ACE25QC200GL datasheet(29/64 Pages) ACE

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ACE25QC200GL

2M BIT SPI NOR FLASH

VER 1.1

Set Burst with Wrap (77h)

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

“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 Figure16. Wrap bit W7 and the lower nibble W3-0 are not used.

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

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

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 or after a software reset is 1.

ID and Power Instructions

Deep Power-down (B9h)

Although the standby current during normal operation is relatively low, standby current can be further

reduced with the Power-down instruction. The lower power consumption makes the Power-down

instruction

especially

useful

for

battery

powered

applications

(See

ICC1

and

ICC2

Characteristics.)The instruction is initiated by driving the /CS pin low and shifting the instruction code “B9h”

as shown in Figure 17.

Figure16. Set Burst with Wrap Instruction

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