W25Q40BLSVIP datasheet(31/74 Pages) WINBOND

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W25Q40BL

Publication Release Date: May 04, 2012

- 31 -

Revision D

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 commands. 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” 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.

W25Q40BLSVIP Arkusz danych(PDF) 31 Page - Winbond