SST48CF024 datasheet(54/60 Pages) SST

54 / 60 page

Data Sheet

CompactFlash Card

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

S71125-03-000

9/01

375

3.2.1.27 Write Multiple without Erase - CDH

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.

3.2.1.28 Write Sector(s) - 30H or 31H

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 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 which time BSY is cleared and an interrupt is generated.

If an error occurs during a write of more than one sector, writing terminates at the sector where the

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

where the error occurred. The host may then read the command block to determine what error has

occurred, and on which sector.

Bit ->

Command (7)

CDH

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)

Bit ->

Command (7)

30H or 31H

C/D/H (6)

LBA

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)

Feature (1)

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