AM29DL800B datasheet(21/46 Pages) AMD

21 / 46 page

December 4, 2006 21519C4

Am29DL800B

D A TA

SH EE T

mediately terminates the erase operation. If that

occurs, the sector erase command sequence should

be reinitiated once that bank has returned to reading

array data, to ensure data integrity.

Figure 4 illustrates the algorithm for the erase opera-

tion. Refer to the Erase and Program Operations tables

in the AC Characteristics section for parameters, and

Figure 18 section for timing diagrams.

Erase Suspend/Erase Resume Commands

The Erase Suspend command, B0h, allows the system

to interrupt a sector erase operation and then read data

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

erasure. The bank address is required when writing

this command. This command is valid only during the

sector 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.

However, 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 has been suspended, the

bank enters the erase-suspend-read mode. The sys-

tem can read data from or program data to any sector

not selected for erasure. (The device “erase suspends”

all sectors selected for erasure.) Reading at any ad-

dress within erase-suspended sectors produces status

information 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. Refer to the

Write Operation Status section for information on these

status bits.

After an erase-suspended program operation is com-

plete, the bank returns to the erase-suspend-read

mode. The system can determine the status of the pro-

gram operation using the DQ7 or DQ6 status bits, just

as in the standard Byte Program operation. Refer to the

Write Operation Status section for more information.

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

issue the autoselect command sequence. Refer to the

Autoselect Mode and Autoselect Command Sequence

sections for details.

To resume the sector erase operation, the system must

write the Erase Resume command. The bank address

of the erase-suspended bank is required when writing

this command. Further writes of the Resume command

are ignored. Another Erase Suspend command can be

written after the chip has resumed erasing.

Notes:

1. See Table 5 for erase command sequence.

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

erase timer.

Figure 4.

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

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