SST25VF040 datasheet(6/23 Pages) SST | 2 Mbit / 4 Mbit SPI Serial Flash

6 page

EOL Product Data Sheet

2 Mbit / 4 Mbit SPI Serial Flash

SST25VF040

S71231(04)-00-000

10/06

Status Register

The software status register provides status on whether the

flash memory array is available for any Read or Write oper-

ation, whether the device is Write enabled, and the state of

the memory Write protection. During an internal Erase or

Program operation, the status register may be read only to

determine the completion of an operation in progress.

Table 4 describes the function of each bit in the software

status register.

Busy

The Busy bit determines whether there is an internal Erase

or Program operation in progress. A “1” for the Busy bit indi-

cates the device is busy with an operation in progress. A “0”

indicates the device is ready for the next valid operation.

Write Enable Latch (WEL)

The Write-Enable-Latch bit indicates the status of the inter-

nal memory Write Enable Latch. If the Write-Enable-Latch

bit is set to “1”, it indicates the device is Write enabled. If the

bit is set to “0” (reset), it indicates the device is not Write

enabled and does not accept any memory Write (Program/

Erase) commands. The Write-Enable-Latch bit is automati-

cally reset under the following conditions:

•

Power-up

•

Write-Disable (WRDI) instruction completion

•

Byte-Program instruction completion

•

Auto Address Increment (AAI) programming

reached its highest memory address

•

Sector-Erase instruction completion

•

Block-Erase instruction completion

•

Chip-Erase instruction completion

TABLE

4: Software Status Register

Bit

Name

Function

Default at

Power-up

Read/Write

BUSY

1 = Internal Write operation is in progress

0 = No internal Write operation is in progress

WEL

1 = Device is memory Write enabled

0 = Device is not memory Write enabled

BP0

Indicate current level of block write protection (See Table 5)

R/W

BP1

Indicate current level of block write protection (See Table 5)

R/W

4:5

RES

Reserved for future use

N/A

AAI

Auto Address Increment Programming status

1 = AAI programming mode

0 = Byte-Program mode

BPL

1 = BP1, BP0 are read-only bits

0 = BP1, BP0 are read/writable

0R/W

T4.0 1231(04)

Part Number	Components Description	Html View	Manufacturer
M25P20	2 Mbit Low Voltage Serial Flash Memory With 40MHz SPI Bus Interface	1 2 3 4 5 More	STMicroelectronics
SST25VF010A	1 Mbit SPI Serial Flash	1 2 3 4 5 More	Silicon Storage Technology, Inc
SST25VF016B	16 Mbit SPI Serial Flash	1 2 3 4 5 More	Silicon Storage Technology, Inc
SST25LF020A	2 Mbit / 4 Mbit SPI Serial Flash	1 2 3 4 5 More	Silicon Storage Technology, Inc
M25P64_07	64 Mbit Low Voltage Serial Flash Memory With 50MHz SPI Bus Interface	1 2 3 4 5 More	STMicroelectronics
M25PE80	8 Mbit low-voltage Page-Erasable Serial Flash memory with Byte alterability 50MHz SPI bus standard pinout	1 2 3 4 5 More	STMicroelectronics
NX25F011B	1M-BIT 2M-BIT AND 4M-BIT SERIAL FLASH MEMORIES WITH 4-PIN SPI INTERFACE	1 2 3 4 5 More	List of Unclassifed Manufacturers
M29W200BT	2 Mbit 256Kb x8 or 128Kb x16 Boot Block Low Voltage Single Supply Flash Memory	1 2 3 4 5 More	STMicroelectronics
M29F400BT_06	4 Mbit 512Kb x8 or 256Kb x16 Boot Block single supply Flash memory	1 2 3 4 5 More	STMicroelectronics
SST39WF800A	8 Mbit x16 Multi-Purpose Flash	1 2 3 4 5 More	Silicon Storage Technology, Inc

Related Electronics Part Number

Link URL

Sponsor of Alldatasheet