SST55LD019C datasheet(49/79 Pages) SST

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Data Sheet

ATA Flash Disk Controller

SST55LD019A / SST55LD019B / SST55LD019C

S71241-04-000

12/06

Device performance may increase with increasing power management levels. Device power

consumption may increase with increasing power management levels. The power management levels

may contain discrete bands. For example, a ATA Flash Disk Controller may implement one power

management method from 80H to A0H and a higher performance, higher power consumption method

from level A1H to FEH.

Feature 85H disables Advanced Power Management. Subcommand 85H may not be implemented on

all devices that implement Set Features subcommand 05H.

Features 0AH and 8AH are used to enable and disable Power Level 1 commands. Feature 0AH is the

default feature for the ATA Flash Disk Controller with extended power.

Features 55H and BBH are the default features for the ATA Flash Disk Controller; thus, the host does

not have to issue this command with these features unless it is necessary for compatibility reasons.

Feature code 9AH enables the host to configure the device to best meet the host system’s power

requirements. The host sets a value in the Sector Count register that is equal to one-fourth of the

desired maximum average current (in mA) that the device should consume. For example, if the Sector

Count register is set to 6, the device would be configured to provide the best possible performance

without exceeding 24 mA. Upon completion of the command, the device responds to the host with the

range of values supported by the device. The minimum value is set in the Cylinder Low register, and the

maximum value is set in the Cylinder High register. The default value, after a power on reset, is to

operate at the highest performance and therefore the highest current mode.

The device will accept values outside this programmable range, but will operate either at the lowest

power or highest performance as appropriate.

Features 66H and CCH can be used to enable and disable whether the Power-on Reset (POR) Defaults

will be set when a software reset occurs.

11.2.1.28 Set-Max - F9H

Individual Set-Max commands are identified by the value placed in the Features register. Table 11-12 shows these

Features register values.

TABLE11-11:Transfer Mode Values

Mode

Bits [7:3]

Bits [2:0]

PIO default mode

00000b

000b

PIO default mode, disable IORDY

00000b

001b

PIO flow control transfer mode

00001b

mode1

1. Mode = transfer mode number, all other values are not valid

Multi-word DMA mode

00100b

mode1

Reserved

Other

N/A

T11-11.0 1241

TABLE11-12:Set-Max Features register values

Value

Command

00H

Obsolete

01H

Set-Max-Set-Password

02H

Set-Max-Lock

03H

Set-Max-Unlock

04H

Set-Max-Freeze-Lock

05H-FFH

Reserved

T11-12.0 1241

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