Diagnostic And Reset Considerations; Figure 60. Reset Error Register Values - Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications

11.3 Diagnostic and Reset considerations

The Set Max password, the Set Max security mode and the Set Max unlock counter are not retained over
a Power On Reset but are retained over a Hard Reset or Soft Reset.
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 com-
mand – the Device 0 Error register value is interpreted using the table below.
Device 1
present?
The "x" indicates the appropriate Diagnostic Code for the Power on, RESET-,
Soft Reset, or Device Diagnostic error.

Figure 60. Reset error register values

DASP- is read by Device 0 to determine if Device 1 is present. If Device 1 is pre-
sent 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 not present, Device 0 does not
Assert DASP- at POR.
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
Yes Yes
Yes No
Yes No
No (not read)
No (not read)
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
Device 0
Passed Register
Yes
No
Yes
No
Yes
No
76
Error
01h
0xh
81h
8xh
01h
0xh