W25Q256FVBIF-TR Datasheet, PDF (85/108 Pages) Winbond – 3V 256M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q256FV
8.2.44 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 1-3 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
00
2
01
4
10
6
11
8
MAXIMUM
READ FREQ.
33MHz
55MHz
80MHz
80MHz
MAXIMUM
READ FREQ.
(A[1:0]=0,0)
33MHz
80MHz
80MHz
80MHz
MAXIMUM
READ FREQ.
(A[1:0]=0,0
VCC=3.0V~3.6V)
40MHz
80MHz
104MHz
104MHz
P1 – P0
WRAP
LENGTH
00
01
10
11
8-byte
16-byte
32-byte
64-byte
/CS
CLK
IO₀
Mode 3
Mode 0
0123
Instruction _Read
C0h Parameters
P4 P0
Mode 3
Mode 0
IO₁
P5 P1
IO₂
P6 P2
IO₃
P7 P3
Figure 48. Set Read Parameters Instruction (QPI Mode only)
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Publication Release Date: February 11, 2015
Preliminary – Revision H