FT28C010 datasheet(7/30 Pages) FORCE

7 / 30 page

HARDWARE DATA PROTECTION

The FT28C010 provides three hardware features that

protect nonvolatile data from inadvertent writes.

• Noise Protection—A WE pulse less than 10ns will not

initiate a write cycle.

• Default VCC Sense—All functions are inhibited when

VCC is ≤3.5V.

• Write inhibit—Holding eitherOE LOW, WE HIGH, or

HIGH will prevent an inadvertent write cycle

during power-up and power-down, maintaining data

integrity.

SOFTWARE DATA PROTECTION

The FT28C010 offers a software controlled data protec-

tion feature. The FT28C010 is shipped from Force with the

software data protection NOT ENABLED: that is the

device will be in the standard operating mode. In this

mode data should be protected during power-up/-down

operations through the use of external circuits. The host

would then have open read and write access of the

device once VCC was stable.

The FT28C010 can be automatically protected during

power-up and power-down without the need for external

circuits by employing the software data protection fea-

ture. The internal software data protection circuit is

enabled after the first write operation utilising the soft-

ware algorithm. This circuit is nonvolatile and will remain

set for the life of the device unless the reset command

is issued.

Once the software protection is enabled, the FT28C010

is also protected from inadvertent and accidental writes

in the powered-up state. That is, the software algorithm

must be issued prior to writing additional data to the

device.

SOFTWARE ALGORITHM

Selecting the software data protection mode requires

the host system to precede data write operations by a

series of three write operations to three specific ad-

dresses. Refer to Figures 6 and 7 for the sequence. The

three byte sequence opens the page write window

enabling the host to write from one to two hundred fifty-

six bytes of data. Once the page load cycle has been

completed, the device will automatically be returned to

the data protected state.

FT28C010-xxxxx-X

Rev 1.1

7/30

2011

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