JS48F4400P0P3C0 datasheet(77/139 Pages) NUMONYX

77 / 139 page

April 2008

Datasheet

309823-10

Numonyx™ StrataFlash® Cellular Memory (M18)

9.1.1

Clearing the Status Register

The Status Register (SR) contain status and error bits which are set by the device. SR

status bits are cleared by the device; however, SR error bits are cleared by issuing the

Clear Status Register command. Resetting the device also clears the Status Register.

Depending on the current state of the partition, issuing the Clear Status Command will

place the addressed partition in Read Status mode. Please see 'Next State' Table for

further details. Other partitions are not affected.

Note:

Care should be taken to avoid Status Register ambiguity. If a command sequence error

occurs while in an Erase Suspend condition, the Status Register will indicate a

Command Sequence error by setting SR4 and SR5. When the erase operation is

resumed (and finishes), any errors that may have occurred during the erase operation

will be masked by the Command Sequence error. To avoid this situation, clear the

Status Register prior to resuming a suspended erase operation.

The Clear Status Register command functions independent of the voltage level on VPP.

9.2

Read Configuration Register

The Read Configuration Register (RCR) is a 16-bit read/write register used to select

bus-read modes, and to configure synchronous-burst read characteristics of the flash

device. All Read Configuration Register bits are set and cleared using the Program Read

Configuration Register command.

Program Suspend Status

0 = Program suspend not in effect.

1 = Program suspend in effect.

1Block-Locked Error

0 = Block NOT locked during program or erase - operation successful.

1 = Block locked during program or erase - operation aborted.

Partition Status

SR7

SR0

0 = Active program or erase operation in addressed partition.

BEFP: Program or Verify complete, or Ready for data.

1 = Active program or erase operation in other partition.

BEFP: Program or Verify in progress.

0 = No active program or erase operation in any partition.

BEFP: Operation complete

11 = Reserved.

Table 29: Status Register Bit Definitions (Sheet 2 of 2)

Status Register (SR) Bits

Default Value = 0080h

Reserved

Region

Program

Status

Ready

Status

Erase

Suspend

Status

Erase

Error

Program

Error

Program

/Erase

Voltage

Error

Program

Suspend

Status

Block-

Locked

Error

Partition

Status

15-10

9-8

Bit

Name

Description

Table 30: Clear Status Register Command Bus Cycles

Command

Setup Write Cycle

Confirm Write Cycle

Address Bus

Data Bus

Address Bus

Data Bus

Clear Status Register

Device Address

0050h

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