©2012 Silicon Storage Technology, Inc.

DS25023B

06/13

9

1 Mbit / 2 Mbit / 4 Mbit Multi-Purpose Flash

SST39LF010 / SST39LF020 / SST39LF040

SST39VF010 / SST39VF020 / SST39VF040

Data Sheet

Software Data Protection (SDP)

The SST39LF010/020/040 and SST39VF010/020/040 provide the JEDEC approved Software Data

Protection scheme for all data alteration operation, i.e., Program and Erase. Any Program operation

requires the inclusion of a series of three-byte sequence. The three-byte load sequence is used to ini-

tiate the Program operation, providing optimal protection from inadvertent Write operations, e.g., dur-

ing the system power-up or power-down. Any Erase operation requires the inclusion of six-byte load

sequence. These devices are shipped with the Software Data Protection permanently enabled. See

Table 4 for the specific software command codes. During SDP command sequence, invalid commands

will abort the device to read mode, within TRC.

Product Identification

The Product Identification mode identifies the devices as the SST39LF/VF010, SST39LF/VF020, and

SST39LF/VF040 and manufacturer as SST. This mode may be accessed by software operations.

Users may use the Software Product Identification operation to identify the part (i.e., using the device

ID) when using multiple manufacturers in the same socket. For details, see Table 4 for software opera-

tion, Figure 11 for the Software ID Entry and Read timing diagram, and Figure 17 for the Software ID

entry command sequence flowchart.

Product Identification Mode Exit/Reset

In order to return to the standard Read mode, the Software Product Identification mode must be exited.

Exit is accomplished by issuing the Software ID Exit command sequence, which returns the device to

the Read operation. Please note that the Software ID Exit command is ignored during an internal Pro-

gram or Erase operation. See Table 4 for software command codes, Figure 12 for timing waveform,

and Figure 17 for a flowchart.

Table 2: Product Identification

Address

Data

Manufacturer’s ID

0000H

BFH

Device ID

SST39LF/VF010

0001H

D5H

SST39LF/VF020

0001H

D6H

SST39LF/VF040

0001H

D7H

T2.1 25023