JS48F4400P0P3C0 datasheet(105/139 Pages) NUMONYX

105 / 139 page

April 2008

Datasheet

309823-10

105

Numonyx™ StrataFlash® Cellular Memory (M18)

Figure 56: Block Erase for Main Array Flowchart

Start

FULL ERASE STATUS CHECK PROCEDURE

Repeat for subsequent block erasures.

Full Status register check can be done after each block erase

or after a sequence of block erasures.

Write 0xFF after the last operation to enter read array mode.

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

allow further erase attempts.

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

If an error is detected, clear the Status register before

attempting an erase retry or other error recovery.

Suspend

Erase

Yes

Suspend

Erase

Loop

Write 0x20

Block Address

Write 0xD0,

Block Address

Read Status

(2)

SR[7] =

Full Erase

Status Check

(if desired)

Block Erase

Complete

Read Status

Erase Fail

SR[1] =

Block Locked

Error

BLOCK ERASE PROCEDURE

Bus

Operation

Command

Comments

Write

Block

Erase

Setup

Data = 0x20

Addr = Block to be erased (BA)

Write

Erase

Confirm

Data = 0xD0

Addr = Block to be erased (BA)

Read

None

Status Register data

Idle

None

Check SR[7]:

1 = WSM ready

0 = WSM busy

Bus

Operation

Command

Comments

Idle

None

Check SR[3]:

1 = VPP Range Error

Idle

None

Check SR[4,5]:

Both 1 = Command Sequence Error

Idle

None

Check SR[5]:

1 = Block Erase Error

Idle

None

Check SR[1]:

1 = Attempted erase of locked block;

erase aborted.

(Block Erase)

(Erase Confirm )

1,1

SR[4,5] =

Command

Sequence Error

SR[3] =

VPP Range

Error

SR[5] =

Block Erase

Success

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