ACE25AA320GFMTH datasheet(28/67 Pages) ACE

28 / 67 page

ACE25AA320G

Serial NOR Flash Memory

3.0V Multi I/O with 4KB, 32KB & 64KB Sector/Block Erase

VER 1.2

Quad I/O Word Fast Read with “8/16/32/64-Byte Wrap Around” in Standard SPI mode

The Quad I/O Word Fast Read command can be used to access a specific portion within a page by

issuing “Set Burst with Wrap” (77H) commands prior to E7H. The “Set Burst with Wrap” (77H) 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 an 8/16/32/64-byte section of a

256-byte page. The output data starts at the initial address specified in the command, once it reaches the

ending boundary of the 8/16/32/64- byte section, the output will wrap around 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”

command allows three “Wrap Bits” W6-W4 to be set. The W4 bit is used to enable or disable the “Wrap

Around” operation while W6-W5 is used to specify the length of the wrap around section within a page.

Set Burst with Wrap (77H)

The Set Burst with Wrap command is used in conjunction with “Quad I/O Fast Read” and “Quad I/O Word

Fast Read” command to access a fixed length of 8/16/32/64-byte section within a 256-byte page, in

standard SPI mode. The Set Burst with Wrap command sequence: CS# goes low →Send Set Burst with

Wrap command →Send 24 dummy bits →Send 8 bits “Wrap bits” →CS# goes high

W6,W5

W4=0

W4=1(default)

Wrap Around

Wrap Length

Wrap Around

Wrap Length

0,0

Yes

8-byte

N/A

0,1

Yes

16-byte

N/A

1,0

Yes

32-byte

N/A

1,1

Yes

64-byte

N/A

If the W6-W4 bits are set by the Set Burst with Wrap command, all the following “Quad I/O Fast Read”

and “Quad I/O Word Fast Read” command will use the W6-W4 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 command should be issued to set W4=1. In QPI mode, the “Burst Read with Wrap

(0CH)” command should be used to perform the Read Operation with “Wrap Around” feature. The Wrap

Length set by W5-W6 in Standard SPI mode is still valid in QPI mode and can also be re-configured by

“Set Read Parameters (C0H) command.

ACE25AA320GFMTH Datenblatt(PDF) 28 Page - ACE Technology Co., LTD.

ACE25AA320GFMTH Datenblatt(HTML) 28 Page - ACE Technology Co., LTD.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

Datenblatt Download

Link URL