AT25SF081B datasheet(21/61 Pages) DIALOG

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Datasheet

5-Aug-2021

DS-AT25SF081B-189

Revision E

8-Mbit SPI Serial Flash Memory

with Dual-I/O and Quad-I/O Support

AT25SF081B

Datasheet

7.5.2 Set Burst with Wrap (77h)

The Set Burst with Wrap instruction is used in conjunction with the Quad I/O Fast Read and Quad I/O Word Fast Read instruction

to access a fixed length (8-, 16-, 32-, or 64-byte) section within a 256-byte page in standard SPI mode (see Table 5 and Figure 13).

Figure 13: Set Burst with Wrap Timing (SPI Mode)

The Set Burst with Wrap instruction sequence is: CS goes low

→ Send Set Burst with Wrap instruction → Send 24 Dummy bits

→ Send 8 “Wrap bits” → CS goes high.

If W6-4 is set by a Set Burst with Wrap instruction, all the following “Fast Read Quad I/O” and “Word Read Quad I/O” instructions

use the W6-4 setting to access the 8-, 16-, 32-, or 64-byte section within any page. To exit the “Wrap Around” function and return

to normal read operation, issue another Set Burst with Wrap instruction to set W4=1. The default value of W4 at power-on is 1.

Table 5: Set Burst with Wrap Instruction Functions

W6, W5

W4 = 0

W4 = 1 (Default)

Wrap Around

Wrap Length

Wrap Around

Wrap Length

Yes

8 bytes

N/A

Yes

16 bytes

N/A

Yes

32 bytes

N/A

Yes

64 bytes

N/A

I/O0

(SI)

SCK

I/O1

(SO)

MSB

01110111

410 11

816

Opcode

XXXX

HIGH-IMPEDANCE

XXXX

Byte 1

Byte 2

I/O2

(WP)

XXXX

I/O3

(HOLD)

XXXX

14 15

XX W4 X

XX W6 X

XXXX

XX W5 X

Byte 3

Byte 4

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