AT25QL321 datasheet(28/79 Pages) DIALOG

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AT25QL321

DS-25QL321–131C–5/2017

Fast Read Quad I/O in QPI mode

When QPI mode in enabled, the number of dummy clocks is configured by the “Set Read Parameters (C0h)” instruction

to accommodate a wide range applications with different needs for either maximum Fast Read frequency or minimum

data access latency. Depending on the Read Parameter Bits P [4] and P [5] setting, the number of dummy clocks can

be configured as either 4 or 6 or 8. The default number of dummy clocks upon power up or after a Reset (99h)

instruction is 4.

“Continuous Read Mode” feature is also available in QPI mode for Fast Read Quad I/O instruction. In QPI mode, the

“Continuous Read Mode” bits M7-0 are also considered as dummy clocks. In the default setting, the data output will

follow the Continuous Read Mode bits immediately.

“Wrap Around” feature is not available in QPI mode for Fast Read Quad I/O instruction. To perform a read operation with

fixed data length wrap around in QPI mode, a “Burst Read with Wrap” (0Ch) instruction must be used. (Please refer to

Section 7.32 Burst Read with Wrap).

Figure 7-20. Fast Read Quad I/O Instruction (Initial instruction or previous M7‐0 ≠ Axh, QPI mode, 80MHz)

Figure 7-21. Fast Read Quad I/O Instruction (Initial instruction or previous M7‐0 ≠ Axh, QPI mode, 104MHz)

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