JS48F4400P0P3C0 datasheet(109/139 Pages) NUMONYX

109 / 139 page

April 2008

Datasheet

309823-10

109

Numonyx™ StrataFlash® Cellular Memory (M18)

Figure 60: Blank Check Operation Flowchart

Start

FULL BLANK CHECK STATUS CHECK PROCEDURE

Write 0xBC,

Block Address

Write 0xD0,

Block Address

Read Status

SR[7] =

Full Blank

Check Status

Read

Blank Check

BLANK CHECK PROCEDURE

Bus

Operation

Command

Comments

Write

Blank

Check

Setup

Data = 0xBC

Addr = Block to be read (BA)

Write

Blank

Check

Confirm

Data = 0xD0

Addr = Block to be read (BA)

Read

None

Status Register data.

Idle

None

Check SR[7]:

1 = WSM ready

0 = WSM busy

SR[1,3] must be cleared before the Write State Machine will

allow Blank Check to be performed.

Only the Clear Status Register command clears SR[1, 3, 4, 5].

If an error is detected, clear the Status register before

attempting a Blank Check retry or other error recovery.

1,1

Read Status

Blank Check

Successful

Bus

Operation

Command

Comments

SR[4,5] =

Command

Sequence Error

SR[5] =

Blank Check

Error

Idle

None

Check SR[4,5]:

Both 1 = Command Sequence Error

Idle

None

Check SR[5]:

1 = Blank Check Error

Repeat for subsequent block Blank Check.

Full Status register check should be read after Blank Check

has been performed on each block.

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