AM29PDLI27H datasheet(38/68 Pages) SPANSION

38 / 68 page

Am29PDL127H

June 30, 2003

ADV ANCE

I N FO RMAT I O N

Figure 4.

Program Operation

Chip Erase Command Sequence

Chip erase is a six bus cycle operation. The chip erase

command sequence is initiated by writing two unlock

cycles, followed by a set-up command. Two additional

unlock write cycles are then followed by the chip erase

command, which in turn invokes the Embedded Erase

algorithm. The device does not require the system to

preprogram prior to erase. The Embedded Erase algo-

rithm automatically preprograms and verifies the entire

memory for an all zero data pattern prior to electrical

erase. The system is not required to provide any con-

trols or timings during these operations. Table 13

shows the address and data requirements for the chip

erase command sequence.

When the Embedded Erase algorithm is complete,

that bank returns to the read mode and addresses are

no longer latched. The system can determine the sta-

tus of the erase operation by using DQ7, DQ6, DQ2,

or RY/BY#. Refer to the Write Operation Status sec-

tion for information on these status bits.

Any commands written during the chip erase operation

are ignored. Note that SecSi Sector, autoselect, and

CFI functions are unavailable when a [program/erase]

operation is in progress. However, note that a hard-

ware reset immediately terminates the erase opera-

tion. If that occurs, the chip erase command sequence

should be reinitiated once that bank has returned to

reading array data, to ensure data integrity.

Figure 5 illustrates the algorithm for the erase opera-

tion. Refer to the Erase and Program Operations ta-

bles in the AC Characteristics section for parameters,

and Figure 17 section for timing diagrams.

Sector Erase Command Sequence

Sector erase is a six bus cycle operation. The sector

erase command sequence is initiated by writing two

unlock cycles, followed by a set-up command. Two ad-

ditional unlock cycles are written, and are then fol-

lowed by the address of the sector to be erased, and

the sector erase command.Table 13 shows the ad-

dress and data requirements for the sector erase com-

mand sequence.

The device does not require the system to preprogram

prior to erase. The Embedded Erase algorithm auto-

matically programs and verifies the entire memory for

an all zero data pattern prior to electrical erase. The

system is not required to provide any controls or tim-

ings during these operations.

After the command sequence is written, a sector erase

time-out of 50 µs occurs. During the time-out period,

additional sector addresses and sector erase com-

mands may be written. Loading the sector erase buffer

may be done in any sequence, and the number of sec-

tors may be from one sector to all sectors. The time

between these additional cycles must be less than 50

µs, otherwise erasure may begin. Any sector erase

a ddre ss a nd command fo llo wing the exce ede d

time-out may or may not be accepted. It is recom-

mended that processor interrupts be disabled during

this time to ensure all commands are accepted. The

interrupts can be re-enabled after the last Sector

Erase command is written. Any command other than

S e c t or E r as e or E r ase S u spe n d du ring th e

time-out period resets that bank to the read mode.

The system must rewrite the command sequence and

any additional addresses and commands. Note that

SecSi Sector, autoselect, and CFI functions are un-

available when a [program/erase] operation is in

progress.

The system can monitor DQ3 to determine if the sec-

tor erase timer has timed out (See the section on DQ3:

Sector Erase Timer). The time-out begins from the ris-

ing edge of the final WE# pulse in the command

sequence.

When the Embedded Erase algorithm is complete, the

bank returns to reading array data and addresses are

no longer latched. Note that while the Embedded

Erase operation is in progress, the system can read

START

Write Program

Command Sequence

Data Poll

from System

Verify Data?

Yes

Last Address?

Yes

Programming

Completed

Increment Address

Embedded

Program

algorithm

in progress

Note: See Table 13 for program command sequence.

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