GD25Q32C datasheet(21/50 Pages) ELM

21 / 50 page

Rev.1.0

50 -

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GD25Q32CxIGx 3.3V Uniform Sector Dual and Quad Serial Flash

Quad I/O Fast Read with “Continuous Read Mode”

The Quad I/O 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 Fast Read command (after CS# is raised and then lowered) does not require the

EBH command code. The command sequence is shown in followed Figure14. If the “Continuous Read Mode”

bits (M5-4) do not equal to (1, 0), the next command requires the first EBH 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 13. Quad I/O Fast Read Sequence Diagram (M5-4 ≠ (1, 0))

Command

0 1 2 3 4 5 6 7

EBH

CS#

SCLK

SI(IO0)

SO(IO1)

8 9 10 11 12 13 14 15

4 0 4 0 4 0 4 0

16 17 18 19 20 21 22 23

4 0 4 0

5 1 5 1 5 1 5 1

5 1 5 1

A23-16 A15-8 A7-0 M7-0

6 2 6 2 6 2 6 2

6 2 6 2

7 3 7 3 7 3 7 3

7 3 7 3

WP#(IO2)

HOLD#(IO3)

Dummy

Byte1 Byte2

Figure 14. Quad I/O 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

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

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

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

disable the “Wrap Around” feature for the following EBH 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.

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