IBM DTCA-24090 Hard Drive Specifications - Page 78

Diagnostic and Reset considerations

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10.2 Diagnostic and Reset considerations 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 DASPto 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 the device is active. In all the above cases: Power on, RESET-, Soft reset, and the EXECUTE DEVICE DIAGNOSTIC command the Device 0 Error register is shown in Figure 47. 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 Where x indicates the appropriate Diagnostic Code for the Power on, RESET-, Soft reset, or Device Diagnostic error. Figure 47. Reset error register values 70 OEM Specifications of DTCA-2xxxx 2.5 inch H D D

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10.2
Diagnostic and Reset considerations
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 DIAG-
NOSTIC 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 the device is active.
In all the above cases: Power on, RESET-, Soft reset, and the EXECUTE DEVICE DIAGNOSTIC
command the Device 0 Error register is shown in Figure 47.
Device 1
PDIAG
Device 0
Error
Present?
Asserted?
Passed
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
Where x indicates the appropriate Diagnostic Code for
the Power on, RESET-, Soft reset, or Device Diagnostic
error.
Figure 47. Reset error register values
70
OEM Specifications of DTCA-2xxxx 2.5 inch HDD