GD25B127DFJS datasheet(24/65 Pages) GIGADEVICE

24 / 65 page

3.3V Uniform Sector

Dual and Quad Serial Flash

GD25B127D

Figure14a. Quad I/O Word Fast Read Sequence Diagram (M5-4= (1, 0))

CS#

SCLK

9 10 11 12 13 14 15

SI(IO0)

SO(IO1)

IO2

IO3

A23-16 A15-8 A7-0

M7-0 Dummy Byte1 Byte2

Byte3

Quad I/O Word Fast Read

with “8/16/32/64-Byte Wrap Around” in Standard SPI Mode

The Quad I/O Word

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

with Wrap” (77H) commands prior to E7H. The “Set Burst with Wrap” (77H) command can either enable or disable the “Wrap

Around” feature for the following E7H 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.

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