PC48F4400PLXB0 datasheet(65/102 Pages) NUMONYX

65 / 102 page

November 2007

Datasheet

Order Number: 290701-18

Numonyx™ Wireless Flash Memory (W18)

12.0

Program and Erase Operations

12.1

Program/Erase Suspend and Resume

The Program Suspend and Erase Suspend commands halt an in-progress program or

erase operation. The command can be issued at any device address. The partition

corresponding to the command’s address remains in its previous state. A suspend

command allows data to be accessed from memory locations other than the one being

programmed or the block being erased.

A program operation can be suspended only to perform a read operation. An erase

operation can be suspended to perform either a program or a read operation within any

block, except the block that is erase suspended. A program command nested within a

suspended erase can subsequently be suspended to read yet another location. Once a

program or erase process starts, the Suspend command requests that the WSM

suspend the program or erase sequence at predetermined points in the algorithm. The

partition that is actually suspended continues to output Status Register data after the

Suspend command is written. An operation is suspended when status bits SR[7] and

SR[6] and/or SR[2] are set.

To read data from blocks within the partition (other than an erase-suspended block),

you can write a Read Array command. Block erase cannot resume until the program

operations initiated during erase suspend are complete. Read Array, Read Status

during Program or Erase Suspend. Additionally, Clear Status Register, Program,

Program Suspend, Erase Resume, Lock Block, Unlock Block, and Lock-Down Block are

valid commands during erase suspend.

To read data from a block in a partition that is not programming or erasing, the

operation does not need to be suspended. If the other partition is already in Read

Array, ID, or Query mode, issuing a valid address returns corresponding data. If the

other partition is not in a read mode, one of the read commands must be issued to the

partition before data can be read.

During a suspend, CE# = VIH places the device in standby state, which reduces active

current. VPP must remain at its program level and WP# must remain unchanged while

in suspend mode.

A resume command instructs the WSM to continue programming or erasing and clears

Status Register bits SR[2] (or SR[6]) and SR[7]. The Resume command can be written

to any partition. When read at the partition that is programming or erasing, the device

outputs data corresponding to the partition’s last mode. If Status Register error bits are

set, the Status Register can be cleared before issuing the next instruction. RST# must

remain at VIH. See Figure 28, “Program Suspend / Resume Flowchart” on page 66, and

Figure 29, “Erase Suspend / Resume Flowchart” on page 67.

If a suspended partition was placed in Read Array, Read Status Register, ID, or Query

mode during the suspend, the device remains in that mode and outputs data

corresponding to that mode after the program or erase operation is resumed. After

resuming a suspended operation, issue the read command appropriate to the read

operation. To read status after resuming a suspended operation, issue a Read Status

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