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300/300-P Series Industrial Grade SSD Product Manual v2.0Cactus Technologies

DRQ qualication 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 nal, 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.

5.1.27. Write Multiple without Erase-CDH

This command is similar to the Write Multiple command except that an implied erase is not

performed.

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)

Table 5-40. Write Multiple without Erase