SST39VF3201B datasheet(5/29 Pages) MICROCHIP

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Data Sheet

32 Mbit Multi-Purpose Flash Plus

SST39VF3201B / SST39VF3202B

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

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