Hitachi IC25N040ATCS04-0 Specifications - Page 84

Error Register, 10 Features Register, 11 Sector Count Register

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10.9 Error Register 76 CRC UNC Error Register 5 4 3 2 1 0 0 IDNF 0 ABRT TK0NF AMNF Figure 55. Error Register This register contains the status from the last command executed by the device or a diagnostic code. At the completion of any command, except Execute Device Diagnostic, the contents of this register are always valid even if ERR = 0 is in the Status Register. Following a power on, a reset, or completion of an Execute Device Diagnostic command, this register contains a diagnostic code. See Figure 59 on page 75 for the definitions. Bit Definitions ICRCE (CRC) Interface CRC Error. When CRC = 1, it indicates that a CRC error has occurred on the data bus during a Ultra DMA transfer. UNC Uncorrectable Data Error. When UNC = 1 it indicates that an uncorrectable data error has been encountered. IDNF (IDN) ID Not Found. When IDN = 1, it indicates that the requested sector's ID field could not be found. ABRT (ABT) Aborted Command. When ABT = 1, it indicates that the requested command has been aborted due to a device status error or an invalid parameter in an output register. TK0NF (T0N) Track 0 Not Found. When T0N = 1, it indicates that track 0 was not found during a Recalibrate command. AMNF (AMN) Address Mark Not Found. When AMN = 1, it indicates that the data address mark has not been found after finding the correct ID field for the requested sector. 10.10 Features Register This register is command specific. This register is used with the Set Features command, the S.M.A.R.T. Function Set command, and the Format Unit command. 10.11 Sector Count Register This register contains the number of sectors of data requested to be transferred on a read or write operation between the host and the device. If the value in the register is set to 0, a count of 256 sectors is specified. If the register is zero at command completion, the command was successful. If it is not successfully completed, the register contains the number of sectors which need to be transferred in order to complete the request. The contents of the register are defined differently on some commands. These definitions are given in section 13.0, "Command descriptions" on 107. Hitachi Travelstar 60GH & 40GN hard disk drive specifications 71

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10.9 Error Register
AMNF
TK0NF
ABRT
0
IDNF
0
UNC
CRC
0
1
2
3
4
5
6
7
Error Register
Figure 55. Error Register
This register contains the status from the last command executed by the device or a diagnostic code. At
the completion of any command, except Execute Device Diagnostic, the contents of this register are
always valid even if ERR = 0 is in the Status Register.
Following a power on, a reset, or completion of an Execute Device Diagnostic command, this register con-
tains a diagnostic code. See Figure 59 on page 75 for the definitions.
Bit Definitions
Address Mark Not Found. When AMN = 1, it indicates that the data address mark has
not been found after finding the correct ID field for the requested sector.
AMNF (AMN)
Track 0 Not Found. When T0N = 1, it indicates that track 0 was not found during a
Recalibrate command.
TK0NF (T0N)
Aborted Command. When ABT = 1, it indicates that the requested command has been
aborted due to a device status error or an invalid parameter in an output register.
ABRT (ABT)
ID Not Found. When IDN = 1, it indicates that the requested sector's ID field could not be
found.
IDNF (IDN)
Uncorrectable Data Error. When UNC = 1 it indicates that an uncorrectable data error
has been encountered.
UNC
Interface CRC Error. When CRC = 1, it indicates that a CRC error has occurred on the
data bus during a Ultra DMA transfer.
ICRCE (CRC)
10.10 Features Register
This register is command specific. This register is used with the Set Features command, the S.M.A.R.T.
Function Set command, and the Format Unit command.
10.11 Sector Count Register
This register contains the number of sectors of data requested to be transferred on a read or write
operation between the host and the device. If the value in the register is set to 0, a count of 256 sectors is
specified.
If the register is zero at command completion, the command was successful. If it is not successfully com-
pleted, the register contains the number of sectors which need to be transferred in order to complete the
request.
The contents of the register are defined differently on some commands. These definitions are given in
section 13.0, “Command descriptions” on 107.
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
71