Datasheet

11.4.12 Sector Number Register

This register contains the starting sector number for any disk data access for the subsequent command.

The sector number is from one to the maximum number of sectors per track.

In LBA mode this register contains Bits 0–7. At the end of the command this register is updated to reflect

the current LBA Bits 0–7.

11.4.13 Status Register

ERR0CORRDRQDSCDFDRDYBSY

01234567

Status Register

Figure 58. Status Register

This register contains the device status. The contents of this register are updated whenever an error

occurs and at the completion of each command.

If the host reads this register when an interrupt is pending, it is considered to be the interrupt acknow-

ledge. Any pending interrupt is cleared whenever this register is read. If BSY=1. mo other bits in the

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.

ERR

Corrected Data. Always 0.CORR (COR)

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.

DRQ

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 ready 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, this bit is set by device in spite of not spinning up.

DSC

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

to 0 after the Status Register is ready by the host.

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.

DRDY (RDY)

Busy. BSY=1 whenever the device is accessing the registers. The host should not read or

write any registers when BSY=1. If the host reads any register when BSY=1, the contents of