7K6000 datasheet(49/274 Pages) WESTERN

49 / 274 page

HGST Hard Disk Drive Specification

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.

8.5

Device Control Register

HOB

SRST

-IEN

Table 28

Device Control Register

Bit Definitions

HOB

HOB (high order byte) is defined by the 48-bit Address feature set. A write to any Command

SRST (RST)

Software Reset. The device is held reset when RST=1. Setting RST=0 re-enables 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.

8.6

Device/Head Register

DRV

HS3

HS2

HS1

HS0

Table 29

Device/Head 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.

DRV

Device. This product ignores this bit.

HS3,HS2,HS1,HS0

Head Select. These four bits indicate binary encoded address of the head. HS0 is the least

significant bit. At command completion, these bits are updated to reflect the currently selected

head.

The head number may be from zero to the number of heads minus one.

In LBA mode, 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.

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