L320DB12VC datasheet(30/57 Pages) AMD

30 / 57 page

Am29LV320D

December 14, 2005

DA TA SH EET

DQ2, or RY/BY# in the erasing sector. Refer to “Write

Operation Status” on page 30 for information on these

status bits.

Once the sector erase operation begins, 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 returns to read-

ing array data, to ensure data integrity.

Figure 5, on page 28 illustrates the algorithm for the

erase operation. Refer to table “Erase and Program

Operations” on page 41 for parameters, and Figure

19, on page 43 for timing diagrams.

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 µs to suspend the erase operation. How-

ever, when the Erase Suspend command is written

during the sector erase time-out, the device immedi-

ately terminates the time-out period and suspends the

erase operation.

After the erase operation is suspended, the device en-

ters the erase-suspend-read mode. The system can

read data from or program data to any sector not se-

lected for erasure. (The device “erase suspends” all

sectors selected for erasure.) Reading at any address

within erase-suspended sectors produces status infor-

mation on DQ7–DQ0. The system can use DQ7, or

DQ6 and DQ2 together, to determine if a sector is ac-

tively erasing or is erase-suspended. Refer to the

“Write Operation Status” on page 30 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 Byte Program operation.

Refer to “Write Operation Status” on page 30 for more

information.

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

issue the autoselect command sequence. Refer to

“Autoselect Mode” on page 16 and “Autoselect Com-

mand Sequence” on page 25 for details.

To resume the sector erase operation, the system

must write the Erase Resume command. Fur ther

writes of the Resume command are ignored. Another

Erase Suspend command can be written after the chip

resumes erasing.

Figure 5.

Erase Operation

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 Table 14 on page 29 for erase command sequence.

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

erase timer.

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