AT25QL641 datasheet(27/80 Pages) RENESAS

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DS-AT25QL641-130 Rev. G

Page 27

Sep 14, 2022

AT25QL641 Datasheet

8.8

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) command 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) commands, and to configure the number of bytes of Wrap Length for the Burst Read with Wrap

(0Ch) command.

In Standard SPI mode, the Set Read Parameters (C0h) command is not accepted. The dummy clocks for various

Fast Read commands in Standard/Dual/Quad SPI mode are fixed (see the command). The Wrap Length is set

by W6-5 bit in the Set Burst with Wrap (77h) command. 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 command is 8 bytes, the default number of dummy clocks is

When the Set Read Parameters command 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 12. The P1-P0 bits are used to set the wrap length as shown in Table 13. All other bits are

unused.

Figure 14. Set Read Parameters Command (QPI Mode)

Table 12. Encoding of P[5:4] Bits

P5, P4

Dummy

Clocks

Maximum

Read Frequency

80 MHz

104 MHz

133 MHz

Table 13. 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

SCK

Command

C0h

Read

Parameters

Mode 3

Mode 0

Mode 3

Mode 0

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