GD25Q32C datasheet(23/50 Pages) ELM

23 / 50 page

Rev.1.0

50 -

http://www.elm-tech.com

GD25Q32CxIGx 3.3V Uniform Sector Dual and Quad Serial Flash

Figure 16. Quad I/O Word Fast Read Sequence Diagram (M5-4 = (1, 0))

0 1 2 3 4 5 6 7

CS#

SCLK

8 9 10 11 12 13 14 15

SI(IO0)

SO(IO1)

WP#(IO2)

HOLD#(IO3)

4 0 4 0

5 1 5 1

6 2 6 2

7 3 7 3

4 0 4 0

5 1 5 1

6 2 6 2

7 3 7 3

4 0 4 0

5 1 5 1

6 2 6 2

7 3 7 3

A23-16 A15-8 A7-0 M7-0 Dummy Byte1 Byte2

4 0

5 1

6 2

7 3

Byte3

Quad I/O Word Fast Read with “8/16/32/64-Byte Wrap Around” in Standard SPI mode

The Quad I/O Word Fast Read command can be used to access a specific portion within a page by issuing “Set

Burst with Wrap” (77H) commands prior to E7H. The “Set Burst with Wrap” (77H) command can either enable

or disable the “Wrap Around” feature for the following E7H commands. When “Wrap Around” is enabled, the

data being accessed can be limited to either an 8/16/32/64-byte section of a 256-byte page. The output data

starts at the initial address specified in the command, once it reaches the ending boundary of the 8/16/32/64-byte

section, the output will wrap around the beginning boundary automatically until CS# is pulled high to terminate

the command.

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.

7.13. 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.

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.

GD25Q32C Datasheet(PDF) 23 Page - ELM Electronics

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