ECT25S40LP1CR datasheet(24/46 Pages) E-CMOS

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E-CMOS Corp. (www.ecmos.com.tw)

Page 24 of 46

4L08N-Rev.F001

ECT25S40

4M BIT SPI NOR FLASH

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”(77h)instruction prior to EBh. The “Set Burst with

Wrap”(77h) instruction can either enable or disable the “Wrap Around” feature for the

following EBh

instructions. When “Wrap Around” is enabled, the data being accessed can be

limited to either 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, 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 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 (8/16/32/64-byte) of data

Without issuing multiple read instructions.

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.

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

Once 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 will use the W6-4 setting to access the 8/16/32/64-

byte section within any pag

e. 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.

W4 = 0

W4 =1 (DEFAULT)

Wrap Around

Wrap Length

Wrap Around

Wrap Length

Yes

8-byte

N/A

Yes

16-byte

N/A

Yes

32-byte

N/A

Yes

64-byte

N/A

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