LRS1338A View Datasheet(PDF) - Sharp Electronics
Part Name
Description
MFG CO.
'LRS1338A' PDF : 36 Pages View PDF
Stacked Chip (8M Flash & 2M SRAM)
LRS1338A
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
suspend 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 Sus-
pend command is written. Polling status register bits
SR.7 and SR.2 can determine when the word write oper-
ation has been suspended (both will be set to ‘1’). Spec-
ification tWHRH1 defines the word write suspend latency.
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 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
command is written, the device automatically outputs
status register data when read (see Figure 9). VPP
must remain at VPPH (the same VPP level used for word
write) while in word write suspend mode. RP must also
remain at VIH or VHH (the same RP level used for word
write). WP must also remain VIL or VIH (the same WP
level used for word write).
Start
Write B0H
Read
Status Register
0
SR.7 =
1
SR.2 = 0
1
Write FFH
Read Array Data
Word
Write Completed
BUS
OPERATION
COMMAND
COMMENTS
Write
Read
Standby
Standby
Write
Read
Write
Word Write Data = B0H
Suspend Addr = X
Status Register Data
Addr = X
Check SR.7
1 = WSM Ready
0 = WSM Busy
Check SR.2
1 = Word Write Suspended
0 = Word Write Completed
Read
Array
Data = FFH
Addr = X
Read Array locations other
than that being written
Word Write Data = D0H
Resume Addr = X
Done No
Reading?
Yes
Write D0H
Write FFH
Word Write
Resumed
Read Array Data
Figure 9. Word Write Suspend/Resume Flowchart
LRS1338A-9
Data Sheet
17
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