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BR25S □□□ Series
● Method to cancel each command
○ READ, RDSR
? Method to cancel : cancel by CSB = “H”.
Technical Note
Ope code
8 bits
Address
16 bits
Data
8 bits
Ope code
8 bits
Data
8 bits
Cancel available in all areas of read mode
Fig.40 READ cancel valid timing
Cancel available in all
areas of rdsr mode
Fig.41 RDSR cancel valid timing
○ WRITE 、 PAGE WRITE
a ： Ope code or address input area
Cancellation is available by CSB=”H”.
b ： Data input area (D7 ～ D1 input area)
Ope code
8bits
a
Address
16bits
Data
8bits
b
tE/W
d
Cancellation is available by CSB=”H”.
c ： Data input area (D0 area)
In this area, cancellation is not available.
When CSB is set HIGH, write starts.
SCK
c
d ： tE/W area
SI
D7
D6
D5
D4
D3
D2
D1
D0
In the area c, by rising CSB, write starts.
b
c
While writing, by any input, cancellation cannot be made.
Fig.42 WRITE cancel valid timing
Note1) If Vcc is made OFF during write execution, designated address data is not guaranteed, therefore write it once again.
Note2) If CSB is rised at the same timing as that of the SCK rise, write execution / cancel becomes unstable, therefore, it is
recommended to rise in SCK = “L” area. As for SCK rise, assure timing of tCSS / tCSH or more.
○ WRSR
a ： From ope code to 15-th clock rise
SCK
14
15
16
17
Cancellation is available by CSB=”H”.
b ： From 15-th clock rise to 16-th clock rise (write enable area)
SI
D1
D0
In this area, cancellation is not available.
a
b
c
When CSB is set HIGH, write starts.
c ： After 16-th clock rise.
Ope code
Data
tE/W
Cancellation is available by CSB=”H”.
However, if write starts (CSB is rised)
8 bits
a
8 bits
c
in the area b, cancellation cannot be made by any means.
And, by inputting on SCK clock, cancellation cannot be made.
b
Fig.43 WRSR cancel valid timing
Note1) If Vcc is made OFF during write execution, designated address data is not guaranteed, therefore write it once
again
Note2) If CSB is rised at the same timing as that of the SCK rise, write execution / cancel becomes unstable, therefore, it
is recommended to rise in SCK = “L” area. As for SCK rise, assure timing of tCSS / tCSH or more.
○ WREN/WRDI
SCK
6
7
8
a ： From ope code to 7-th clock rise, cancellation is available by CSB = “H”.
b ： Cancellation is not available 7-th clock.
Ope code
8 bits
a
b
Fig.44 WREN/WRDI cancel valid timing
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
11/18
2010.12 - Rev.B
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