AM29LV640MH datasheet(32/62 Pages) AMD

32 / 62 page

Am29LV640MH/L

December 14, 2005

DA TA SH EET

Figure 6.

Program Suspend/Program Resume

Chip Erase Command Sequence

Chip erase is a six bus cycle operation. The chip erase

command sequence is initiated by writing two unlock

cycles, followed by a set-up command. Two additional

unlock write cycles are then followed by the chip erase

command, which in turn invokes the Embedded Erase

algorithm. The device does not require the system to

preprogram prior to erase. The Embedded Erase algo-

rithm automatically preprograms and verifies the entire

memory for an all zero data pattern prior to electrical

erase. The system is not required to provide any con-

trols or timings during these operations. Tables 10 and

11 show the address and data requirements for the

chip erase command sequence.

When the Embedded Erase algorithm is complete, the

device returns to the read mode and addresses are no

longer latched. The system can determine the status

of the erase operation by using DQ7, DQ6, or DQ2.

Refer to the Write Operation Status section for infor-

mation on these status bits.

Any commands written during the chip erase operation

are ignored. However, note that a hardware reset im-

mediately terminates the erase operation. If that oc-

curs, the chip erase command sequence should be

reinitiated once the device has returned to reading

array data, to ensure data integrity. Note that the

SecSi Sector, autoselect, and CFI functions are un-

available when an erase operation is in progress.

Figure 7 illustrates the algorithm for the erase opera-

tion. Refer to the Erase and Program Operations ta-

bles in the AC Characteristics section for parameters,

and Figure 19 section for timing diagrams.

Sector Erase Command Sequence

Sector erase is a six bus cycle operation. The sector

erase command sequence is initiated by writing two

unlock cycles, followed by a set-up command. Two ad-

ditional unlock cycles are written, and are then fol-

lowed by the address of the sector to be erased, and

the sector erase command. Tables 10 and 11 show the

address and data requirements for the sector erase

command sequence.

The device does not require the system to preprogram

prior to erase. The Embedded Erase algorithm auto-

matically programs and verifies the entire memory for

Program Operation

or Write-to-Buffer

Sequence in Progress

Write Program Suspend

Command Sequence

Command is also valid for

Erase-suspended-program

operations

Autoselect and SecSi Sector

read operations are also allowed

Data cannot be read from erase- or

program-suspended sectors

Write Program Resume

Command Sequence

Read data as

required

Done

reading?

Yes

Write address/data

XXXh/30h

Device reverts to

operation prior to

Program Suspend

Write address/data

XXXh/B0h

Wait 15

μs

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