SST55LD019C datasheet(21/79 Pages) SST

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Data Sheet

ATA Flash Disk Controller

SST55LD019A / SST55LD019B / SST55LD019C

S71241-04-000

12/06

11.1.2.3 Feature Register (Write Only)

This register provides information regarding features of the ATA Flash Disk Controller that the host can utilize.

11.1.2.4 Sector Count Register

This register contains the numbers of sectors of data requested to be transferred on a Read or Write operation between the

host and the ATA Flash Disk Controller. If the value in this register is zero, a count of 256 sectors is specified. If the command

was successful, this register is zero at command completion. If not successfully completed, the register contains the number

of sectors that need to be transferred in order to complete the request.

11.1.2.5 Sector Number (LBA 7-0) Register

This register contains the starting sector number or bits 7-0 of the Logical Block Address (LBA) for any ATA Flash Disk Con-

troller data access for the subsequent command.

11.1.2.6 Cylinder Low (LBA 15-8) Register

This register contains the low order 8 bits of the starting cylinder address or bits 15-8 of the Logical Block Address.

11.1.2.7 Cylinder High (LBA 23-16) Register

This register contains the high order bits of the starting cylinder address or bits 23-16 of the Logical Block Address.

11.1.2.8 Drive/Head (LBA 27-24) Register

The Drive/Head register is used to select the drive and head. It is also used to select LBA addressing instead of cylinder/

head/sector addressing. The bits are defined as follows:

Symbol

Function

LBA

LBA is a flag to select either Cylinder/Head/Sector (CHS) or Logical Block Address mode (LBA).

When LBA=0, Cylinder/Head/Sector mode is selected. When LBA=1, Logical Block Address is

selected. In Logical Block mode, the Logical Block Address is interpreted as follows:

LBA7-LBA0: Sector Number register D7-D0.

LBA15-LBA8: Cylinder Low register D7-D0.

LBA23-LBA16: Cylinder High register D7-D0.

LBA27-LBA24: Drive/Head register bits HS3-HS0.

DRV

DRV is the drive number. When DRV=0 (Master), Master is selected.

When DRV=1 (Slave), Slave is selected.

HS3

When operating in the Cylinder, Head, Sector mode, this is bit 3 of the head number.

It is Bit 27 in the Logical Block Address mode.

HS2

When operating in the Cylinder, Head, Sector mode, this is bit 2 of the head number.

It is Bit 26 in the Logical Block Address mode.

HS1

When operating in the Cylinder, Head, Sector mode, this is bit 1 of the head number.

It is Bit 25 in the Logical Block Address mode.

HS0

When operating in the Cylinder, Head, Sector mode, this is bit 0 of the head number.

It is Bit 24 in the Logical Block Address mode.

Reset Value

1LBA

DRV

HS3

HS2

HS1

HS0

1010 0000b

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