SST48CF032 datasheet(53/60 Pages) SST

53 / 60 page

Data Sheet

CompactFlash Card

SST48CF008 / 016 / 024 / 032 / 048 / 064 / 096 / 128 / 192 / 256

S71125-03-000

9/01

375

3.2.1.26 Write Multiple Command - C5H

Note: The current revision of the SST CompactFlash card can support up to a block count of 1 as indicated in the Identify Drive

Command information

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

ns 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.

Bit ->

Command (7)

C5H

C/D/H (6)

LBA

Drive

Head

Cyl High (5)

Cylinder High

Cyl Low (4)

Cylinder Low

Sec Num (3)

Sector Number

Sec Cnt (2)

Sector Count

Feature (1)

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