HANBit

HFDOM40KVxxx

URL:www.hbe.co.kr

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HANBit Electronics Co., Ltd.

Rev. 1.1 (December, 2003)

The Read Long command performs similarly to the Read Sector(s) command except that it returns 516 bytes of

data instead of 512 bytes. During a Read Long command, the CompactFlash Storage Card does not check the

ECC bytes to determine if there has been a data error. Only single sector read long operations are supported. The

transfer consists of 512 bytes of data transferred in word mode followed by 4 bytes of ECC data transferred in byte

mode. This command has the same protocol as the Read Sector(s) command. Use of this command is not

recommended.

Read Sector(s) – 20h or 21h

Bit->

7

6

5

4

3

2

1

0

Command(7)

20h – 21h

C/D/H(6)

1

LBA

1

Drive

Head(LBA 27 – 24)

Cyl High(5)

Cylinder High (LBA 23 – 16)

Cyl Low(4)

Cylinder Low (15 – 8)

Sec Num(3)

Sector Number (LBA 7 – 0)

Sec Cnt(2)

Sector Count

Feature(1)

X

Read Sector(s)

This command reads from 1 to 256 sectors as specified in the Sector Count register. A sector count of 0 requests

256 sectors. The transfer begins at the sector specified in the Sector Number Register. When this command is

issued and after each sector of data (except the last one) has been read by the host, the CompactFlash Storage

Card sets BSY, puts the sector of data in the buffer, sets DRQ, clears BSY, and generates an interrupt. The host

then reads the 512 bytes of data from the buffer.

At command completion, the Command Block Registers contain the cylinder, head and sector number of the last

sector read. If an error occurs, the read terminates at the sector where the error occurred. The Command Block

Registers contain the cylinder, head, and sector number of the sector where the error occurred. The flawed data is

pending in the sector buffer.

Read Verify Sector(s) – 40h or 41h

Bit->

7

6

5

4

3

2

1

0

Command(7)

40h – 41h

C/D/H(6)

1

LBA

1

Drive

Head(LBA 27 – 24)

Cyl High(5)

Cylinder High (LBA 23 – 16)

Cyl Low(4)

Cylinder Low (15 – 8)

Sec Num(3)

Sector Number (LBA 7 – 0)

Sec Cnt(2)

Sector Count

Feature(1)

X

Read Verify Sector(s)

This command is identical to the Read Sectors command, except that DRQ is never set and no data is transferred

to the host. When the command is accepted, the CompactFlash Storage Card sets BSY.

When the requested sectors have been verified, the CompactFlash Storage Card clears BSY and generates an

interrupt. Upon command completion, the Command Block Registers contain the cylinder, head, and sector

number of the last sector verified.

If an error occurs, the verify terminates at the sector where the error occurs. The Command Block Registers

contain the cylinder, head and sector number of the sector where the error occurred. The Sector Count Register

contains the number of sectors not yet verified.