MX28F640C3T Macronix International, MX28F640C3T Datasheet - Page 16

• Manufacturer Part Number: MX28F640C3T
• Description: 64M-BIT [4M x16] CMOS SINGLE VOLTAGE 3V ONLY FLASH MEMORY
• Manufacturer: Macronix International

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 and sector erase
Resume. After a Sector Erase Resume command is writ-
ten to the flash memory, the WSM will continue the sec-
tor erase process. Status register bits SR.6 and SR.7
will automatically clear. After the Erase Resume com-
mand is written, the device automatically outputs status
register data when read (see Figure 4). VPP must re-
main at VPPH1/2 while sector erase is suspended. RE-
SET must also remain at VIL or VHH (the same RESET
level used for sector erase). WP must also remain at VIL
or VIH (the same WP level used for sector erase). Sec-
tor 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
tWHR11 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 write to CUI, then status register bit SR.2 should
be checked for placing the device 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 and Word Write
Resume. After Word Write Resume command is written
P/N:PM0900
16
to the flash memory, the WSM will continue the Word
write process. Status register bits SR.2 and SR.7 will
automatically clear. After the Word Write Resume com-
mand is written, the device automatically outputs status
register data when read (see Figure 4). VPP must re-
main at VPPH1/2 while in word write suspend mode.
RESET must also remain at VIL or VHH (the same RE-
SET 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.
MX28F640C3T/B
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REV. 0.6, AUG. 20, 2003