User Manual

ATA Command Description

5-20 CompactFlash

5.1.25. Write Long Sector—32H, 33H

Table 5-31. Write Long Sector

Bit -> 7 6 5 4 3 2 1 0

Command (7) 32H or 33H

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 (LBA 15-8)

Sec Num (3) Sector Number (LBA 7-0)

Sec Cnt (2) X

Feature (1) X

This command is provided for compatibility purposes and is similar to the Write Sector(s) command except that it

writes 516 bytes instead of 512 bytes. Only single sector Write Long operations are supported. The transfer consists

of 512 bytes of data transferred in word mode followed by 4 bytes of ECC transferred in byte mode. Because of the

unique nature of the solid-state CompactFlash Memory Card, the four bytes of ECC transferred by the host cannot

be used by the CompactFlash Card. The CompactFlash Card discards these four bytes and writes the sector with

valid ECC fields. This command has the same protocol as the Write Sector(s) command.

5.1.26. Write Multiple Command—C5H

Table 5-32. Write Multiple Command

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

NOTE: The current revision of the CompactFlash Memory 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

that may support a larger block count.

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

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

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.