AT49LW080 datasheet(19/34 Pages) ATMEL

19 / 34 page

AT49LW080/040

1966C–FLASH–03/02

ERASE SUSPEND: The Erase Suspend command allows sector-erase interruption to

read or program data in another sector of memory. Once the sector erase process

starts, writing the sector erase suspend command requests that the WSM suspend the

sector erase sequence at a predetermined point in the algorithm. The device outputs

status register data when read after the sector erase suspend command is written. Poll-

ing the status register can help determine when the sector erase operation was

suspended. After a successful suspend, a Read Array command can be written to read

data from a sector other than the suspended sector. A program command sequence

may also be issued during erase suspend to program data in sectors other than the sec-

tor currently in the erase suspend mode.

The other valid commands while sector erase is suspended include Read Status Regis-

ter and Sector Erase Resume. After a Sector Erase Resume command is written, the

WSM will continue the sector erase process. VPP must remain at VPPH1/2 (the same VPP

level initially used for sector erase) while sector erase is suspended. RST or INIT must

also remain at VIH. Sector erase cannot resume until program operations initiated during

sector erase suspend have completed.

PROGRAM SUSPEND: The Program Suspend command allows program interruption

to read data in other memory locations. Once the program process starts, writing the

Program Suspend Command requests that the WSM suspend the program sequence at

a predetermined point in the algorithm. The device continues to output status register

data when read after the program suspend command is written. Polling the status regis-

ter can help determine when the program operation was suspended. After a successful

suspend, a Read Array command can be written to read data from locations other than

that which is suspended. The only other valid commands while program is suspended

are Read Status Register and Program Resume. VPP must remain at VPPH1/2 (the same

VPP level used for program) while in program suspend mode. RST or INIT must also

remain at VIH.

READ STATUS REGISTER: The status register may be read to determine when a sec-

tor erase or program completes and whether the operation completed successfully. The

status register may be read at any time by writing the Read Status Register command.

After writing this command, all subsequent read operations will return data from the sta-

tus register until another valid command is written. The Read Status Register command

functions independently of the VPP voltage.

CLEAR STATUS REGISTER: Error flags in the status register can only be set to “1”sby

the WSM and can only be reset by the Clear Status Register command. These bits indi-

cate various failure conditions. The Clear Status Register command functions

independently of the applied VPP voltage.

AT49LW080 Datasheet(PDF) 19 Page - ATMEL Corporation