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W25Q40BW
Figure 14b. Fast Read Quad I/O Instruction Sequence (Previous instruction set M5-4 = 10)
Fast Read Quad I/O with “8/16/32/64 - Byte Wrap Around”
The Fast Read Quad I/O instruction can also be used to access a specific portion within a page by
issuing a “ Set Burst with Wrap ” command prior to EBh. The “Set Burst with Wrap” command can either
enable or disable the “Wrap Around” feature for the following EBh comman ds . When “Wrap Around” 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 “Set Burst with Wrap” instruction allows three “Wrap Bits”, W6 -4 to be set. The W4 bit is used to
enable or disable the “Wrap Around” operatio n while W6-5 are used to specify the length of the wrap
around section within a page. See 8.2.18 for detail descriptions.
Publication Release Date: October 11, 2013
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Revision F
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