GD25Q32CxIGx 3.3V Uniform Sector Dual and Quad Serial Flash
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The Burst with Wrap feature allows applications that use cache to quickly fetch a critical address and then fill
the cache afterwards within a fixed length (8/16/32/64-byte) of data without issuing multiple read commands.
The “Set Burst with Wrap” command allows three “Wrap Bits” W6-W4 to be set. The W4 bit is used to enable
or disable the “Wrap Around” operation while W6-W5 is used to specify the length of the wrap around section
within a page.
7.12. Quad I/O Word Fast Read (E7H)
The Quad I/O Word Fast Read command is similar to the Quad I/O Fast Read command except that the lowest
address bit (A0) must equal 0 and only 2-dummy clock. The command sequence is shown in followed Figure15.
The first byte addressed can be at any location. The address is automatically incremented to the next higher
address after each byte of data is shifted out. The Quad Enable bit (QE) of Status Register (S9) must be set to
enable for the Quad I/O Word Fast read command.
Quad I/O Word Fast Read with “Continuous Read Mode”
The Quad I/O Word Fast Read command can further reduce command overhead through setting the “Continuous
Read Mode” bits (M7-0) after the input 3-byte address (A23-A0). If the “Continuous Read Mode” bits (M5-4)
=(1, 0), then the next Quad I/O Word Fast Read command (after CS# is raised and then lowered) does not
require the E7H command code. The command sequence is shown in followed Figure16. If the “Continuous
Read Mode” bits (M5-4) do not equal to (1, 0), the next command requires the first E7H command code, thus
returning to normal operation. A “Continuous Read Mode” Reset command can be used to reset (M5-4) before
issuing normal command.
Figure 15. Quad I/O Word Fast Read Sequence Diagram (M5-4 ≠ (1, 0))
CS#
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
SCLK
Command
E7H
SI(IO0)
4
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
SO(IO1)
5
6
7
WP#(IO2)
HOLD#(IO3)
Dummy
A23-16 A15-8 A7-0 M7-0
Byte1 Byte2 Byte3
Rev.1.0
50 - 22
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