Hitachi HTS725050A9A364 Datasheet download pdf (Page 50)

7K500 OEM Specification

Page 50 of 176

DRDY (RDY)

Device Ready. RDY=1 indicates that the device is capable of responding to a command.

RDY will be set to 0 during power on until the device is ready to accept a command.

Device Fault. DF=1 indicates that the device has detected a write fault condition. DF is set to

0 after the Status Register is read by the host.

DSC

Device Seek Complete. DSC=1 indicates that a seek has completed and the device head is

settled over a track. DSC is set to 0 by the device just before a seek begins. When an error

occurs, this bit is not changed until the Status Register is read by the host, at which time the

bit again indicates the current seek complete status.

When the device enters into or is in Standby mode or Sleep mode, this bit is set by device in

spite of not spinning up.

DRQ

Data Request. DRQ=1 indicates that the device is ready to transfer a word or byte of data

between the host and the device. The host should not write the Command register when

DRQ=1.

CORR (COR)

Corrected Data. Always 0.

IDX

Index. Always 0

ERR

ERR=1 indicates that an error occurred during execution of the previous command. The

Error Register should be read to determine the error type. The device sets ERR=0 when the

next command is received from the host.

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Hitachi HTS725050A9A364 Datasheet Page 50