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SST25WF040-40-5I-QAE Datasheet(PDF) 7 Page - Silicon Storage Technology, Inc

Part # SST25WF040-40-5I-QAE
Description  512 Kbit / 1 Mbit / 2 Mbit / 4Mbit 1.8V SPI Serial Flash
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Manufacturer  SST [Silicon Storage Technology, Inc]
Direct Link  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

SST25WF040-40-5I-QAE Datasheet(HTML) 7 Page - Silicon Storage Technology, Inc

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Data Sheet
512 Kbit / 1 Mbit / 2 Mbit / 4 Mbit 1.8V SPI Serial Flash
SST25WF512 / SST25WF010 / SST25WF020 / SST25WF040
7
©2009 Silicon Storage Technology, Inc.
S71328-08-000
11/09
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 Write-Enable-Latch memory. If the WEL 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 Write (Program/Erase) commands.
The Write-Enable-Latch bit is automatically reset under the
following conditions:
Device Reset
Power-up
Write-Disable (WRDI) instruction completion
Byte-Program instruction completion
Auto Address Increment (AAI) programming is
completed or reached its highest unprotected
memory address
Sector-Erase instruction completion
Block-Erase instruction completion
Chip-Erase instruction completion
Write-Status-Register instructions
Auto Address Increment (AAI)
The Auto Address Increment Programming-Status bit pro-
vides status on whether the device is in AAI programming
mode or Byte-Program mode. The default at power up is
Byte-Program mode.
TABLE
4: Software Status Register
Bit
Name
Function
Default at
Power-up
Read/Write
0
BUSY
1 = Internal Write operation is in progress
0 = No internal Write operation is in progress
0R
1
WEL
1 = Device is memory Write enabled
0 = Device is not memory Write enabled
0R
2
BP0
Indicate current level of block write protection (See Tables 5 through 8)
1
R/W
3
BP1
Indicate current level of block write protection (See Tables 5 through 8)
1
R/W
4
BP2
Indicate current level of block write protection (See Tables 5 through 8)
1
R/W
5
RES
Reserved for future use
0
N/A
6
AAI
Auto Address Increment Programming status
1 = AAI programming mode
0 = Byte-Program mode
0R
7
BPL
1 = BP1 and BP0 are read-only bits
0 = BP1 and BP0 are read/writable
0R/W
T4.1 1328


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