AMC010CFLKA datasheet(15/42 Pages) AMD

15 / 42 page

5/4/98

AmC0XXCFLKA

Sector Erase Suspend

Sector Erase Suspend command allows the user to in-

terrupt the chip and then do data reads (not program)

from a non-busy sector while it is in the middle of a

Sector Erase operation (which may take up to several

seconds). This command is applicable ONLY during

the Sector Erase operation and will be ignored if written

during the chip Erase or Programming operation. The

Erase Suspend command (B0H) will be allowed only

during the Sector Erase Operation that will include the

sector erase time-out period after the Sector Erase

commands (30H). Writing this command during the

time-out will result in immediate termination of the

time-out period. Any subsequent writes of the Sector

Erase command will be ignored as such, but instead

will be taken as the Erase Resume command. Note

that any other commands during the time out will reset

the d ev i ce t o re ad m ode. The addr es s e s ar e

don’t-cares in writing the Erase Suspend or Erase

Resume commands.

When the Sector Erase Suspend command is written

during a Sector Erase operation, the chip will take be-

tween 0.1

µs to 10 µs to suspend the erase operation

and go into erase suspended read mode (pseudo-read

mode), during which the user can read from a sector

that is NOT being erased. A read from a sector being

erased may result in invalid data. The user must moni-

tor the toggle bit (D6) to determine if the chip has en-

tered the pseudo-read mode, at which time the toggle

bit stops toggling. Note that the user must keep track of

what state the chip is in since there is no external indi-

cation of whether the chip is in pseudo-read mode or

actual read mode. After the user writes the Sector

Erase Suspend command and waits until the toggle bit

stops toggling, data reads from the device may then be

performed. Any further writes of the Sector Erase Sus-

pend command at this time will be ignored.

Every time a Sector Erase Suspend command followed

by an Erase Resume command is written, the internal

(pulse) counters are reset. These counters are used to

count the number of high voltage pulses the memory

cell requires to program or erase. If the count exceeds

a certain limit, then the D5 bit will be set (Exceeded

Time Limit flag). This resetting of the counters is nec-

essary since the Erase Suspend command can poten-

tially interrupt or disrupt the high voltage pulses.

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 ignore. An-

other Sector Erase Suspend command can be written

after the chip has resumed.

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