not read)
Deskstar 7K160 Hard Disk Drive Specification
Device 0 Passed
Yes
No
Yes
No
Yes
No
77
Error Register
01h
0xh
81h
8xh
01h
0xh