GD25Q21 Datasheet, PDF (25/49 Pages) ELM Electronics – Uniform Sector Dual and Quad Serial Flash

GD25Q21BxIGx Uniform Sector Dual and Quad Serial Flash
7.14. Set Burst with Wrap (77H)
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The Set Burst with Wrap command is used in conjunction with “Quad I/O Fast Read” and “Quad I/O Word
Fast Read” command to access a fixed length of 8/16/32/64-byte section within a 256-byte page, in standard SPI
mode. The Set Burst with Wrap command sequence: CS# goes low → Send Set Burst with Wrap command →
Send 24 dummy bits → Send 8 bits “Wrap bits” → CS# goes high.
W6, W5
W4=0
Wrap Around
Wrap Length
W4=1 (default)
Wrap Around
Wrap Length
0, 0
Yes
8-byte
No
N/A
0, 1
Yes
16-byte
No
N/A
1, 0
Yes
32-byte
No
N/A
1, 1
Yes
64-byte
No
N/A
If the W6-W4 bits are set by the Set Burst with Wrap command, all the following “Quad I/O Fast Read” and
“Quad I/O Word Fast Read” command will use the W6-W4 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
command should be issued to set W4=1.
Figure 18. Set Burst with Wrap Sequence Diagram
CS#
SCLK
SI(IO0)
SO(IO1)
WP#(IO2)
HOLD#(IO3)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Command
77H
xxxxxx4x
xxxxxx5x
xxxxxx6x
xxxxxxxx
W6-W4
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