MBM29PL65LM90TN datasheet(17/56 Pages) SPANSION

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MBM29PL65LM-90/10

protected again. Refer to “Temporary Sector Group Unprotection Timing Diagram” in s SWITCHING WAVE-

FORMS and “Temporary Sector Group Unprotection Algorithm” in s FLOW CHART.

Hardware Reset

The device may be reset by driving the RESET pin to VIL. The RESET pin has a pulse requirement and has to

be kept low (VIL) for at least “tRP” in order to properly reset the internal state machine. Any operation in the process

of being executed is terminated and the internal state machine is reset to the read mode “tREADY” after the RESET

pin is driven low.

Furthermore once the RESET pin goes high the device requires an additional “tRH” before it allows read access.

When the RESET pin is low, the device is in the standby mode for the duration of the pulse and all the data

output pins are tri-stated. If a hardware reset occurs during a program or erase operation, the data at that

particular location are corrupted.

Write Protect (WP)

Aside from Sector Group Protection, MBM29PL65LM provides another function that protects the first sector

(SA0) during programming and erase. When WP = VIL, this first sector (SA0) becomes protected while Sector

Group Protection for all the other sectors are temporarily lifted.

Accelerated Program Operation

The device offers accelerated program operation which enables the programming in high speed. If the system

asserts VACC to the ACC pin, the device automatically enters the acceleration mode and the time required for

program operation will reduce to about 85%. This function is primarily intended to allow high speed program,

so caution is needed as the sector group becomes temporarily unprotected.

The system uses fast program command sequence when programming during acceleration mode. Set command

to fast mode and reset command from fast mode are not necessary. When the device enters the acceleration

mode, the device automatically set to fast mode. Therefore the present sequence is used for programming and

detection of completion during acceleration mode.

Removing VACC from the ACC pin and applying VIL or VIH returns the device to normal operation. Do not remove

VACC from ACC pin while programming. See “Accelerated Program Timing Diagram”.

VCCQ

The output voltage generated on the device is determined based on the VCCQ level. This feature allows the device

to operate in mixed-voltage environments, driving and receiving signals to and from other devices on the same

bus.

MBM29PL65LM90TN Datasheet(PDF) 17 Page - SPANSION