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:
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.
Execute Device
Diagnostic
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.
Soft Reset
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 asser
DASP- to indicate device activity. If Device 1 is not present, Device 0 does not
Assert DASP- at POR.
Power On Reset,
Hard Reset
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.
0xhNo(not read)No
01hYes(not read)No
8xhNoNoYes
81hYesNoYes
0xhNoYesYes
01hYesYesYes
Error
Register
Device 0
Passed
PDIAG-
Asserted?
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
Travelstar 60GH & 40GN hard disk drive specifications
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