GD25LB32DNIG datasheet(23/67 Pages) GIGADEVICE

No. de pieza	GD25LB32DNIG

Descripción Electrónicos	1.8V Uniform Sector Dual and Quad Serial Flash

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Fabricante Electrónico	GIGADEVICE [GigaDevice Semiconductor (Beijing) Inc.]

Página de inicio	http://www.gigadevice.com/

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23 / 67 page

1.8V Uniform Sector

Dual and Quad Serial Flash

GD25LB32D

23

7.8. Fast Read (0BH) in QPI mode

The Fast Read command is also supported in QPI mode. In QPI mode, the number of dummy clocks is configured

by the

“Set Read Parameters (C0H)” command to accommodate a wide range application with different needs for

either maximum Fast Read frequency or minimum data access latency. Depending on the Read Parameter Bits

P[5:4] setting, the number of dummy clocks can be configured as either 4/6/8.

Figure8a. Read Data Bytes at Higher Speed Sequence Diagram (QPI)

CS#

SCLK

IO0

IO1

IO2

IO3

0

1

2

3

4

5

Command

0BH

20

12

16

8

6

7

8

9

10

4

0

4

0

4

0

4

21

13

17

9

5

1

5

1

5

1

5

22

14

18

10

6

2

6

2

6

2

6

23

15

19

11

7

3

7

3

7

3

7

A23-16 A15-8

A7-0

Dummy*

11

12 13

IOs switch from

Input to output

Byte1

*"Set Read Parameters" Command (C0H)

can set the number of dummy clocks

Dummy*

7.9. Dual Output Fast Read (3BH)

The Dual Output Fast Read command is followed by 3-byte address (A23-A0) and a dummy byte, and each bit is

latched in on the rising edge of SCLK, then the memory contents are shifted out 2-bit per clock cycle from SI and SO.

The command sequence is shown in followed Figure9. 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.

Figure9. Dual Output Fast Read Sequence Diagram

Command

0

1

2

3

4

5

6

7

3BH

CS#

SCLK

SI

SO

High-Z

8

9 10

28 29 30 31

3

2

1

0

23 22 21

24-bit address

MSB

34 35 36 37

33

5

3

1

7

5

3

1

38 39

Data Out1

32

42 43 44 45

41

46 47

40

7

Data Out2

CS#

SCLK

SI

SO

MSB

Dummy Clocks

4

2

0

6

4

2

0

6

7

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GD25LB32DNIG Datasheet(PDF) 23 Page - GigaDevice Semiconductor (Beijing) Inc.

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