AM29BL802CB datasheet(21/46 Pages) AMD

21 / 46 page

November 3, 2006 22371C7

Am29BL802C

D A TA

SH EET

device from entering Burst Mode. To enter Burst Mode

either the Erase operation must be allowed to complete

normally, or it can be prematurely terminated by issuing

a Hardware Reset.

Burst Mode

While in Burst Mode the Erase Suspend command is

ignored and the device continues to operate normally in

Burst Mode. If Erase Suspend operation is required,

then Burst Mode must be terminated and Asynchro-

nous Mode initiated.

General

This command is valid only during the sector erase op-

eration, including the 50 µs time-out period during the

sector erase command sequence. The Erase Suspend

command is ignored if written during the chip erase op-

eration or Embedded Program algorithm. Writing the

Erase Suspend command during the Sector Erase

time-out immediately terminates the time-out period

and suspends the erase operation. Addresses are

“don’t-cares” when writing the Erase Suspend com-

mand.

When the Erase Suspend command is written during a

sector erase operation, the device requires a maximum

of 20 µs to suspend the erase operation. However, when

the Erase Suspend command is written during the sec-

tor erase time-out, the device immediately terminates

the time-out period and suspends the erase operation.

After the erase operation has been suspended, the

system can read array data from or program data to

any sector not selected for erasure. (The device “erase

suspends” all sectors selected for erasure.) Normal

read and write timings and command definitions apply.

Note that burst read is not available when the device is

erase-suspended. Only asynchronous reads are al-

lowed. Reading at any address within erase-sus-

pended sectors 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 informa-

tion 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 determine

the status of the program operation using the DQ7 or

DQ6 status bits, just as in the standard program oper-

ation. See “Write Operation Status” for more informa-

tion.

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 suspend

mode and continue the sector erase operation. Further

writes of the Resume command are ignored. Another

Erase Suspend command can be written after the de-

vice has resumed erasing.

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