Hitachi IC25N040ATCS04-0 Specifications - Page 89

Diagnostic and Reset considerations

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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 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 not present, Device 0 does not Assert DASP- at POR. Soft Reset 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. 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 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. 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. Device 1 present? Yes Yes Yes Yes No No PDIAGAsserted? Yes Yes No No (not read) (not read) Device 0 Passed Yes No Yes No Yes No Error Register 01h 0xh 81h 8xh 01h 0xh The "x" indicates the appropriate Diagnostic Code for the Power on, RESET-, Soft Reset, or Device Diagnostic error. Figure 60. Reset error register values Hitachi Travelstar 60GH & 40GN hard disk drive specifications 76

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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 assert
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.
0xh
No
(not read)
No
01h
Yes
(not read)
No
8xh
No
No
Yes
81h
Yes
No
Yes
0xh
No
Yes
Yes
01h
Yes
Yes
Yes
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
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
76