SST55LD019A Silicon Storage Technology, Inc., SST55LD019A Datasheet - Page 15

• 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
7.0 SECURITY FEATURES
The SST55LD019A/B/C ATA Flash Disk Controller offers added data protection for applications where data security
is of the utmost importance. The secure features are:
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 com-
mand 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 fea-
ture 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 com-
mands 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. After-
wards, 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.
©2004 Silicon Storage Technology, Inc.
1. Protection zones - Customer can enable up to 4 independent protection zones, with two options: Read-only or
2. Password protection - Accessing information within the protected zones can be only achieved through a
3. Purge command - The system can issue a Purge command to erase all information stored in the flash media.
Hidden (Read and Write protected) within each protected zone. If protection zones are not enabled the data is
unprotected (default configuration).
customer-unique password.
15
Advance Information
S71241-02-000
4/04