HANBit

HFDOM44S3Rxxx

URL:www.hbe.co.kr

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HANBit Electronics Co., Ltd.

Rev. 1.0 (January, 2005)

number of blocks or the block count) requested. If the number of requested

sectors is not evenly divisible by the sector/block, as many full blocks as possible are transferred, followed by a

final, partial block transfer. The partial block transfer is for n sectors, where:

n = remainder ( sector count / block count ). If the Write Multiple command is attempted before the Set Multiple

Mode command has been executed or when Write Multiple commands are disabled, the Write Multiple operation

will be rejected with an aborted command error.

Errors encountered during Write Multiple commands are posted after the attempted writes of the block or partial

block transferred. The Write command ends with the sector in error, even if it is in the middle of a block.

Subsequent blocks are not transferred in the event of an error. Interrupts are generated when DRQ is set at the

beginning of each block or partial block.

The Command Block Registers contain the cylinder, head and sector number of the sector where the error

occurred and the Sector Count Register contains the residual number of sectors that need to be transferred for

successful completion of the command, e.g., each block has 4 sectors, a request for 8 sectors is issued and an

error occurs on the third sector. The Sector Count Register contains 6 and the address is that of the third sector.

Write Multiple without Erase – CDh

Bit->

7

6

5

4

3

2

1

0

Command(7)

CDh

C/D/H(6)

X

LBA

X

Drive

Head

Cyl High(5)

Cylinder High

Cyl Low(4)

Cylinder Low

Sec Num(3)

Sector Number

Sec Cnt(2)

Sector Count

Feature(1)

X

Write Multiple without Erase

This command is similar to the Write Multiple command with the exception that an implied erase before write

operation is not performed. The sectors should be pre-erased with the Erase Sector(s) command before this

command is issued.

Write Sector(s) – 30h or 31h

Bit->

7

6

5

4

3

2

1

0

Command(7)

30h or 31h

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

Write Sector(s)

This command writes from 1 to 256 sectors as specified in the Sector Count Register. A sector count of zero

requests 256 sectors. The transfer begins at the sector specified in the Sector

Number Register. When this command is accepted, the CompactFlash Storage Card sets BSY,then sets DRQ and

clears BSY, then waits for the host to fill the sector buffer with the data to be written. No interrupt is generated to

start the first host transfer operation. No data should be transferred by the host until BSY has been cleared by the

host.

For multiple sectors, after the first sector of data is in the buffer, BSY will be set and DRQ will be cleared. After the

next buffer is ready for data, BSY is cleared, DRQ is set and an interrupt is generated. When the final sector of

data is transferred, BSY is set and DRQ is cleared. It will remain in this state until the command is completed at