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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.

Figure A-3-1. Example of Checking the Status Register

(In this example, the device contains four partitions.)

Table A-3-1. Status Register Definition (SR.15 and SR.7)

1 = Ready in All Partitions

0 = Busy in Any Partition

SR.7 = WRITE STATE MACHINE STATUS

1 = Ready in the Addressed Partition

0 = Busy in the Addressed Partition

NOTES:

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.

(D/Q)

(W)

(E)

(A)

Address

CE#

WE#

VALID ADDRESS

within PARTITION 0

VALID

COMMAND

"1"

"0"

(R)

SR.15

( Partition 0 )

"1"

"0"

(R)

SR.7

( Partition 0 )

"1"

"0"

(R)

SR.15

( Partition 1 )

"1"

"0"

(R)

SR.7

( Partition 1 )

"1"

"0"

(R)

SR.15

( Partition 2 )

"1"

"0"

(R)

SR.7

( Partition 2 )

"1"

"0"

(R)

SR.15

( Partition 3 )

"1"

"0"

(R)

SR.7

( Partition 3 )

PARTITION0

PARTITION1

PARTITION2

PARTITION3

Operation to Partition 0

VALID ADDRESS

within PARTITION 2

VALID

COMMAND

Operation to Partition 2

Check SR.15 instead of

SR.7 in Partition 0

Check SR.15 instead of

SR.7 in Partition 2

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