JS28F320J3F75 datasheet(35/67 Pages) NUMONYX

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Numonyx® Embedded Flash Memory (J3 65 nm) Single Bit per Cell (SBC)

Datasheet

9.0

Flash Operations

This section describes the operational features of flash memory. Operations are

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

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

using bus-write cycles (see Chapter 8.0, “Bus Interface”). A complete list of available

command codes can be found in Section 11.0, “Device Command Codes” on page 47.

9.1

Status Register

The Status Register (SR) is an 8-bit, read-only register that indicates device status and

operation errors. To read the Status Register, issue the Read Status Register command.

Subsequent reads output Status Register information on DQ[7:0], and 00h on

DQ[15:8].

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

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

reset, the Status Register defaults to 80h. Page-mode reads are not supported in this

read mode. Status Register contents are latched on the falling edge of OE# or CEX (CEX

low is defined as the combination of pins CE0, CE1, and CE2 that enable the device.

CEX high is defined as the combination of pins CE0, CE1, and CE2 that disable the

device). OE# must toggle to VIH or the device must be disabled before further reads to

update the Status Register latch. The Read Status Register command functions

independently of VPEN voltage.

Table 20 shows Status Register bit definitions.

Table 20: Status Register Bit Definitions

Status Register (SR)

Default Value = 80h

Ready

Status

Erase

Suspend

Status

Erase

Error

Program

Error

Program/

Erase

Voltage

Error

Program

Suspend

Status

Block-Locked

Error

Reserved

Bit

Name

Description

7Ready Status

0 = Device is busy. SR[6:0] are invalid (Not driven);

1 = Device is ready. SR[6:0] are valid.

6Erase Suspend Status

0 = Erase suspend not in effect.

1 = Erase suspend in effect.

Erase Error

Command

Sequence

Error

SR.5 SR.4

0 = Program or erase operation successful.

1 = Program error - operation aborted.

0 = Erase error - operation aborted.

1 = Command sequence error - command aborted.

Program

Error

Program/Erase Voltage Error

0 = Within acceptable limits during program or erase operation.

1 = Not within acceptable limits during program or erase operation - Operation

aborted.

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.

Reserved

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