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Hitachi HDS723020BLA642 manual Write DMA CAh/CBh, Write DMA Command CAh/CBh

Models: HDS723020BLA642

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7K200 SATA OEM Specification

14.43Write DMA (CAh/CBh)

Command Block Output Registers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Command Block Input Registers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register

 

 

 

 

7

 

 

6

 

 

 

5

 

 

 

4

 

 

 

3

 

 

2

 

 

 

1

 

 

0

 

 

Register

 

 

 

 

7

 

 

6

 

 

 

 

5

 

 

4

3

 

2

 

1

 

 

0

Data

 

 

 

 

-

 

-

 

-

 

 

 

-

 

-

 

-

 

 

-

 

 

-

 

 

Data

 

 

 

 

 

-

 

 

-

 

-

 

-

-

 

-

 

-

 

 

-

Feature

 

 

 

-

 

-

 

-

 

 

 

-

 

-

 

-

 

 

-

 

 

-

 

 

Error

 

 

 

 

 

 

 

 

 

 

 

...See Below...

 

 

 

 

Sector Count

 

 

 

 

V

V

V

V

V

 

 

V

V

V

 

Sector Count

 

 

 

 

V

 

V

V

 

V

 

 

V

 

V

 

V

 

 

V

LBA Low

 

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

LBA Low

 

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

V

 

 

V

LBA Mid

 

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

LBA Mid

 

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

V

 

 

V

LBA High

 

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

LBA High

 

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

V

 

 

V

Device

 

 

 

 

 

-

 

 

L

 

 

 

-

 

 

 

-

 

 

 

H

 

 

H

 

 

H

 

 

H

 

Device

 

 

 

 

 

-

 

 

-

 

 

 

 

-

 

 

-

 

 

H

 

H

 

H

 

 

H

Command

 

 

 

1

1

0

0

1

0

 

 

1

 

 

R

 

Status

 

 

 

 

 

 

 

 

 

 

 

...See Below...

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Error Register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Status Register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

6

5

4

 

3

 

 

 

 

2

 

 

 

 

1

 

 

 

 

0

 

 

 

 

 

7

 

6

5

 

4

3

 

 

 

 

2

 

 

 

1

 

 

0

 

CRC

 

UNC

0

IDN

 

0

 

 

 

 

ABT

 

T0N

 

 

 

AM

 

 

BSY

 

RDY

DF

 

DSC

DRQ

 

COR

 

 

IDX

 

ERR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

0

0

V

 

0

 

 

 

 

 

 

 

V

 

0

 

 

 

 

0

 

 

 

 

 

0

 

V

V

 

V

-

 

 

 

 

0

 

 

 

0

 

 

V

 

Table 127 Write DMA Command (CAh/CBh)

The Write DMA command transfers one or more sectors of data from the host to the device, then the data is written to the disk media.

The sectors of data are transferred through the Data Register 16 bits at a time.

The host initializes a slave-DMA channel prior to issuing the command. Data transfers are qualified by DMARQ and are performed by the slave-DMA channel. The device issues only one interrupt per command to indicate that data transfer has terminated and status is available.

If an uncorrectable error occurs, the write will be terminated at the failing sector.

Output Parameters To The Device

Sector Count

The number of continuous sectors to be transferred. If zero is specified, then 256 sectors

 

will be transferred.

LBA Low

The sector number of the first sector to be transferred. (L=0)

 

In LBA mode, this register contains LBA bits 0 - 7. (L=1)

LBA High/Mid

The cylinder number of the first sector to be transferred. (L=0)

 

In LBA mode, this register contains LBA bits 8 - 15 (Mid), 16 - 23 (High).

 

(L=1)

 

 

H

The head number of the first sector to be transferred. (L=0)

 

In LBA mode, this register contains LBA bits 24 - 27. (L=1)

R

The retry bit, but this bit is ignored.

Input Parameters From The Device

Sector Count

The number of requested sectors not transferred. This will be zero, unless

 

 

an unrecoverable error occurs.

 

 

LBA Low

The sector number of the last transferred sector. (L=0)

 

In LBA mode, this register contains current LBA bits 0 - 7. (L=1)

 

 

LBA High/Mid

The cylinder number of the last transferred sector. (L=0)

 

In LBA mode, this register contains current LBA bits 8 - 15 (Mid), 16 - 23 (High).

 

(L=1)

H

The head number of the last transferred sector. (L=0) In LBA mode, this register

 

contains current LBA bits 24 - 27. (L=1)

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Hitachi HDS723020BLA642 manual Write DMA CAh/CBh, Write DMA Command CAh/CBh
Page 158 Page 160

HDS723020BLA642 specifications

The Hitachi HDS723020BLA642 is a high-performance hard disk drive that exemplifies the balance between reliability and advanced technology, making it an excellent choice for a range of applications, from desktop computers to enterprise storage solutions. This 2TB SATA hard drive is designed to meet the growing data storage needs of users who demand both speed and efficiency.

One of the key features of the HDS723020BLA642 is its impressive rotational speed of 7200 RPM. This speed facilitates faster data access and improved overall performance, significantly enhancing the user experience during data-intensive operations such as gaming, video editing, and large file transfers. Coupled with a SATA III interface, this drive facilitates data transfer rates of up to 6 Gb/s, providing an efficient conduit for moving data quickly between the hard drive and the motherboard.

The drive comes equipped with a large 64 MB cache, which plays a crucial role in buffering read and write operations. This substantial amount of cache memory allows the drive to temporarily store frequently accessed data, leading to reduced latency and enabling smoother multitasking capabilities. Users will benefit from faster load times and reduced wait periods when working with large files.

Reliability is another defining characteristic of the HDS723020BLA642. Hitachi, now a part of Western Digital, has a longstanding reputation for producing durable hard drives. This model incorporates advanced technologies, such as the Fluid Dynamic Bearing (FDB) for quieter operation and better longevity. The drive also features an enhanced error recovery system that minimizes the risk of data loss, making it a suitable option for both personal and professional use.

In terms of power efficiency, the HDS723020BLA642 is designed to consume less power during operation compared to older hard drive models. This efficiency not only helps in reducing operational costs but also contributes to a longer lifespan for the drive itself.

Overall, the Hitachi HDS723020BLA642 hard drive combines speed, reliability, and efficiency into a compact package, making it an ideal choice for users needing a substantial amount of storage without compromising on performance. Whether for upgrading an existing system or building a new one, this drive offers a blend of technology and durability that caters to modern storage demands.