AM29F160DB75 datasheet(23/47 Pages) SPANSION

23 / 47 page

April 23, 2010 Am29F160D_00_D10

Am29F160D

D A TA SH EE T

The Sector Erase command sequence should be rein-

itiated once the device returns to reading array data, to

ensure data integrity.

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‚ on page 23

for information on these status bits.

Figure 4, on page 21 illustrates the algorithm for the

erase operation. Refer to the Erase/Program Opera-

tions tables in the AC Characteristics‚ on page 31 for

parameters, and to the Sector Erase Operations Tim-

ing diagram for timing waveforms.

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. This command is valid only during the sector

erase operation, 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 operation or Embedded Program algo-

rithm. Writing the Erase Suspend command during the

Sector Erase time-out immediately terminates the

time-out period and suspends the erase operation. Ad-

dresses are “don’t-cares” when writing the Erase Sus-

pend command.

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 sector erase time-out, the device immediately ter-

minates the time-out period and suspends the erase

operation.

After the erase operation is 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. Reading at any

address within erase-suspended sectors produces sta-

tus data 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. See Write Oper-

ation Status‚ on page 23 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 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‚ on page 23 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‚

on page 19 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 resumes erasing.

1. See the appropriate Command Definitions table for erase

command sequence.

2. See DQ3: Sector Erase Timer‚ on page 25 for more infor-

mation.

Figure 4.

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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