MX29LV320E Просмотр технического описания (PDF) - Macronix International

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MX29LV320E

32M-BIT [4M x 8 / 2M x 16] 3V SUPPLY FLASH MEMORY

Macronix International 

MX29LV320E T/B

FUNCTIONAL OPERATION DESCRIPTION (cont'd)

READ INDICATOR BIT (Q7) FOR SECURITY SECTOR

To determine if the Security Sector has been locked at the factory, the system performs a READ OPERATION

with A9 raised to Vhv, address pin A6 held LOW, and address pins A1 & A0 held HIGH. If the Security Sector

has been locked at the factory, the code 99h will be present on data bits Q7 to Q0. Otherwise, the factory

unlocked code of 19h will be present.

INHERENT DATA PROTECTION

To avoid accidental erasure or programming of the device, the device is automatically reset to Read mode during

power up. Additionally, the following design features protect the device from unintended data corruption.

COMMAND COMPLETION

Only after the successful completion of the specified command sets will the device begin its erase or program

operation. If any command sequence is interrupted or given an invalid command, the device immediately returns

to Read mode.

LOW VCC WRITE INHIBIT

The device refuses to accept any write command when Vcc is less than Vlko. This prevents data from spuriously

being altered during power-up, power-down, or temporary power interruptions. The device automatically resets

itself when Vcc is lower than Vlko and write cycles are ignored until Vcc is greater than Vlko. The system must

provide proper signals on control pins after Vcc rises above Vlko to avoid unintentional program or erase opera-

tions.

WRITE PULSE "GLITCH" PROTECTION

CE#, WE#, OE# pulses shorter than 5ns are treated as glitches and will not be regarded as an effective write

cycle.

LOGICAL INHIBIT

A valid write cycle requires both CE# and WE# at Vil with OE# at Vih. Write cycle is ignored when either CE# at

Vih, WE# a Vih, or OE# at Vil.

POWER-UP SEQUENCE

Upon power up, the MX29LV320E T/B is placed in Read mode. Furthermore, program or erase operation will be-

gin only after successful completion of specified command sequences.

P/N:PM1575

REV. 1.3, DEC. 19, 2013

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