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AT25QL128A

DS-AT25QL128A–129E–01-2021

8.33 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) and 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, see the specific instruction; for details, see

Table 8-2, Table 8-3, Table 8-4, and Table 8-5. The Wrap Length is set by W6-5 bit in the Set Burst with Wrap

(77h) instruction. This setting remains 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 eight bytes, the default number of dummy

clocks is four.

Figure 8-55. Set Read Parameters instruction (QPI Mode)

Table 8-7.

Encoding of P[5:4] Bits

P5, P4

Dummy

Clocks

Maximum

Read Frequency

80 MHz

104 MHz

133 MHz

Table 8-8.

Encoding of P[1:0] Bits

P1, P0

Wrap Length

0 0

8-byte

0 1

16-byte

1 0

32-byte

1 1

64-byte

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