AM29LV640MH datasheet(31/62 Pages) AMD

31 / 62 page

December 14, 2005

Am29LV640MH/L

DA TA SH EET

Note: See Table 11 for program command sequence.

Figure 5.

Program Operation

Program Suspend/Program Resume

Command Sequence

The Program Suspend command allows the system to

interrupt a programming operation or a Write to Buffer

programming operation so that data can be read from

any non-suspended sector. When the Program Sus-

pend command is written during a programming pro-

cess, the device halts the program operation within 15

μs maximum (5 μs typical) and updates the status bits.

Addresses are not required when writing the Program

Suspend command.

After the programming operation has been sus-

pended, the system can read array data from any

non-suspended sector. The Program Suspend com-

mand may also be issued during a programming oper-

ation while an erase is suspended. In this case, data

may be read from any addresses not in Erase Sus-

pend or Program Suspend. If a read is needed from

the SecSi Sector area (One-time Program area), then

user must use the proper command sequences to

enter and exit this region. Note that the SecSi Sector,

autoselect, and CFI functions are unavailable when an

program operation is in progress.

The system may also write the autoselect command

sequence when the device is in the Program Suspend

mode. The system can read as many autoselect

codes as required. When the device exits the autose-

lect mode, the device reverts to the Program Suspend

mode, and is ready for another valid operation. See

Autoselect Command Sequence for more information.

After the Program Resume command is written, the

device reverts to programming. The system can de-

termine the status of the program operation using the

DQ7 or DQ6 status bits, just as in the standard pro-

gram operation. See Write Operation Status for more

information.

The system must write the Program Resume com-

mand (address bits are don’t care) to exit the Program

Suspend mode and continue the programming opera-

tion. Further writes of the Resume command are ig-

nored. Another Program Suspend command can be

written after the device has resume programming.

START

Write Program

Command Sequence

Data Poll

from System

Verify Data?

Yes

Last Address?

Yes

Programming

Completed

Increment Address

Embedded

Program

algorithm

in progress

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