AM29PL320DB20WPI datasheet(25/49 Pages) AMD

25 / 49 page

June 13, 2005

Am29PL320D

suspends” all sectors selected for erasure.) Note that

unlock bypass programming is not allowed when the

device is erase-suspended.

Reading at any address within erase-suspended sec-

tors produces status data 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.

See “Write Operation Status” for information on these

status bits.

After an erase-suspended program operation is com-

plete, the system can once again read array data

within non-suspended sectors. The system can deter-

mine the status of the program operation using the

DQ7 or DQ6 status bits, just as in the standard

program operation. See “Write Operation Status” for

more information.

The system may also write the autoselect command

sequence when the device is in the Erase Suspend

mode. The device allows reading autoselect codes

even at addresses within erasing sectors, since the

codes are not stored in the memory array. When the

device exits the autoselect mode, the device reverts to

the Erase Suspend mode, and is ready for another

valid operation. See “Autoselect Command Sequence”

for more information.

The system must write the Erase Resume command

(address bits are “don’t care”) to exit the erase sus-

pend mode and continue the sector erase operation.

Further writes of the Resume command are ignored.

Another Erase Suspend command can be written after

the device has resumed erasing.

Notes:

1. See Table 13 for erase command sequence.

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

Figure 3.

Erase Operation

START

Write Erase

Command Sequence

Data Poll

from System

Data = FFh?

Yes

Erasure Completed

Embedded

Erase

algorithm

in progress

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