GD25LE256DFIS datasheet(33/83 Pages) GIGADEVICE

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1.8V Uniform Sector

Dual and Quad Serial Flash

GD25LE256D

Quad I/O Fast Read with

“Continuous Read Mode”

The Quad I/O Fast Read command can further reduce command overhead through setting the

“Continuous Read

Mode

” bits (M7-0) after the input 3-byte address (A23-A0) or a 4-byte address (A31-A0). If the “Continuous Read Mode”

bits (M5-4) = (1, 0), then the next Quad I/O Fast Read command (after CS# is raised and then lowered) does not require

the EBH command code. The command sequence is shown in followed Figure14a. If the

“Continuous Read Mode” bits (M5-

4) do not equal to (1, 0), the next command requires the first EBH command code, thus returning to normal operation.

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

Note: The device default is in 24-bit address mode. For 4-byte mode, the address length becomes 32-bit.

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.

CS#

SCLK

9 10 11 12 13 14 15

SI(IO0)

SO(IO1)

WP#(IO2)

HOLD#(IO3)

A23-16 A15-8 A7-0

M7-0

Dummy

Byte1 Byte2

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