JS48F4400P0P3W0 datasheet(76/139 Pages) NUMONYX

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Numonyx™ StrataFlash® Cellular Memory (M18)

Datasheet

April 2008

309823-10

9.0

NOR Flash Operations

This section describes the operational features of NOR flash memory. Operations are

command-based—command codes are first issued to the device, and then the device

performs the desired operation. All command codes are issued to the device using bus-

write cycles as explained in Section 3.0, “NOR Flash Bus Interface” on page 10. A

complete list of available command codes can be found in Section 5.0, “Device

Command Codes” on page 40.

9.1

Status Register

The Status Register (SR) is a 16-bit, read-only register that indicates device and

partition status, and operational errors. To read the Status Register, issue the Read

Status Register command. Subsequent reads output Status Register information on

AD/DQ[15:10].

SR status bits are set and cleared by the device. SR error bits are set by the device,

and must be cleared using the Clear Status Register command. Upon power-up or exit

from reset, the Status Register defaults to 0080h.

Table 29: Status Register Bit Definitions (Sheet 1 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

543

Bit

Name

Description

15-10

Reserved

Reserved for future use; these bits will always be set to zero.

9-8

Region Program Status

SR9

SR8

0 = Region program successful.

0 = Region program error - Attempted write with object data to Control

Mode region.

1 = Region program error - Attempted rewrite to Object Mode region.

1 = Region program error - Attempted write using illegal command.

SR4 will also be set along with SR[8,9] for the above error

conditions.

7Ready Status

0 = Device is busy; SR[9:8], SR[6:1] are invalid;

1 = Device is ready; SR[9:8], SR[6:1] are valid.

Erase Suspend Status

0 = Erase suspend not in effect.

1 = Erase suspend in effect.

Erase

Error /

Blank

Check

Error

Command

Sequence Error

SR5

SR4

0 = Program or erase operation successful.

1 = Program error - operation aborted.

0 = Erase error: operation aborted / Blank check error: operation failed.

1 = Command sequence error - command aborted.

Program

Error

3VPP Error

0= VPP within acceptable limits during program or erase operation.

1= VPP not within acceptable limits during program or erase operation.

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