JS48F4400PCZ00 datasheet(69/102 Pages) NUMONYX

69 / 102 page

November 2007

Datasheet

Order Number: 290701-18

Numonyx™ Wireless Flash Memory (W18)

12.3

Read-While-Write and Read-While-Erase

The Numonyx™ Wireless Flash Memory (W18) supports flexible multi-partition dual-

operation architecture. By dividing the flash memory into many separate partitions, the

device can read from one partition while programing or erasing in another partition;

hence the terms, RWW and RWE. Both of these features greatly enhance data storage

performance.

Figure 30: Block Erase Flowchart

SR[3,1] must be cleared before the WSM will allow further

erase attempts.

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

If an error is detected, clear the Status register before

attempting an erase retry or other error recovery.

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.

Suspend

Erase

Yes

Suspend

Erase

Loop

Write 20h

Block Address

Write D0h and

Block Address

Read Status

SR[7] =

Full Erase

Status Check

(if desired)

Block Erase

Complete

Read Status

Block Erase

Successful

SR[1] =

Erase of

Locked Block

Aborted

BLOCK ERASE PROCEDURE

Bus

Operation

Command

Comments

Write

Block

Erase

Setup

Data = 20h

Addr = Block to be erased (BA)

Write

Erase

Confirm

Data = D0h

Addr = Block to be erased (BA)

Read

Read SRD

Toggle CE# or OE# to update SRD

Standby

Check SR[7]

1 = WSM ready

0 = WSM busy

Bus

Operation

Command

Comments

SR[3] =

PP Range

Error

SR[5:4] =

Command

Sequence Error

SR[5] =

Block Erase

Error

Standby

Check SR[3]

1 = V

PP error

Standby

Check SR[5:4]

Both 1 = Command sequence error

Standby

Check SR[5]

1 = Block erase error

Standby

Check SR[1]

1 = Attempted erase of locked block

Erase aborted

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