GD25LQ32DNJS datasheet(27/72 Pages) GIGADEVICE

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1.8V Uniform Sector

Dual and Quad Serial Flash

GD25LQ32D

Quad I/O Fast Read with “8/16/32/64-Byte Wrap Around” in Standard SPI mode

The Quad I/O Fast Read

command can be used to access a specific portion within a page by issuing “Set Burst with

Wrap” (77H) commands prior to EBH. The “Set Burst with Wrap” (77H) command can either enable or disable the “Wrap

Around” feature for the following EBH commands. When “Wrap Around” is enabled, the data being accessed can be limited

to either an 8/16/32/64-byte section of a 256-byte page. The output data starts at the initial address specified in the

command, once it reaches the ending boundary of the 8/16/32/64-byte section, the output will wrap around the beginning

boundary automatically until CS# is pulled high to terminate the command.

The Burst with Wrap feature allows applications that use cache to quickly fetch a critical address and then fill the

cache afterwards within a fixed length (8/16/32/64-

byte) of data without issuing multiple read commands. The “Set Burst

with Wrap” command allows three “Wrap Bits” W6-W4 to be set. The W4 bit is used to enable or disable the “Wrap Around”

operation while W6-W5 is used to specify the length of the wrap around section within a page.

Quad I/O Fast Read (EBH) in QPI mode

The Quad I/O Fast Read command is also supported in QPI mode. See Figure12b. In QPI mode, the number of

dummy clocks is configured by the “Set Read Parameters (C0H)” command to accommodate a wide range application with

different needs for either maximum Fast Read frequency or minimum data access latency. Depending on the Read

Parameter Bits P[5:4] setting, the number of dummy clocks can be configured as either 4/6/8. In QPI mode, the

“Continuous Read Mode” bits M7-M0 are also considered as dummy clocks. “Continuous Read Mode” feature is also

available in QPI mode for Quad I/O Fast Read command. “Wrap Around” feature is not available in QPI mode for Quad I/O

Fast Read command. To perform a read operation with fixed data length wrap around in QPI mode, a dedicated “Burst

Read with Wrap” (0CH) command must be used.

Figure12b. Quad I/O Fast Read Sequence Diagram (M5-4= (1, 0) QPI)

CS#

SCLK

IO0

IO1

IO2

IO3

Command

EBH

A23-16

A15-8

A7-0

M7-0*

12 13

IOs switch from

Input to output

dummy* Byte1

Byte2

*"Set Read Parameters"

Command (C0H) can

set the number of

dummy clocks

GD25LQ32DNJS Datasheet(PDF) 27 Page - GigaDevice Semiconductor (Beijing) Inc.

GD25LQ32DNJS Datasheet(HTML) 27 Page - GigaDevice Semiconductor (Beijing) Inc.

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