AT25QL641 datasheet(51/77 Pages) DIALOG

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AT25QL641

DS-25QL641–130E–10/2018

Figure 7-54. Burst Read with Wrap instruction (QPI Mode, 133 MHz)

7.34

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, t h e ‘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, please refer to the instruction. 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 8 bytes, the default number of dummy clocks is 4.

When the Set Read Parameters instruction is executed, an 8-bit value (P7-P0) is transferred to the memory. Within this 8-bit

value, bits P5-P4 are used to set the number of dummy clocks and the maximum read frequency as shown in Table 7-7. The

P1-P0 bits are used to set the wrap length as shown in Table 7-8. All other bits are unused.

Table 7-7.

Encoding of P[5:4] Bits

P5, P4

Dummy

Clocks

Maximum

Read Frequency

80 MHz

104 MHz

133 MHz

Table 7-8.

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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