AM29BL162C datasheet(23/50 Pages) SPANSION

23 / 50 page

July 8, 2005

Am29BL162C

DA T A

SH EET

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, DQ6, DQ2, or

RY/BY#. (Refer to “Write Operation Status” for informa-

tion on these status bits.)

Figure 6 illustrates the algorithm for the erase opera-

tion. Refer to the Erase/Program Operations tables in

the “AC Characteristics” section for parameters, and to

Figure 19 for timing diagrams.

Notes:

1. See Table 8 for erase command sequence.

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

Figure 6.

Erase Operation

Erase Suspend/Erase Resume Commands

The Erase Suspend command allows the system to in-

terrupt a sector erase operation and then read data

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

erasure. The Erase Suspend command has a different

effect depending on whether the Flash device is in

Asynchronous Mode or Burst Mode.

Asynchronous Mode

The Erase Suspend command is only valid when the

Flash device is in Asynchronous Mode. During Erase

Suspend operation Asynchronous read/program oper-

ations behave normally in non-erasing sectors. How-

ever, Erase Suspend operation prevents the Flash

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

START

Write Erase

Command Sequence

Data Poll

from System

Data = FFh?

Yes

Erasure Completed

Embedded

Erase

algorithm

in progress

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