JS28F320J3F75A datasheet(39/66 Pages) NUMONYX

39 / 66 page

Jan 2011

Datasheet

208032-03

Numonyx® Embedded Flash Memory (J3 65 nm) Single Bit per Cell (SBC)

Note:

Issuing the Read Array command to the device while it is actively erasing causes

subsequent reads from the device to output invalid data. Valid array data is output only

after the block-erase operation has finished.

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

Also, asserting RP# aborts the block-erase operation, and array contents at the

addressed location are indeterminate. The addressed block should be erased before

programming within the block is attempted.

9.5

Blank Check

The Blank Check operation determines whether a specified array block is blank (i.e.

completely erased). Without Blank Check, Block Erase would be the only other way to

ensure a block is completely erased. Blank Check is especially useful in the case of

erase operation interrupted by a power loss event.

Blank Check can apply to only one block at a time, and no operations other than Status

erase etc.). Suspend and resume operations are not supported during Blank Check, nor

is Blank Check supported during any suspended operations.

Blank Check operations are initiated by writing the Block Blank Check command to the

block address. Next, the Blank Check Confirm command is issued along with the same

block address. When a successful command sequence is entered, the device

automatically enters the Read Status State. The WSM then reads the entire specified

block, and determines whether any bit in the block is programmed or over-erased.

The status register can be examined for Blank Check progress and errors by reading

any address within the block being accessed. During a blank check operation, the

Status Register indicates a busy status (SR.7 = 0). Upon completion, the Status

any errors, and then cleared. If the Blank Check operation fails, which means the block

is not completely erased, the Status Register bit SR.5 will be set (“1”). CE# or OE#

toggle (during polling) updates the Status Register.

The device remains in Status Register Mode until another command is written to the

device. After examining the Status Register, it should be cleared by the Clear Status

Blank Check command is complete.

9.6

Suspend and Resume

An erase or programming operation can be suspended to perform other operations, and

then subsequently resumed. Table 24 shows the Suspend and Resume command bus-

cycles.

Note:

All erase and programming operations require the addressed block to remain unlocked

with a valid voltage applied to VPEN throughout the suspend operation. Otherwise, the

block-erase or programming operation will abort, setting the appropriate Status

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