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W25Q40BW
8.2.18
Set Burst with Wrap (77h)
The Set Burst with Wrap (77h) instruction is used in conjun ction with “Fast Read Quad I/O” and “Word
Read Quad I/O ” instructions to access a fixed length of 8/16/32/64-byte section within a 256-byte page.
Certain applications can benefit from this feature and improve the overall system code execution
performance.
Similar to a Quad I/O instruction, the Set Burst with Wrap instruction is initiated by driving the /CS pin low
and then shifting the instruction code “77h” foll owed by 24 dummy bits and 8 “Wrap Bits” , W7-0. The
instruction sequence is shown in figure 17. Wrap bit W7 and the lower nibble W3-0 are not used.
W4 = 0
W4 =1 (DEFAULT)
W6, W5
Wrap Around
Wrap Length
Wrap Around
Wrap Length
0
0
1
1
0
1
0
1
Yes
Yes
Yes
Yes
8-byte
16-byte
32-byte
64-byte
No
No
No
No
N/A
N/A
N/A
N/A
Once W6-4 is set by a Set Burst with Wrap instruction, all the following “Fast Read Quad I/O” and “Word
Read Quad I/O” instructions will use the W6-4 setting to access the 8/16/32/64-byte section within any
page. To exit the “Wrap Around” function and return to normal read operation, another Set Burst with
Wrap instruction should be issued to set W4 = 1. The default value of W4 upon power on is 1. In the case
of a system Reset while W4 = 0, it is recommended that the controller issues a Set Burst with Wrap
instruction to reset W4 = 1 prior to any normal Read instructions since W25Q40BW does not have a
hardware Reset Pin.
/CS
Mode 3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CLK
Mode 0
Instruction ( 77h )
IO 0
IO 1
IO 2
IO 3
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
w4
w5
w6
X
X
X
X
X
don ’ t care don ’ t care don ’ t care
Figure 17. Set Burst with Wrap Instruction Sequence
- 36 -
wrap bit
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