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Serial Quad I/O (SQI) Flash Memory
A Microchip Technology Company
SST26VF016 / SST26VF032
Data Sheet
Write-Enable Latch (WEL)
The Write-Enable Latch (WEL) bit indicates the status of the internal memory’s Write-Enable Latch. If
the WEL bit is set to ‘1’, the device is write enabled. If the bit is set to ‘0’ (reset), the device is not write
enabled and does not accept any memory Program or Erase, Protection Register Write, or Lock-Down
commands. The Write-Enable Latch bit is automatically reset under the following conditions:
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Power-up
Reset
Write-Disable (WRDI) instruction completion
Page-Program instruction completion
Sector-Erase instruction completion
Block-Erase instruction completion
Chip-Erase instruction completion
Write-Block-Protection register instruction
Lock-Down Block-Protection register instruction
Program Security ID instruction completion
Lockout Security ID instruction completion
Write-Suspend instruction
Write Suspend Erase Status (WSE)
The Write Suspend-Erase Status (WSE) indicates when an Erase operation has been suspended. The
WSE bit is ‘1’ after the host issues a suspend command during an Erase operation. Once the sus-
pended Erase resumes, the WSE bit is reset to ‘0.’
Write Suspend Program Status (WSP)
The Write Suspend-Program Status (WSP) bit indicates when a Program operation has been sus-
pended. The WSP is ‘1’ after the host issues a suspend command during the Program operation. Once
the suspended Program resumes, the WSP bit is reset to ‘0.’
Write Protection Lockdown Status (WPLD)
The Write Protection-Lockdown Status (WPLD) bit indicates when the Block Protection register is
locked-down to prevent changes to the protection settings. The WPLD is ‘1’ after the host issues a
Lock-Down Block Protection command. After a power cycle, the WPLD bit is reset to ‘0.’
Security ID Status (SEC)
The Security ID Status (SEC) bit indicates when the Security ID space is locked to prevent a Write
command. The SEC is ‘1’ after the host issues a Lockout SID command. Once the host issues a Lock-
out SID command, the SEC bit can never be reset to ‘0.’
Busy
The Busy bit determines whether there is an internal Erase or Program operation in progress. If the
BUSY bit is ‘1’, the device is busy with an internal Erase or Program operation. If the bit is ‘0’, no Erase
or Program operation is in progress.
?2011 Silicon Storage Technology, Inc.
10
DS-25017A
04/11
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