W25Q128FVCIP datasheet(71/97 Pages) WINBOND

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W25Q128FV

Publication Release Date: October 01, 2012

- 70 -

Revision D

8.2.34 Set Read Parameters (C0h)

In QPI mode, to accommodate a wide range of applications with different needs for either maximum read

frequency or minimum data access latency, “Set Read Parameters (C0h)” instruction can be used to

configure the number of dummy clocks for “Fast Read (0Bh)”, “Fast Read Quad I/O (EBh)” & “Burst Read

with Wrap (0Ch)” instructions, and to configure the number of bytes of “Wrap Length” for the “Burst Read

with Wrap (0Ch)” instruction.

In Standard SPI mode, the “Set Read Parameters (C0h)” instruction is not accepted. The dummy clocks

for various Fast Read instructions in Standard/Dual/Quad SPI mode are fixed, please refer to the

Instruction Table 1-2 for details. The “Wrap Length” is set by W5-4 bit in the “Set Burst with Wrap (77h)”

instruction. This setting will remain unchanged when the device is switched from Standard SPI mode to

QPI mode.

The default “Wrap Length” after a power up or a Reset instruction is 8 bytes, the default number of

dummy clocks is 2. The number of dummy clocks is only programmable for “Fast Read (0Bh)”, “Fast

Read Quad I/O (EBh)” & “Burst Read with Wrap (0Ch)” instructions in the QPI mode. Whenever the

device is switched from SPI mode to QPI mode, the number of dummy clocks should be set again, prior to

any 0Bh, EBh or 0Ch instructions.

P5 – P4

DUMMY

CLOCKS

MAXIMUM

READ FREQ.

MAXIMUM

READ FREQ.

(A[1:0]=0,0)

MAXIMUM

READ FREQ.

(A[1:0]=0,0

VCC=3.0V~3.6V)

P1 – P0

WRAP

LENGTH

0 0

33MHz

40MHz

0 0

8-byte

0 1

55MHz

80MHz

0 1

16-byte

1 0

80MHz

104MHz

1 0

32-byte

1 1

80MHz

104MHz

1 1

64-byte

/CS

CLK

Mode 0

Mode 3

C0h

Read

Parameters

Instruction

Mode 0

Mode 3

Figure 48. Set Read Parameters Instruction (QPI Mode only)

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