Hitachi IC25N080ATMR04-0 Specifications - Page 81

Diagnostic and Reset considerations

Page 81 highlights

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 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. 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. 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 47: Reset error register values Device 1 present? Yes Yes Yes Yes No No PDIAG- Asserted? 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. Travelstar 80GN Hard Disk Drive Specification 71

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Travelstar 80GN Hard Disk Drive Specification
71
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:
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.
The "x" indicates the appropriate Diagnostic Code for the Power on, RESET-, Soft Reset, or Device Diagnostic
error.
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.
Table 47: Reset error register values
Device 1 present?
PDIAG- Asserted?
Device 0 Passed
Error Register
Yes
Yes
Yes
01h
Yes
Yes
No
0xh
Yes
No
Yes
81h
Yes
No
No
8xh
No
(not read)
Yes
01h
No
(not read)
No
0xh