AM29LV6402ML100R datasheet(32/57 Pages) SPANSION

32 / 57 page

Am29LV6402M

January 23, 2006

After the erase operation has been suspended, the

device 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 sus-

pends” all sectors selected for erasure.) Reading at

any address within erase-suspended sectors pro-

duces status information on DQ15–DQ0. The system

can use DQ7 and DQ15, or DQ6 and DQ14 and DQ2

and DQ10 together, to determine if a sector is actively

erasing or is erase-suspended. Refer to the Write Op-

eration Status section for information 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 and DQ15 or DQ6

and DQ14 status bits, just as in the standard word pro-

gram 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. Fur ther

writes of the Resume command are ignored. Another

Erase Suspend command can be written after the chip

has resumed erasing.

Figure 7.

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 Tables 10 and 11 for program command sequence.

2. See the section on DQ3 and DQ10 for information on

the sector erase timer.

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