JS48F4400P0P3C0 datasheet(95/139 Pages) NUMONYX

95 / 139 page

April 2008

Datasheet

309823-10

Numonyx™ StrataFlash® Cellular Memory (M18)

When the Resume command is issued during a simultaneous erase-suspend/ program-

suspend condition, the programming operation is resumed first. Upon completion of the

programming operation, the Status Register should be checked for any errors, and

cleared. The resume command must be issued again to complete the erase operation.

Upon completion of the erase operation, the Status Register should be checked for any

errors, and cleared.

9.10

Simultaneous Operations

The multi-partition architecture of the flash device allows programming or erasing to

occur in one partition while reads are performed from another partition. Only status

reads are allowed in partitions that are busy programming or erasing.

Note:

When OTP Registercommands are issued to a parameter any partition address, the OTP

Registeris mapped onto that partition.

Table 45, “Read-While-Program and Read-While-Erase Rules” shows the rules for

reading from a partition while simultaneously programming or erasing within another

partition.

Note:

OTP Register, Device Information, CFI Query.

9.11

Security

The flash device incorporates features for protecting main-array contents and for

implementing system-level security schemes. The following sections describe the

available features.

9.11.1

Block Locking

Two methods of block-lock control are available: software and hardware. Software

control uses the Block Lock and Block Unlock commands; hardware control uses WP#

along with the Block Lock-Down command.

Upon power up or exit from reset, all main array blocks are locked, but not locked

down. Locked blocks cannot be erased or programmed.

Block lock and unlock operations are independent of the voltage level on VPP.

Table 46 summarizes the command bus-cycles.

Table 45: Read-While-Program and Read-While-Erase Rules

Read modes allowed when program/erase busy in partition A

Active Operation

Read Status

Array Reads

Non-Array Reads1

Main-Array Program

All partitions

All partitions except busy partition A

Main-Array Erase

All partitions

All partitions except busy partition A

OTP Register Program

All partitions

All partitions except busy partition A

Not allowed

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