MX29F800B 데이터 시트보기 (PDF) - Macronix International

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MX29F800B

8M-BIT [1Mx8/512Kx16] CMOS FLASH MEMORY

Macronix International 

MX29F800T/B

SECTOR PROTECTION

The MX29F800T/B features hardware sector protection.

This feature will disable both program and erase opera-

tions for these sectors protected. To activate this mode,

the programming equipment must force VID on address

pin A9 and control pin OE, (suggest VID = 12V) A6 =

VIL and CE = VIL.(see Table 2) Programming of the

protection circuitry begins on the falling edge of the WE

pulse and is terminated on the rising edge. Please refer

to sector protect algorithm and waveform.

To verify programming of the protection circuitry, the pro-

gramming equipment must force VID on address pin A9

( with CE and OE at VIL and WE at VIH). When A1=1, it

will produce a logical "1" code at device output Q0 for a

protected sector. Otherwise the device will produce 00H

for the unprotected sector. In this mode, the

addresses,except for A1, are don't care. Address loca-

tions with A1 = VIL are reserved to read manufacturer

and device codes.(Read Silicon ID)

It is also possible to determine if the sector is protected

in the system by writing a Read Silicon ID command.

Performing a read operation with A1=VIH, it will pro-

duce a logical "1" at Q0 for the protected sector.

CHIP UNPROTECT

The MX29F800T/B also features the chip unprotect

mode, so that all sectors are unprotected after chip

unprotect is completed to incorporate any changes in

the code. It is recommended to protect all sectors before

activating chip unprotect mode.

To activate this mode, the programming equipment

must force VID on control pin OE and address pin A9.

The CE pins must be set at VIL. Pins A6 must be set to

VIH.(see Table 2) Refer to chip unprotect algorithm and

waveform for the chip unprotect algorithm. The

unprotection mechanism begins on the falling edge of

the WE pulse and is terminated on the rising edge.

It is also possible to determine if the chip is unprotected

in the system by writing the Read Silicon ID command.

Performing a read operation with A1=VIH, it will produce

00H at data outputs(Q0-Q7) for an unprotected sector.

It is noted that all sectors are unprotected after the chip

unprotect algorithm is completed.

POWER-UP SEQUENCE

The MX29F800T/B powers up in the Read only mode.

In addition, the memory contents may only be altered

after successful completion of the predefined command

sequences.

ABSOLUTE MAXIMUM RATINGS

RATING

Ambient Operating Temperature

Storage Temperature

Applied Input Voltage

Applied Output Voltage

VCC to Ground Potential

A9 & OE

VALUE

-40oC to 85oC

-65oC to 125oC

-0.5V to 7.0V

-0.5V to 7.0V

-0.5V to 7.0V

-0.5V to 13.5V

NOTICE:

Stresses greater than those listed under ABSOLUTE MAXI-

MUM RATINGS may cause permanent damage to the de-

vice. This is a stress rating only and functional operational

sections of this specification is not implied. Exposure to ab-

solute maximum rating conditions for extended period may

affect reliability.

NOTICE:

Specifications contained within the following tables are sub-

ject to change.

P/N:PM0578

REV. 1.7, JUL. 24, 2001

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