Hitachi HTS725050A9A364 Datasheet download pdf (Page 54)

7K500 OEM Specification

Page 54 of 176

HTS7250XXA9A3XX support both Logical CHS Addressing Mode and LBA Addressing Mode as the

sector addressing mode.

The host system may select either the currently selected CHS translation addressing or LBA

addressing on a command-by-command basis by using the L bit in the DEVICE register. So a host

system must set the L bit to 1 if the host uses LBA Addressing mode.

12.4.1

12.4.112.4.1

12.4.1

Logical CHS Addressing Mode

Logical CHS Addressing Mode Logical CHS Addressing Mode

Logical CHS Addressing Mode

The logical CHS addressing is made up of three fields: the cylinder number, the head number and

the sector number. Sectors are numbered from 1 to the maximum value allowed by the current CHS

translation mode but can not exceed 255(0FFh). Heads are numbered from 0 to the maximum value

allowed by the current CHS translation mode but can not exceed 15(0Fh). Cylinders are numbered

from 0 to the maximum value allowed by the current CHS translation mode but cannot exceed

65535(0FFFFh).

When the host selects a CHS translation mode using the INITIALIZE DEVICE PARAMETERS

command, the host requests the number of sectors per logical track and the number of heads per

logical cylinder. The device then computes the number of logical cylinders available in requested

mode.

The default CHS translation mode is described in the Identify Device Information. The current CHS

translation mode also is described in the Identify Device Information.

12.4.2

12.4.212.4.2

12.4.2

LBA Addressing Mode

LBA Addressing Mode LBA Addressing Mode

LBA Addressing Mode

Logical sectors on the device shall be linearly mapped with the first LBA addressed sector (sector 0)

being the same sector as the first logical CHS addressed sector ( cylinder 0, head 0, sector 1).

Irrespective of the logical CHS translation mode currently in effect, the LBA address of a given

logical sector does not change. The following is always true:

LBA = ( (cylinder * heads_per_cylinder + heads)

* sectors_per_track ) + sector - 1

where heads_per_cylinder and sectors_per_track are the current translation mode values.

On LBA addressing mode, the LBA value is set to the following register.

Device <--- LBA bits 27-24

LBA High <--- LBA bits 23-16

LBA Mid <--- LBA bits 15- 8

LBA Low <--- LBA bits 7- 0

12.5

12.512.5

12.5 Power Management Feature

Power Management Feature Power Management Feature

Power Management Feature

The power management feature set permits a host to modify the behavior in a manner which

reduces the power required to operate. The power management feature set provides a set of

commands and a timer that enables a device to implement low power consumption modes.

HTS7250XXA9A3XX implements the following set of functions.

A Standby timer

Idle command

Idle Immediate command

Sleep command

Standby command

Standby Immediate command

12.5.1

12.5.112.5.1

12.5.1

Power Mode

Power Mode Power Mode

Power Mode

Sleep Mode

The lowest power consumption when the device is powered on occurs in Sleep Mode.

When in sleep mode, the device requires a reset to be activated.

Standby Mode

The device interface is capable of accepting commands, but as the media may not

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 175 176

Comments to this Manuals

No comments

Hitachi HTS725050A9A364 Datasheet Page 54

Comments to this Manuals

Related products and manuals for Internal hard drives Hitachi HTS725050A9A364