Diagnostic And Reset Considerations; Figure 78. Reset Error Register Values - IBM IC35L040AVVN07-0 - 40GB IDE Deskstar 120GXP 7200RPM UATA-100 07N9682 Specifications

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.
Device 1
present? Asserted?
Yes
Yes
Yes
Yes
No (not read)
No (not read)
'x' indicates the appropriate Diagnostic Code for the Power on, RESET–, Soft Reset, or Device Diagnostic
error.

Figure 78. Reset error register values

PDIAG– Device 0
Passed
Yes Yes
Yes No
No Yes
No No
Yes
No
Deskstar 120GXP hard disk drive specifications
Error
Register
01h
0xh
81h
8xh
01h
0xh
75