GD25Q21 datasheet(25/49 Pages) ELM

25 / 49 page

Rev.1.1

49 -

http://www.elm-tech.com

GD25Q21BxIGx Uniform Sector Dual and Quad Serial Flash

W6, W5

W4=0

W4=1 (default)

Wrap Around

Wrap Length

Wrap Around

Wrap Length

0, 0

Yes

8-byte

N/A

0, 1

Yes

16-byte

N/A

1, 0

Yes

32-byte

N/A

1, 1

Yes

64-byte

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.

7.14. Set Burst with Wrap (77H)

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.

Figure 18. Set Burst with Wrap Sequence Diagram

Command

0 1 2 3 4 5 6 7

77H

CS#

SCLK

SI(IO0)

SO(IO1)

8 9 10 11 12 13 14 15

x x x x x x 4 x

x x x x x x 5 x

W6-W4

x x x x x x 6 x

x x x x x x x x

WP#(IO2)

HOLD#(IO3)

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