SST85LD0256 datasheet(12/73 Pages) SST

12 / 73 page

Advance Information

NANDrive

SST85LD0128 / SST85LD0256 / SST85LD0512

S71319-03-000

2/07

7.0 CONFIGURABLE WRITE PROTECT/POWER-DOWN MODES

The WP_PD# pin can be used for either Write Protect

mode or Power-down mode, but only one mode is active at

any time. Either mode can be selected through the host

command, Set-WP_PD#-Mode, explained in Section

12.2.1.31.

Once the mode is set with this command, the device will

stay in the configured mode until the next time this

command is issued. Power-off or reset will not change the

configured mode.

7.1 Write Protect Mode

When the device is configured in the Write Protect mode,

the WP_PD# pin offers extended data protection. This

feature can be either selected through a jumper or host

logic to protect the stored data from inadvertent system

writes or erases, and viruses. The Write Protect feature

protects the full address space of the data stored on the

flash media.

In the Write Protect mode, the WP_PD# pin should be

asserted prior to issuing the destructive commands: Erase-

Sector,

Format-Track,

Write-DMA,

Write-Long-Sector,

Write-Multiple,

Write-Multiple-without-Erase,

Write-

Sector(s), Write-Sector-without-Erase, or Write-Verify. This

will force the NANDrive to reject any destructive commands

from the ATA interface. All destructive commands will return

51H in the Status register and 04H in the Error register

signifying

invalid

command.

All

non-destructive

commands will be executed normally.

7.2 Power-down Mode

When the device is configured in the Power-down mode, if

the WP_PD# pin is asserted during a command, the

NANDrive completes the current command and returns to

the standby mode immediately to save power. Afterwards,

the device will not accept any other commands. Only a

Power-on Reset (POR) or hardware reset will bring the

device to normal operation with the WP_PD# pin de-

asserted.

SST85LD0256 Datasheet(PDF) 12 Page - Silicon Storage Technology, Inc

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