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W25Q128FVEIG Datasheet(PDF) 71 Page - Winbond |
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W25Q128FVEIG Datasheet(HTML) 71 Page - Winbond |
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71 / 97 page  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 2 33MHz 33MHz 40MHz 0 0 8-byte 0 1 4 55MHz 80MHz 80MHz 0 1 16-byte 1 0 6 80MHz 80MHz 104MHz 1 0 32-byte 1 1 8 80MHz 80MHz 104MHz 1 1 64-byte /CS CLK Mode 0 Mode 3 0 1 IO 0 IO 1 IO 2 IO 3 C0h 2 3 Read Parameters P4 P0 P5 P1 P6 P2 P7 P3 Instruction Mode 0 Mode 3 Figure 48. Set Read Parameters Instruction (QPI Mode only) |
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