IBM DTTA-351010 Hard Drive Specifications - Page 82

Diagnostic and Reset considerations

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(*4) In the case of Sleep mode, the device goes to Standby mode. In other case, the device does not change current mode. 10.1.1 Register Initialization Register Error Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status Alternate Status Default Value Diagnostic Code 01h 01h 00h 00h A0h 50h 50h Figure 63. Default Register Values After power on, hard reset, or software reset, the register values are initialized as shown in Figure 63. Code Description 01h No error detected 02h Formatter device error 03h Sector buffer error 04h ECC circuitry error 05h Controller microprocessor error 8xh Device 1 failed Figure 64. Diagnostic Codes The meaning of the Error Register diagnostic codes resulting from power on, hard reset or the Execute Device Diagnostic command are shown in Figure 64. 10.2 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 74 OEM Specifications for DTTA-3xxxxx

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(*4)
In the case of Sleep mode, the device goes to Standby mode.
In other case, the device does not
change current mode.
10.1.1
Register Initialization
Register
Default Value
Error
Diagnostic Code
Sector Count
01h
Sector Number
01h
Cylinder Low
00h
Cylinder High
00h
Device/Head
A0h
Status
50h
Alternate Status
50h
Figure 63. Default Register Values
After power on, hard reset, or software reset, the register values are initialized as shown in Figure 63.
Code
Description
01h
No error detected
02h
Formatter device error
03h
Sector buffer error
04h
ECC circuitry error
05h
Controller microprocessor error
8xh
Device 1 failed
Figure 64. Diagnostic Codes
The meaning of the Error Register diagnostic codes resulting from power on, hard reset or the Execute
Device Diagnostic command are shown in Figure 64.
10.2
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
74
OEM Specifications for DTTA-3xxxxx