©2011 Silicon Storage Technology, Inc. DS-25017A 04/11
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Serial Quad I/O (SQI) Flash Memory
SST26VF016 / SST26VF032
Data Sheet
Microchip Technology Company
Write-Suspend During Sector-Erase or Block-Erase
Issuing a Write-Suspend instruction during Sector-Erase or Block-Erase allows the host to program or
read any sector that was not being erased. The device will ignore any programming commands point-
ing to the suspended sector(s). Any attempt to read from the suspended sector(s) will output unknown
data because the Sector- or Block-Erase will be incomplete.
To execute a Write-Suspend operation, the host drives CE# low, sends the Write Suspend command
cycle (B0H), then drives CE# high. A cycle is two nibbles long, most significant nibble first. The Status
register indicates that the erase has been suspended by changing the WSE bit from ‘0’ to ‘1,’ but the
device will not accept another command until it is ready. To determine when the device will accept a
new command, poll the BUSY bit in the Status register or wait T
WS
.
Write-Suspend During Page Programming
Issuing a Write-Suspend instruction during Page Programming allows the host to erase or read any
sector that is not being programmed. Erase commands pointing to the suspended sector(s) will be
ignored. Any attempt to read from the suspended page will output unknown data because the program
will be incomplete.
To execute a Write Suspend operation, the host drives CE# low, sends the Write Suspend command
cycle (B0H), then drives CE# high. A cycle is two nibbles long, most significant nibble first. The Status
register indicates that the programming has been suspended by changing the WSP bit from ‘0’ to ‘1,’
but the device will not accept another command until it is ready. To determine when the device will
accept a new command, poll the BUSY bit in the Status register or wait T
WS
.
Write-Resume
Write-Resume restarts a Write command that was suspended, and changes the suspend status bit in
the Status register (WSE or WSP) back to ‘0’.
To execute a Write-Resume operation, the host drives CE# low, sends the Write Resume command
cycle (30H), then drives CE# high. A cycle is two nibbles long, most significant nibble first. To deter-
mine if the internal, self-timed Write operation completed, poll the BUSY bit in the Status register, or
wait the specified time T
SE
,T
BE
or T
PP
for Sector-Erase, Block-Erase, or Page-Programming, respec-
tively. The total write time before suspend and after resume will not exceed the uninterrupted write
times T
SE
,T
BE
or T
PP
.
Read Security ID
To execute a Read Security ID (SID) operation, the host drives CE# low, sends the Read Security ID
command cycle (88H), one address cycle, and then one dummy cycle. Each cycle is two nibbles long,
most significant nibble first.
After the dummy cycle, the device outputs data on the falling edge of the SCK signal, starting from the
specified address location. The data output stream is continuous through all SID addresses until termi-
nated by a low-to-high transition on CE#. The internal address pointer automatically increments until
the last SID address is reached, then outputs 00H until CE# goes high.
