SST55LD019A Silicon Storage Technology, Inc., SST55LD019A Datasheet - Page 39

• Manufacturer Part Number: SST55LD019A
• Description: Ata Flash Disk Controllersst's Ata Flash Disk Controller is The Heart of a High Performance, Flash Media-based Data Storage System. The Ata Flash Disk Controller Recognizes The Control, Address, And Data Signals on The Ata/ide Bus And Translates Them
• Manufacturer: Silicon Storage Technology, Inc.

ATA Flash Disk Controller
SST55LD019A / SST55LD019B / SST55LD019C
11.2.1.16 Read-Sector(s) - 20H or 21H
11.2.1.17 Read-Verify-Sector(s) - 40H or 41H
©2004 Silicon Storage Technology, Inc.
Command (7)
Command (7)
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 ATA Flash Disk Controller 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.
This command is identical to the Read-Sectors command, except that DRQ is never set and no data is
transferred to the host. When the command is accepted, the ATA Flash Disk Controller sets BSY.
When the requested sectors have been verified, the ATA Flash Disk Controller clears BSY and
generates an interrupt. Upon command completion, the Command Block registers contain the cylinder,
head, and sector number of the last sector verified.
If an error occurs, the verify 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
Sector Count register contains the number of sectors not yet verified.
Sec Num (3)
Sec Num (3)
Cyl High (5)
Cyl High (5)
Cyl Low (4)
Cyl Low (4)
Sec Cnt (2)
Sec Cnt (2)
Feature (1)
Feature (1)
C/D/H (6)
C/D/H (6)
Bit ->
Bit ->
7
1
7
1
LBA
LBA
6
6
5
1
5
1
39
Cylinder High (LBA 23-16)
Cylinder High (LBA 23-16)
Sector Number (LBA 7-0)
Sector Number (LBA 7-0)
Cylinder Low (LBA 15-8)
Cylinder Low (LBA 15-8)
Drive
Drive
4
4
Sector Count
Sector Count
20H or 21H
40H or 41H
X
X
3
3
Head (LBA 27-24)
Head (LBA 27-24)
2
2
Advance Information
1
1
S71241-02-000
0
0
4/04