FM25D04C-1ACA1T View Datasheet(PDF) - FIDELIX

Part Name

Description

Manufacturer

FM25D04C-1ACA1T

32M-BIT Serial Flash Memory with 4KB Sectors, Dual and QuadI/O SPI

FIDELIX 

FM25Q32

11.2.32 Set Burst with Wrap (77h)

The Set Burst with Wrap (77h) instruction is used in conjunction with “Fast Read Quad I/O” and

“Word Read Quad I/O” instructions to access a fixed length of 8/16/32/64-byte section within a

256-byte page. Certain applications can benefit from this feature and improve the overall system

code execution performance.

Similar to a Quad I/O instruction, the Set Burst with Wrap instruction is initiated by driving the /CS

pin low and then shifting the instruction code “77h” followed by 24 dummy bits and 8 “Wrap Bits”,

W7-0. The instruction sequence is shown in Set Burst with Wrap Instruction Sequence.

Wrap bit W7 and the lower nibble W3-0 are not used.

W6, W5

00

01

10

11

W4 = 0

Wrap Around

Wrap Length

Yes

8-byte

Yes

16-byte

Yes

32-byte

Yes

64-byte

W4 = 1(Default)

Wrap Around

Wrap Length

No

N/A

No

N/A

No

N/A

No

N/A

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

instructions will use the W6-4 setting to access the 8/16/32/64-byte section within any page. To exit

the “Wrap Around” function and return to normal read operation, another Set Burst with Wrap

instruction should be issued to set W4 = 1. The default value of W4 upon power on is 1. In the

case of a system Reset while W4 = 0, it is recommended that the controller issues a Set Burst

with Wrap instruction to reset W4 = 1 prior to any normal Read instructions since FM25Q32 does

not have a hardware Reset Pin.

Set Burst with Wrap Instruction Sequence

preliminary(Aug.18.2010) 48

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