25Q20BWNIP View Datasheet(PDF) - Winbond

Part Name

Description

Manufacturer

25Q20BWNIP

1.8V 2M-BIT SERIAL FLASH MEMORY WITH DUAL AND QUAD SPI

Winbond 

W25Q20BW

4 0 4 04 0

5 1 5 15 1

6 2 6 26 2

7 3 7 37 3

Byte 1 Byte 2 Byte 3

Figure 15b. Word Read Quad I/O Instruction Sequence (Previous instruction set M5-4 = 10)

Word Read Quad I/O with “8/16/32/64-Byte Wrap Around”

The Word 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 E7h. The “Set Burst with Wrap” command can either

enable or disable the “Wrap Around” feature for the following E7h 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 8.2.18 for detail descriptions.

- 33 -

Publication Release Date: January 25, 2011

Preliminary - Revision B

Share Link: