AM29F010B datasheet(12/31 Pages) AMD

12 / 31 page

Am29F010

written. If the time between additional sector erase

commands can be assumed to be less than 50

µs, the

system need not monitor DQ3. Any command during

the time-out period resets the device to reading

array data. The system must rewrite the command se-

quence and any additional sector addresses and com-

mands.

The system can monitor DQ3 to determine if the sector

erase timer has timed out. (See the “DQ3: Sector

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

ing edge of the final WE# pulse in the command se-

quence.

Once the sector erase operation has begun, all other

commands are ignored.

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 sta-

tus of the erase operation by using DQ7 or DQ6. Refer

to “Write Operation Status” for information on these

status bits.

Figure 2 illustrates the algorithm for the erase opera-

tion. Refer to the Erase/Program Operations tables in

the “AC Characteristics” section for parameters, and to

the Sector Erase Operations Timing diagram for timing

waveforms.

Notes:

1. See the appropriate Command Definitions table for erase

command sequence.

2. See “DQ3: Sector Erase Timer” for more information.

Figure 2.

Erase Operation

START

Write Erase

Command Sequence

Data Poll

from System

Data = FFh?

Yes

Erasure Completed

Embedded

Erase

algorithm

in progress

16736G-8

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