Hitachi HTS725050A9A364 Datasheet download pdf (Page 48)

7K500 OEM Specification

Page 48 of 176

SRST (RST)

Software Reset. The device is held reset when RST=1. Setting RST=0 reenables the device.

The host must set RST=1 and wait for at least 5 microseconds before setting RST=0, to

ensure that the device recognizes the reset.

-IEN

Interrupt Enable. When IEN=0, and the device is selected, device interrupts to the host will

be enabled. When IEN=1, or the device is not selected, device interrupts to the host will be

disabled.

11.4

11.411.4

11.4 Device Register

Device Register Device Register

Device Register

7 6 5 4 3 2 1 0

- L - 0 HS3 HS2 HS1 HS0

Table 26 Device Register

This register contains the device and head numbers.

Bit Definitions

Binary encoded address mode select. When L=0, addressing is by CHS mode. When L=1,

addressing is by LBA mode.

HS3,HS2,HS1,HS0

The HS3 through HS0 contain bits 24-

27 of the LBA. At command completion, these bits are

updated to reflect the current LBA bits 24-27.

11.5

11.511.5

11.5 Error Regis

Error RegisError Regis

Error Register

ter ter

ter

Error Register

7 6 5 4 3 2 1 0

CRC UNC 0 IDNF 0 ABRT TK0NF AMNF

Table 27 Error Register

This register contains 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 valid always even if ERR=0 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 “Table 31 Diagnostic Codes” on Page 52 for the definition.

Bit Definitions

ICRCE (CRC)

Interface CRC Error. CRC=1 indicates a CRC error has occurred on the data bus during a

Ultra-DMA transfer.

UNC

Uncorrectable Data Error. UNC=1 indicates an uncorrectable data error has been

encountered.

IDNF (IDN)

ID Not Found. IDN=1 indicates the requested sector’s ID field could not be found.

ABRT (ABT)

Aborted Command. ABT=1 indicates 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. T0N=1 indicates track 0 was not found during a Recalibrate command.

AMNF (AMN)

Address Mark Not Found. AMN=1 indicates the data address mark has not been found after

finding the correct ID field for the requested sector.

This bit is obsolete.

11.6

11.611.6

11.6 Features Register

Features Register Features Register

Features Register

This register is command specific. This is used with the Set Features command, S.M.A.R.T. Function

Set command and Format Unit command.

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 175 176

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Hitachi HTS725050A9A364 Datasheet Page 48

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