AT25SF321B datasheet(21/61 Pages) DIALOG

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AT25SF321B

DS-AT25SF321B–179E–06-2020

7.6.2

Quad I/O Word Fast Read with 8-, 16-, 32-, 64-Byte Wrap Around in Standard SPI Mode

The Quad I/O Fast Read instruction also can be used to access a specific portion within a page by issuing a Set

Burst with Wrap (77h) instruction prior to E7h. The Set Burst with Wrap (77h) instruction can enable or disable the

Wrap Around feature for the following E7h instructions. When enabled, the data accessed can be limited to an 8-,

16-, 32-, or 64-byte section of a 256-byte page. The output data starts at the initial address specified in the

instruction when it reaches the ending boundary of the 8-, 16-, 32-, or 64-byte section. The output wraps around to

the beginning boundary automatically until CS is pulled high to terminate the instruction.

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-, or 64-bytes) of data without issuing multiple read instructions.

The Set Burst with Wrap instruction allows three Wrap Bits (W6-4) to be set. W4 enables or disables the wrap

around operation; W5 specifies the length of the wrap around section within a page.

7.7

Read Serial Flash Discoverable Parameter (5Ah)

The Serial Flash Discoverable Parameter (SFDP) standard provides a consistent method of describing the

functional and feature capabilities of serial Flash devices in a standard set of internal parameter tables. These

parameter tables can be interrogated by host system software to enable adjustments needed to accommodate

divergent features from multiple vendors. SFDP is a JEDEC Standard, JESD216D. For more detailed SFDP

values, contact Adesto.

Figure 7-12. Read Serial Flash Discoverable Parameter Command Sequence Diagram

DDDDDDDD

XXXXXXXX

AAAAA

AAA

MSB

LSB

MSB

01011010

Output Data Byte 1

8 Dummy Cycles

Address Bits A

23-A0

Opcode

10 11

829 30

33 34

37 38

41 42

45 46

SCK

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