FT29F010B datasheet(9/30 Pages) FORCE

9 / 30 page

Table 3.

FT29F010B Autoselect Codes (High Voltage Method)

L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.

Description

CE#

OE#

WE#

A16

A14

A13

A10

DQ7

DQ0

Manufacturer ID: Spansion

VID

01h

Device ID: FT29F010B

VID

20h

Sector Protection Verification

VID

01h

(protected)

00h

(unprotected)

Sector Protection/Unprotection

The hardware sector protection feature dis ables both

program and erase operations in any sector. The hard-

ware sector unprotection feature re-enables both

program and erase operations in previously protected

sectors.

Sector protection/unprotection must be implemented

using programming equipment. The pr ocedure re-

quires a high voltage (VID) on address pin A9 and the

control pins.

The device is shipped with all sectors unprotected.

It is possible to determine whether a sector is protected

or unprotected. See “Autoselect Mode” for details.

Hardware Data Protection

The command sequence requirement of unlock cycles

for programming or e rasing provides data protection

against inadvertent writes (refer to the Command Defi-

nitions table). In addition, the following hardware data

protection measures prevent accidental erasure or pro-

gramming, which mi ght otherwise b e caused by

spurious system level signals during VCC power-up

and power-down transitions, or from system noise.

Low VCC Write Inhibit

When VCC is less than VLKO, the device does not ac-

cept any write cycles. This protects data during VCC

power-up and power-down. The command register and

all internal program/erase circuits are disabled, and the

device resets. Subsequent writes are ignored until VCC

is greater than VLKO. The system must provide the

proper signals to the control pins to prevent uninten-

tional writes when VCC is greater than VLKO.

Write Pulse “Glitch” Protection

Noise pulses of less than 5 ns (typical) on OE#, CE# or

WE# do not initiate a write cycle.

Logical Inhibit

Write cycles are inhibited by holding any one of OE# =

VIL, CE# = VIH or WE# = VIH. To initiate a write cycle,

CE# and WE# must be a lo gical zero while OE# is a

logical one.

Power-Up Write Inhibit

If WE# = CE# = VIL and OE# = VIH during power up, the

device does not accept commands on the rising edge

of WE#. The internal state machine is automatically

reset to reading array data on power-up.

Rev 2

9/30

2014

FT29F010B Datasheet(PDF) 9 Page - Force Technologies Ltd

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