Hitachi IC35L060AVV207 Datasheet download pdf (Page 80)

8.1 Alternate Status Register

ERRIDXCORDBQ

DSC/

SERV

DFRDYBSY

01234567

Alternate Status Register

Figure 69. Alternate Status Register

This register contains the same information as the Status Register. The only difference is that reading this

page 70 for the definition of the bits in this register.

8.2 Command Register

This register contains the command code being sent to the device. Command execution begins immedi-

ately after this register is written. The command set is shown in Figure 88 on page 106.

All other registers required for the command must be set up before writing the Command Register.

8.3 Cylinder High Register

This register contains the high order bits of the starting cylinder address for any disk access. At the end of

the command this register is updated to reflect the current cylinder number.

In LBA Mode this register contains Bits 16-23. At the end of the command this register is updated to

reflect the current LBA Bits 16-23.

The cylinder number may range from zero to the number of cylinders minus one.

When 48-bit addressing commands are used, the "most recently written" content contains LBA Bits 16-23

and the "previous content" contains Bits 40-47. The 48-bit Address feature set is described in

Section 9.16, "48-Bit Address Feature Set" on page 93.

8.4 Cylinder Low Register

This register contains the low order bits of the starting cylinder address for any disk access. At the end of

the command this register is updated to reflect the current cylinder number.

In LBA Mode this register contains Bits 8-15. At the end of the command this register is updated to reflect

the current LBA Bits 8-15.

The cylinder number may be from zero to the number of cylinders minus one.

When 48-bit addressing commands are used, the "most recently written" content contains LBA Bits 8-15

and the "previous content" contains Bits 32-39.

Deskstar 180GXP hard disk drive specifications

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Hitachi IC35L060AVV207 Datasheet Page 80