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203 Series Industrial Grade 2.5" FlashDrive Product Manual v2.0Cactus Technologies

5.1.28. Write Sector(s)-30H, 31H

The Write Sectors command in Table 5-41 writes from 1 to 256 sectors as specied in the Sector

Count Register. A sector count of zero requests 256 sectors. The transfer begins at the sector

specied in the Sector Number Register. When this command is accepted, the drive sets BSY, then

sets DRQ and clears BSY, then waits for the host to ll the sector buer with the data to be written.

No interrupt is generated to start the rst buer ll operation. No data should be transferred by the

host until BSY has been cleared by the host.

Bit -> 7 6 5 4 3 2 1 0

Command (7)

30H or 31H

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)

Sector Count

Feature (1)

Table 5-41. Write Sectors

For multiple sectors, after the rst sector of data is in the buer, BSY will be set and DRQ will

be cleared. After the next buer is ready for data, BSY is cleared, DRQ is set and an interrupt is

generated. When the nal 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.

5.1.29. Write Sector(s) without Erase-38H

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

performed.