IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 89

Diagnostic and reset considerations

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9.3 Diagnostic and reset considerations For each Reset and Execute Device Diagnostic the diagnostic is done as follows: Power On 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. Hard Reset, 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 as shown in the figure below. 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 'x' indicates the appropriate Diagnostic Code for the Power on, RESET-, Soft Reset, or Device Diagnostic error. Figure 78. Reset error register values Deskstar 120GXP hard disk drive specifications 75

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9.3 Diagnostic and reset considerations
For each Reset and Execute Device Diagnostic the diagnostic is done as follows:
Power On 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.
Hard Reset, 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 com-
mand the Device 0 Error register as shown in the figure 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?
'x' indicates the appropriate Diagnostic Code for the Power on, RESET–, Soft Reset, or Device Diagnostic
error.
Figure 78. Reset error register values
Deskstar 120GXP hard disk drive specifications
75