M700000002 datasheet(102/128 Pages) SPANSION

102 / 128 page

100

Am70PDL127BDH/Am70PDL129BDH

November 25, 2003

AD VAN C E

INFORM ATION

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

device returns to reading array data and addresses

are no longer latched. The system can determine the

status of the erase operation by reading DQ7, DQ6, or

DQ2 in the erasing sector. Refer to the Write Opera-

tion Status section for information on these status bits.

Once the sector erase operation has begun, only the

Erase Suspend command is valid. All other com-

mands are ignored. However, note that a hardware

reset immediately terminates the erase operation. If

that occurs, the sector erase command sequence

should be reinitiated once the device has returned to

reading array data, to ensure data integrity.

Figure 7 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 19 section for timing diagrams.

Figure 7.

Erase Operation

Erase Suspend/Erase Resume

Commands

The Erase Suspend command, B0h, allows the sys-

tem to interrupt a sector erase operation and then read

data from, or program data to, any sector not selected

for erasure. This command is valid only during the sec-

tor erase operation, including the 50 µs time-out pe-

riod during the sector erase command sequence. The

Erase Suspend command is ignored if written during

the chip erase operation or Embedded Program

algorithm.

When the Erase Suspend command is written during

the sector erase operation, the device requires a max-

imum of 20 (typical 5 µs) to suspend the erase opera-

tion. However, when the Erase Suspend command is

written during the sector erase time-out, the device im-

mediately terminates the time-out period and sus-

pends the erase operation.

After the erase operation has been suspended, the

device enters the erase-suspend-read mode. The sys-

tem can read data from or program data to any sector

not selected for erasure. (The device “erase sus-

pends” all sectors selected for erasure.) Reading at

any address within erase-suspended sectors pro-

duces status information on DQ7–DQ0. The system

can use DQ7, or DQ6 and DQ2 together, to determine

if a sector is actively erasing or is erase-suspended.

Refer to the Write Operation Status section for infor-

mation on these status bits.

After an erase-suspended program operation is com-

plete, the device returns to the erase-suspend-read

mode. The system can determine the status of the

program operation using the DQ7 or DQ6 status bits,

just as in the standard word program operation.

Refer to the Write Operation Status section for more

information.

In the erase-suspend-read mode, the system can also

issue the autoselect command sequence. Refer to the

Autoselect Mode and Autoselect Command Sequence

sections for details.

To resume the sector erase operation, the system

must write the Erase Resume command. The address

of the erase-suspended sector is required when writ-

ing this command. Further writes of the Resume com-

mand are ignored. Another Erase Suspend command

can be written after the chip has resumed erasing.

START

Write Erase

Command Sequence

(Notes 1, 2)

Data Poll to Erasing

Bank from System

Data = FFh?

Yes

Erasure Completed

Embedded

Erase

algorithm

in progress

Notes:

1. See Tables 10 and 11 for erase command sequence.

2. See the section on DQ3 for information on the sector

erase timer.

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