SST39LF100 データシートの表示（PDF） - Silicon Storage Technology

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SST39LF100

1 Mbit (64K x16) Multi-Purpose Flash

Silicon Storage Technology 

1 Mbit Multi-Purpose Flash

SST39LF100 / SST39VF100

Data Sheet

Toggle Bit (DQ6)

During the internal Program or Erase operation, any con-

secutive attempts to read DQ6 will produce alternating 1s

and 0s, i.e., toggling between 1 and 0. When the internal

Program or Erase operation is completed, the DQ6 bit will

stop toggling. The device is then ready for the next opera-

tion. The Toggle Bit is valid after the rising edge of fourth

WE# (or CE#) pulse for Program operation. For Sector- or

Chip-Erase, the Toggle Bit is valid after the rising edge of

sixth WE# (or CE#) pulse. See Figure 6 for Toggle Bit tim-

ing diagram and Figure 14 for a flowchart.

Data Protection

The SST39LF/VF100 provide both hardware and software

features to protect nonvolatile data from inadvertent writes.

Hardware Data Protection

Noise/Glitch Protection: A WE# or CE# pulse of less than 5

ns will not initiate a Write cycle.

VDD Power Up/Down Detection: The Write operation is

inhibited when VDD is less than 1.5V.

Write Inhibit Mode: Forcing OE# low, CE# high, or WE#

high will inhibit the Write operation. This prevents inadvert-

ent Writes during power-up or power-down.

Software Data Protection (SDP)

The SST39LF/VF100 provide the JEDEC approved Soft-

ware Data Protection scheme for all data alteration opera-

tions, i.e., Program and Erase. Any Program operation

requires the inclusion of the 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 sequence. The SST39LF/VF100 devices are

shipped with the Software Data Protection permanently

enabled. See Table 4 for the specific software command

codes. During SDP command sequence, invalid com-

mands will abort the device to Read mode within TRC. The

contents of DQ15-DQ8 are “Don’t Care” during any SDP

command sequence.

Product Identification

The Product Identification mode identifies the devices as

SST39LF100 and SST39VF100 and manufacturer as SST.

This mode may be accessed by software operations.

Users may use the Software Product Identification opera-

tion to identify the part (i.e., using the device ID) when using

multiple manufacturers in the same socket. For details, see

Table 4 for software operation, Figure 9 for the Software ID

Entry and Read timing diagram, and Figure 15 for the Soft-

ware ID Entry command sequence flowchart.

TABLE 1: PRODUCT IDENTIFICATION

Manufacturer’s ID

Device ID

SST39LF/VF100

Address

0000H

0001H

Data

00BFH

2788H

T1.3 363

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 4 for software command

codes, Figure 10 for timing waveform and Figure 15 for a

flowchart.

©2001 Silicon Storage Technology, Inc.

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S71129-02-000 6/01 363

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