AM29F016 datasheet(14/36 Pages) AMD

14 / 36 page

Am29F016

Program Algorithm. Writing the Erase Suspend com-

mand during the Sector Erase time-out results in imme-

diate termination of the time-out period and suspension

of the erase operation.

Any other command written during the Erase Suspend

mode will be ignored except the Erase Resume com-

mand. Writing the Erase Resume command resumes

the erase operation. The addresses are “don’t-cares”

when writing the Erase Suspend or Erase Resume

command.

When the Erase Suspend command is written during

the Sector Erase operation, the device will take a max-

imum of 15

µs to suspend the erase operation. When

the device has entered the erase-suspended mode, the

RY/BY output pin and the DQ7 bit will be at logic ‘1’,

and DQ6 will stop toggling. The user must use the ad-

dress of the erasing sector for reading DQ6 and DQ7 to

determine if the erase operation has been suspended.

Further writes of the Erase Suspend command are ig-

nored.

When the erase operation has been suspended, the

device defaults to the erase-suspend-read mode.

Reading data in this mode is the same as reading from

the standard read mode except that the data must be

read from sectors that have not been erase-sus-

pended. Successively reading from the erase-sus-

pe nde d sect or w h ile the de vice is in the

erase-suspend-read mode will cause DQ2 to toggle.

(See the section on DQ2).

After entering the erase-suspend-read mode, the user

can program the device by writing the appropriate com-

mand sequence for Byte Program. This program mode

is known as the erase-suspend-program mode. Again,

programming in this mode is the same as programming

in the regular Byte Program mode except that the data

must be programmed to sectors that are not erase-sus-

pended. Successively reading from the erase-sus-

pe nde d sect or w h ile the de vice is in the

erase-suspend-program mode will cause DQ2 to tog-

gle. The end of the erase-suspended program opera-

tion is detected by the RY/BY output pin, Data Polling

of DQ7, or by the Toggle Bit I (DQ6) which is the same

as the regular Byte Program operation. Note that DQ7

must be read from the byte program address while

DQ6 can be read from any address.

To resume the operation of Sector Erase, the Resume

command (30H) should be written. Any further writes of

the Resume command at this point will be ignored. An-

other Erase Suspend command can be written after the

chip has resumed erasing.

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