lrs1338a Sharp Microelectronics of the Americas, lrs1338a Datasheet - Page 17

• Manufacturer Part Number: lrs1338a
• Description: Stacked Chip Flash Memory Sram
• Manufacturer: Sharp Microelectronics of the Americas

Stacked Chip (8M Flash & 2M SRAM)
WORD WRITE SUSPEND COMMAND
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 t
Data Sheet
The Word Write Suspend command allows word
Read Array Data
WHRH1
Status Register
Word Write
Write B0H
Write FFH
Write D0H
Reading?
Resumed
SR.7 =
SR.2 =
Read
Done
Start
defines the word write suspend latency.
1
1
Yes
0
0
No
Figure 9. Word Write Suspend/Resume Flowchart
Read Array Data
Write Completed
Write FFH
Word
OPERATION
Standby
Standby
Write
Read
Write
Read
Write
BUS
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). V
must remain at V
write) while in word write suspend mode. RP must also
remain at V
write). WP must also remain V
level used for word write).
At this point a Read Array command can be written
Word Write
Word Write
COMMAND
Suspend
Resume
Read
Array
IH
or V
PPH
HH
(the same V
(the same RP level used for word
Data = B0H
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
Data = FFH
Addr = X
Read Array locations other
than that being written
Data = D0H
Addr = X
COMMENTS
IL
PP
or V
level used for word
IH
(the same WP
LRS1338A
LRS1338A-9
PP
17