HANBit

HFDOM40KRxxx

URL:www.hbe.co.kr

27 / 27

HANBit Electronics Co., Ltd.

Rev. 1.2 (Decemver. 2003)

recommended.

Write Multiple Command – C5h

Bit->

7

6

5

4

3

2

1

0

Command(7)

C5h

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 Command

Note: The current revision of the CompactFlash Storage Card only supports a block count of 1 as indicated in the

Identify Drive Command information. This command is provided for compatibility with future products which may

support a larger block count.

This command is similar to the Write Sectors command. The CompactFlash Storage Card sets BSY within 400

nsec of accepting the command. Interrupts are not presented on each sector but on the transfer of a block which

contains the number of sectors defined by Set Multiple.

Command execution is identical to the Write Sectors operation except that the number of sectors defined by the

Set Multiple command is transferred without intervening interrupts.

DRQ qualification of the transfer is required only at the start of the data block, not on each sector. The block count

of sectors to be transferred without intervening interrupts is programmed by the Set Multiple Mode command,

which must be executed prior to the Write Multiple command.

When the Write Multiple command is issued, the Sector Count Register contains the number of sectors (not the

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