SST55LD019C-45-C-MVWE View Datasheet(PDF) - Silicon Storage Technology

Part Name

Description

MFG CO.

SST55LD019C-45-C-MVWE

ATA Flash Disk Controller

Silicon Storage Technology 

ATA Flash Disk Controller

SST55LD019A / SST55LD019B / SST55LD019C

Data Sheet

8.0 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 11.2.1.31.

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.

8.1 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 ATA Flash Disk Controller 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 an invalid

command. All non-destructive commands will be executed normally.

8.2 Power-down Mode

When the device is configured in the Power-down mode, if the WP_PD# pin is asserted during a command, the ATA disk

controller 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.

©2006 Silicon Storage Technology, Inc.

17

S71241-04-000

12/06

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