JS48F4400P0P3C0 datasheet(93/139 Pages) NUMONYX

93 / 139 page

April 2008

Datasheet

309823-10

Numonyx™ StrataFlash® Cellular Memory (M18)

Note:

Issuing the Read Array command to a partition that is actively erasing a main block

causes subsequent reads from that partition to output invalid data. Valid array data is

output only after the block-erase operation has finished.

Standby power levels are not realized until the block-erase operation has finished.

Asserting RST# immediately aborts the block-erase operation, and array contents at

the addressed location are indeterminate. The addressed block should be erased, and

the data re-programmed.

9.8

Blank Check Operation

Blank Check is used to see if a main-array block is completely erased. A Blank Check

operation is performed one block at a time, and cannot be used during Program

Suspend or Erase Suspend.

To use Blank Check, first issue the Blank Check setup command followed by the confirm

command. The read mode of the addressed partition is automatically changed to Read

Status Register mode, which remains in effect until another read-mode command is

issued.

During a blank check operation, the Status Register indicates a busy status (SR7 = 0).

Upon completion, the Status Register indicates a ready status (SR7 = 1).

Note:

Issuing the Read Status Register command to another partition switches that partition’s

read mode to Read Status Register mode, thereby allowing the blank check operation

to be monitored from that partition’s address.

The Status Register should be checked for any errors, and then cleared. If the Blank

Check operation fails, i.e., the block is not completely erased, then the Status Register

will indicate a Blank Check error (SR[7,5] = 1).

The only valid command during a Blank Check operation is Read Status. Blank Check

cannot be suspended. After the blank check operation has completed, any valid

command can be issued.

9.9

Suspend and Resume

Program and erase operations of the main array can be suspended to perform other

device operations, and then subsequently resumed. However, OTP Register

programming or blank check operations cannot be suspended.

To suspend an on-going erase or program operation, issue the Suspend command to

any device address; the corresponding partition is not affected. Table 43 shows the

Suspend and Resume command bus-cycles.

Note:

Issuing the Suspend command does not change the read mode of the partition. The

partition will be in Read Status Register mode from when the erase or program

command was first issued, unless the read mode was changed prior to issuing the

Suspend command.

Table 42: Blank Check Command Bus Cycles

Command

Setup Write Cycle

Confirm Write Cycle

Address Bus

Data Bus

Address Bus

Data Bus

Blank Check

Block Address

00BCh

Block Address

00D0h

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