AT25SL641 datasheet(49/76 Pages) DIALOG

49 / 76 page

AT25SL641

DS-25SL641–113F–12/2018

Figure 7-50. Word Read Quad I/O Instruction (Previous instruction set M7-0 = Axh, SPI Mode)

Wrap Around in SPI mode

The Word 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 E7h. The Set Burst with Wrap instruction can either enable or disable the Wrap

Around feature for the following E7h commands. When Wrap Around is enabled, 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

wraps 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 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 is used to specify the length of the wrap around section within a page.

7.32

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. Before the device accepts the Set

Burst with Wrap instruction, a Quad enable of Status Register-2 must be executed (Status Register bit QE must equal 1).

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 - W0. The instruction sequence is shown in Set Burst with Wrap

Instruction Sequence. Wrap bit W7 and 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 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.

Table 7-8.

Encoding of W6 - W4 Wrap Bits

W6, W5

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

AT25SL641 датащи(PDF) 49 Page - Dialog Semiconductor

AT25SL641 датащи(HTML) 49 Page - Dialog Semiconductor

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 68 69 70 71 72 73 74 75 76

датащи скачать

ссылки URL