L800BT90VC datasheet(22/49 Pages) AMD

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Am29LV800B

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 deter-

mine the status of the program operation using the

DQ7 or DQ6 status bits, just as in the standard

program operation. See “Write Operation Status” 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

va li d o p e ratio n . 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 opera-

tion. Further writes of the Resume command are

ignored. Another Erase Suspend command can be

written after the device has resumed erasing.

Notes:

1. See Table 1 for erase command sequence.

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

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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