
14
P/N:PM0867
MX28F160C3T/B
REV. 1.2, MAR. 17, 2004
However, SR.6 will remain "1" to indicate sector erase
suspend status.
The only other valid commands while sector erase is
suspended are Read Status Register, Read Configura-
tion, Read Query, Program Setup, Program Resume,
Sector Lock, Sector Unlock, Sector Lock-Down and sec-
tor erase Resume. After a Sector Erase Resume com-
mand is written to the flash memory, the WSM will con-
tinue the sector erase process. Status register bits SR.6
and SR.7 will automatically be cleared. After the Erase
Resume command is written, the device automatically
outputs status register data when read (see Figure 9).
VPP must remain at VPP1/2 while sector erase is sus-
pended. RP must also remain at VIH (the same RP level
used for sector erase). Sector cannot resume until word
write operations initiated during sector erase suspend
has completed.
If the time between writing the Sector Erase Resume
command and writing the Sector Erase Suspend com-
mand is shorter than 15ms and both commands are writ-
ten repeatedly, a longer time is required than standard
sector erase until the completion of the operation.
4.8 Word Write Suspend Command
The Word Write Suspend command allows word write
interruption to read data in other flash memory locations.
Once the word write process starts, writing the Word
Write Suspend command requests that the WSM sus-
pend the Word write sequence at a predetermined point
in the algorithm. The device continues to output status
register data when read after the Word Write Suspend
command is written. Polling status register bits SR.7 and
SR.2 can determine when the word write operation has
been suspended (both will be set to "1"). Specification
tWHRH1/tEHRH1 defines the word write suspend latency.
When Word Write Suspend command write to the CUI, if
word write was finished, the device places read array
mode. Therefore, after Word Write Suspend command
write to the CUI, Read Status Register command (70H)
has to be written to CUI, then status register bit SR.2
should be checked for if/when the device is in suspend
mode.
At this point, a Read Array command can be written to
read data from locations other than that which is sus-
pended. The only other valid commands while word write
is suspended are Read Status Register Read Configura-
tion, Read Query and Word Write Resume. After Word
Write Resume command is written to the flash memory,
the WSM will continue the Word write process. Status
register bits SR.2 and SR.7 will automatically be cleared.
After the Word Write Resume command is written, the
device automatically outputs status register data when
read (see Figure 7). VPP must remain at VPP1/2 while
in word write suspend mode. RP must also remain at
VIH (the same RP level used for word write).
If the time between writing the Word Write Resume com-
mand and writing the Word Write Suspend command is
short and both commands are written repeatedly, a longer
time is required than standard word write until the comple-
tion of the operation.