SST55LD019C datasheet(39/79 Pages) SST

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Data Sheet

ATA Flash Disk Controller

SST55LD019A / SST55LD019B / SST55LD019C

S71241-04-000

12/06

Aborted Command error. Disk errors encountered during Read-Multiple commands are posted at the

beginning of the block or partial block transfer, but DRQ is still set and the data transfer will take place

as it normally would, including transfer of corrupted data, if any.

Interrupts are generated when DRQ is set at the beginning of each block or partial block. The error

reporting is the same as that on a Read-Sector(s) command. This command reads from 1 to 256

sectors as specified in the Sector Count register. A sector count of 0 requests 256 sectors. The transfer

begins at the sector specified in the Sector Number register.

At command completion, the Command Block registers contain the cylinder, head and sector number of

the last sector read.

If an error occurs, the read terminates at the sector where the error occurred. The Command Block

registers contain the cylinder, head and sector number of the sector where the error occurred. The

flawed data is pending in the sector buffer.

Subsequent blocks or partial blocks are transferred only if the error was a correctable data error. All

other errors cause the command to stop after transfer of the block which contained the error.

11.2.1.14 Read-Long-Sector - 22H or 23H

The Read-Long-Sector command performs similarly to the Read-Sector(s) command except that it

returns 516 Bytes of data instead of 512 Bytes. During a Read-Long-Sector command, the ATA Flash

Disk Controller does not check the ECC bytes to determine if there has been a data error. Only single-

sector Read-Long-Sector operations are supported. The transfer consists of 512 Bytes of data

transferred in Word-Mode followed by 4 Bytes of ECC data transferred in Byte-Mode. This command

has the same protocol as the Read-Sector(s) command. Use of this command is not recommended.

Bit ->

76543210

Command (7)

22H or 23H

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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