LH28F320BFHE-PBTLZ2 Datasheet, PDF (36/36 Pages) Sharp Electrionic Components – 32M (x16) Flash Memory

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A-3 STATUS REGISTER READ OPERATIONS
If AC timing for reading the status register described in specifications is not satisfied, a system processor can check the
status register bit SR.15 instead of SR.7 to determine when the erase or program operation has been completed.
Table A-3-1. Status Register Definition (SR.15 and SR.7)
NOTES:
SR.15 = WRITE STATE MACHINE STATUS: (DQ₁₅)
1 = Ready in All Partitions
0 = Busy in Any Partition
SR.7 = WRITE STATE MACHINE STATUS
FOR EACH PARTITION: (DQ₇)
1 = Ready in the Addressed Partition
0 = Busy in the Addressed Partition
SR.15 indicates the status of WSM (Write State
Machine). If SR.15="0", erase or program operation is in
progress in any partition.
SR.7 indicates the status of the partition. If SR.7="0",
erase or program operation is in progress in the addressed
partition. Even if the SR.7 is "1", the WSM may be
occupied by the other partition.
Address (A) ^VIH
V_IL
V_IH
CE# (E)
V_IL
V_IH
WE# (W)
V_IL
DQ_15-0
(D/Q)
V_IH
V_IL
(
SR.15
Partition
0
)
(R)
"1"
"0"
(
SR.7
Partition
0
)
(R)
"1"
"0"
(
SR.15
Partition
1
)
(R)
"1"
"0"
(
SR.7
Partition
1
)
(R)
"1"
"0"
(
SR.15
Partition
2
)
(R)
"1"
"0"
(
SR.7
Partition
2
)
(R)
"1"
"0"
(
SR.15
Partition
3
)
(R)
"1"
"0"
(
SR.7
Partition
3
)
(R)
"1"
"0"
Operation to Partition 0
VALID ADDRESS
within PARTITION 0
VALID
COMMAND
t_WHR0 (t_EHR0)
Operation to Partition 2
VALID ADDRESS
within PARTITION 2
VALID
COMMAND
t_WHR0 (t_EHR0)
PARTITION3 PARTITION2 PARTITION1 PARTITION0
Check SR.15 instead of
SR.7 in Partition 0
Check SR.15 instead of
SR.7 in Partition 2
Figure A-3-1. Example of Checking the Status Register
(In this example, the device contains four partitions.)
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