Hitachi IC25N040ATCS04-0 Specifications - Page 88

Register initialization

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11.2 Register initialization After a power on, a hard reset, or a software reset, the register values are initialized as shown in the table below. 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 58. Default Register Values If an Execute Device Diagnostic command is carried out, if the system is powered on, or if a hard reset occurs, the system generates an Error Register diagnostic code. See the table below for a description of the codes. Code 01h 02h 03h 04h 05h 8xh Figure 59. Diagnostic Codes Description No error detected Formatter device error Sector buffer error ECC circuitry error Controller microprocessor error Device 1 failed Hitachi Travelstar 60GH & 40GN hard disk drive specifications 75

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11.2 Register initialization
After a power on, a hard reset, or a software reset, the register values are initialized as shown in the table
below.
50h
Alternate Status
50h
Status
A0h
Device/Head
00h
Cylinder High
00h
Cylinder Low
01h
Sector Number
01h
Sector Count
Diagnostic Code
Error
Default Value
Register
Figure 58. Default Register Values
If an Execute Device Diagnostic command is carried out, if the system is powered on, or if a hard reset oc-
curs, the system generates an Error Register diagnostic code. See the table below for a description of the
codes.
Device 1 failed
8xh
Controller microprocessor error
05h
ECC circuitry error
04h
Sector buffer error
03h
Formatter device error
02h
No error detected
01h
Description
Code
Figure 59. Diagnostic Codes
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
75