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W25Q64FV
6.2.19
Set Burst with Wrap (77h)
In Standard SPI mode, t he Set Burst with Wrap (77h) instruction is used in conjunction 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” followed by 24 dummy bits and 8 “Wrap Bits”, W7 -0. The
instruction sequence is shown in Figure 18. 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 W25Q64FV does not have a
hardware Reset Pin.
In QPI mode, the “Burst Read with Wrap (0Ch)” instruction should be used to perform t he Read operation
with “Wrap Around” feature. The Wrap Length set by W5-4 in Standard SPI mode is still valid in QPI
mode and can also be re- configured by “Set Read Parameters (C0h)” instruction. Refer to 7.2.38 and
7.2.39 for details.
/CS
Mode 3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Mode 3
CLK
Mode 0
Mode 0
Instruction (77h)
don't
care
don't
care
don't
care
Wrap Bit
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
Figure 18. Set Burst with Wrap Instruction (SPI Mode only)
- 43 -
Publication Release Date:
October 07, 2013
Revision L
发布紧急采购，3分钟左右您将得到回复。
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