SST39VF6401 Silicon Storage Technology, Inc., SST39VF6401 Datasheet - Page 5

• Manufacturer Part Number: SST39VF6401
• Description: 64 Mbit X16 Multi-purpose Flash Plus
• Manufacturer: Silicon Storage Technology, Inc.

16 Mbit / 32 Mbit Multi-Purpose Flash Plus
SST39VF6401 / SST39VF6402
Product Identification
The Product Identification mode identifies the devices as
the SST39VF6401 or SST39VF6402, and manufacturer
as SST. This mode may be accessed software opera-
tions. 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 12
for the Software ID Entry and Read timing diagram and
Figure 22 for the Software ID Entry command sequence
flowchart.
TABLE 3: Product Identification
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 14 for timing waveform, and Figures 22 and
23 for flowcharts.
©2008 Silicon Storage Technology, Inc.
Manufacturer’s ID
Device ID
SST39VF6401
SST39VF6402
Address
0000H
0001H
0001H
T3.2 1223(03)
236BH
236AH
Data
BFH
5
Security ID
The SST39VF640x devices offer a 256-bit Security ID
space. The Secure ID space is divided into two 128-bit seg-
ments - one factory programmed segment and one user
programmed segment. The first segment is programmed
and locked at SST with a random 128-bit number. The user
segment is left un-programmed for the customer to pro-
gram 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 5555H in the last byte sequence. To exit
this mode, the Exit Sec ID command should be executed.
Refer to Table 6 for more details.
S71223(03)-00-EOL
EOL Data Sheet
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