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W25Q40BL_12 Datasheet, PDF (31/74 Pages) Winbond – 2.5V 4M-BIT SERIAL FLASH MEMORY WITH DUAL AND QUAD SPI | |||
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W25Q40BL
Figure 14b. Fast Read Quad I/O Instruction Sequence (Previous instruction set M5-4 = 10)
Fast Read Quad I/O with â8/16/32/64-Byte Wrap Aroundâ
The Fast Read Quad I/O instruction can also be used to access a specific portion within a page by issuing
a âSet Burst with Wrapâ command prior to EBh. The âSet Burst with Wrapâ command can either enable or
disable the âWrap Aroundâ feature for the following EBh commands. When âWrap Aroundâ is enabled, the
data being accessed can be limited to either a 8, 16, 32 or 64-byte section of a 256-byte page. The output
data starts at the initial address specified in the instruction, once it reaches the ending boundary of the
8/16/32/64-byte section, the output will wrap around to 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 âSet Burst with Wrapâ instruction allows three âWrap Bitsâ, W6-4 to be set. The W4 bit is used to
enable or disable the âWrap Aroundâ operation while W6-5 are used to specify the length of the wrap
around section within a page. See 7.2.18 for detail descriptions.
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Publication Release Date: May 04, 2012
Revision D
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