SST39VF6401B-70-4C-B1K SST [Silicon Storage Technology, Inc], SST39VF6401B-70-4C-B1K Datasheet - Page 5

• Manufacturer Part Number: SST39VF6401B-70-4C-B1K
• Description: 64 Mbit (x16) Multi-Purpose Flash Plus
• Manufacturer: SST [Silicon Storage Technology, Inc]

64 Mbit Multi-Purpose Flash Plus
SST39VF6401B / SST39VF6402B
Product Identification
The Product Identification mode identifies the devices as
the SST39VF6401B and SST39VF6402B, 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 11 for the Software ID Entry and Read timing dia-
gram and Figure 21 for the Software ID Entry command
sequence flowchart.
TABLE 3: P
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 13 for timing waveform, and Figures 21 and
22 for flowcharts.
©2006 Silicon Storage Technology, Inc.
Manufacturer’s ID
Device ID
SST39VF6401B
SST39VF6402B
RODUCT
I
DENTIFICATION
Address
0000H
0001H
0001H
236DH
236CH
Data
BFH
T3.0 1288
5
Security ID
The SST39VF640xB 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 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.
S71288-02-000
Data Sheet
7/06