Datasheet

Data Sheet
32 Mbit Multi-Purpose Flash Plus
SST39VF3201B / SST39VF3202B
5
©2009 Silicon Storage Technology, Inc. S71384-01-000 1/09
Product Identification
The Product Identification mode identifies the devices as
the SST39VF3201B and SST39VF3202B, and the manu-
facturer as SST. This mode may be accessed through
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 6 for software operation,
Figure 13 for the Software ID Entry and Read timing dia-
gram and Figure 23 for the Software ID Entry command
sequence flowchart.
Product Identification Mode Exit/
CFI Mode Exit
In order to return to the standard Read mode, the Software
Product Identification mode must be exited. Exit is accom-
plished by issuing the Software ID Exit command
sequence, which returns the device to the Read mode.
This command may also be used to reset the device to the
Read mode after any inadvertent transient condition that
apparently causes the device to behave abnormally, e.g.,
not read correctly. Please note that the Software ID Exit/
CFI Exit command is ignored during an internal Program or
Erase operation. See Table 6 for software command
codes, Figure 15 for timing waveform, and Figure 23 and
Figure 24 for flowcharts.
Security ID
The SST39VF320xB devices offer a 136 word Security ID
space. The Secure ID space is divided into two segments -
one factory programmed segment and one user pro-
grammed segment. The first segment is programmed and
locked at SST with a random 128-bit number. The 128-
word user segment is left un-programmed for the customer
to program as desired.
To program the user segment of the Security ID, the user
must use the Security ID Word-Program command. To
detect end-of-write for the SEC ID, read the toggle bits. Do
not use Data# Polling. Once this is complete, the Sec ID
should be locked using the User Sec ID Program Lock-Out.
This disables any future corruption of this space. Note that
regardless of whether or not the Sec ID is locked, neither
Sec ID segment can be erased.
The Secure ID space can be queried by executing a three-
byte command sequence with Enter Sec ID command
(88H) at address 555H in the last byte sequence. To exit
this mode, the Exit Sec ID command should be executed.
Refer to Table 6 for more details.
TABLE 3: Product Identification
Address Data
Manufacturer’s ID 0000H BFH
Device ID
SST39VF3201B 0001H 235DH
SST39VF3202B 0001H 235CH
T3.0 1384