SST39SF040 datasheet(3/24 Pages) SST

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Data Sheet

1 Mbit / 2 Mbit / 4 Mbit Multi-Purpose Flash

SST39SF010A / SST39SF020A / SST39SF040

S71147-06-000

8/04

Data# Polling (DQ7)

When the SST39SF010A/020A/040 are in the internal Pro-

gram operation, any attempt to read DQ7 will produce the

complement of the true data. Once the Program operation

is completed, DQ7 will produce true data. Note that even

though DQ7 may have valid data immediately following the

completion of an internal Write operation, the remaining

data outputs may still be invalid: valid data on the entire

data bus will appear in subsequent successive Read

cycles after an interval of 1 µs. During internal Erase opera-

tion, any attempt to read DQ7 will produce a ‘0’. Once the

internal Erase operation is completed, DQ7 will produce a

‘1’. The Data# Polling is valid after the rising edge of fourth

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

Chip-Erase, the Data# Polling is valid after the rising edge

of sixth WE# (or CE#) pulse. See Figure 7 for Data# Polling

timing diagram and Figure 16 for a flowchart.

Toggle Bit (DQ6)

During the internal Program or Erase operation, any con-

secutive attempts to read DQ6 will produce alternating 0s

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

Program or Erase operation is completed, the toggling will

stop. The device is then ready for the next operation. 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 8 for Toggle Bit timing dia-

gram and Figure 16 for a flowchart.

Data Protection

The SST39SF010A/020A/040 provide both hardware and

software features to protect nonvolatile data from inadvert-

ent 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 2.5V.

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

SST39SF010A/020A/040

provide

the

JEDEC

approved Software Data Protection scheme for all data

alteration operations, i.e., Program and Erase. Any Pro-

gram operation requires the inclusion of a series of 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 load sequence. The SST39SF010A/

020A/040 devices are shipped with the Software Data Pro-

tection permanently enabled. See Table 4 for the specific

software

command

codes.

During

SDP

command

sequence, invalid commands will abort the device to read

mode, within TRC.

Product Identification

The Product Identification mode identifies the device as the

SST39SF040, SST39SF010A, or SST39SF020A and

manufacturer as SST. This mode may be accessed by soft-

ware operations. Users may wish to use the software Prod-

uct Identification operation to identify the part (i.e., using the

device ID) when using multiple manufacturers in the same

socket. For details, Table 4 for software operation, Figure

11 for the software ID entry and read timing diagram and

Figure 17 for the ID entry command sequence flowchart.

Product Identification Mode Exit/Reset

In order to return to the standard Read mode, the Software

Product Identification mode must be exited. Exit is accom-

plished by issuing the Exit ID command sequence, which

returns the device to the Read operation. Please note that

the software reset command is ignored during an internal

Program or Erase operation. See Table 4 for software com-

mand codes, Figure 12 for timing waveform and Figure 17

for a flowchart.

TABLE

1: PRODUCT IDENTIFICATION

Address

Data

Manufacturer’s ID

0000H

BFH

Device ID

SST39SF010A

0001H

B5H

SST39SF020A

0001H

B6H

SST39SF040

0001H

B7H

T1.2 1147

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