SST58LM032 datasheet(27/40 Pages) SST

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Advance Information

ATA-Disk Module

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S71193-01-000

9/01

519

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.

3.2.1.10 Read Long Sector - 22H or 23H

The Read Long 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 command, the ADM does not check the ECC

bytes to determine if there has been a data error. Only single sector read long 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.

3.2.1.11 Read Sectors - 20H or 21H

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.

When this command is issued and after each sector of data (except the last one) has been read by the

host, the ADM sets BSY, puts the sector of data in the buffer, sets DRQ, clears BSY, and generates an

interrupt. The host then reads the 512 Bytes of data from the buffer.

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.

Bit ->

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)

Bit ->

Command (7)

20H or 21H

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)

Sector Count

Feature (1)

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