©2002-2016

DS20005022C

04/16

9

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

SST39SF010A / SST39SF020A / SST39SF040

Data Sheet

Software Data Protection (SDP)

The SST39SF010A/020A/040 provide the JEDEC approved Software Data Protection scheme for all

data alteration operations, 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 initiate the Program operation,

providing optimal protection from inadvertent Write operations, e.g., during the system power-up or

power-down. Any Erase operation requires the inclusion of six-byte load sequence. The

SST39SF010A/020A/040 devices are shipped with the Software Data Protection permanently

enabled. See Table 4 for the specific software command codes. During SDP command sequence,

Product Identification

The Product Identification mode identifies the device as the SST39SF040, SST39SF010A, or

SST39SF020A and manufacturer as SST. This mode may be accessed by software operations. Users

may wish to 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, Table 4 for software operation,

Figure 12 for the software ID entry and read timing diagram and Figure 18 for the 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 Exit ID command sequence, which returns the device to the Read

operation. Please note that the software reset command is ignored during an internal Program or

Erase operation. See Table 4 for software command codes, Figure 13 for timing waveform and Figure

18 for a flowchart.

Table 2: Product Identification

Address

Data

Manufacturer’s ID

0000H

BFH

Device ID

SST39SF010A

0001H

B5H

SST39SF020A

0001H

B6H

SST39SF040

0001H

B7H

T2.2 25022