W25Q16DVUUIG-TR Datasheet, PDF (39/80 Pages) Winbond – 3V 16M-BIT SERIAL FLASH MEMORY WITH DUAL AND QUAD SPI

7.2.18 Set Burst with Wrap (77h)
The 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 17. Wrap bit W7 and the lower nibble W3-0 are not used.
W6, W5
00
01
10
11
W4 = 0
Wrap Around
Wrap Length
Yes
8-byte
Yes
16-byte
Yes
32-byte
Yes
64-byte
W4 =1 (DEFAULT)
Wrap Around Wrap Length
No
N/A
No
N/A
No
N/A
No
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 W25Q16DV does not have a
hardware Reset Pin.
/CS
CLK
Mode 3
Mode 0
IO₀
IO₁
IO₂
IO₃
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Mode 3
Instruction (77h)
don't
care
don't
care
don't
care
Wrap Bit
Mode 0
X X X X X X w4 X
X X X X X X w5 X
X X X X X X w6 X
XXXXXXXX
Figure 17. Set Burst with Wrap Instruction Sequence
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Publication Release Date: January 26, 2015
Revision J