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W25Q128FVAIQ Datasheet(HTML) 48 Page - Winbond |
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W25Q128FVAIQ Datasheet(HTML) 48 Page - Winbond |
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W25Q128FV - 47 - 8.2.14 Set Burst with Wrap (77h) In Standard SPI mode, 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 Figure 28. Wrap bit W7 and the lower nibble W3-0 are not used. W6, W5 W4 = 0 W4 =1 (DEFAULT) Wrap Around Wrap Length Wrap Around Wrap Length 0 0 Yes 8-byte No N/A 0 1 Yes 16-byte No N/A 1 0 Yes 32-byte No N/A 1 1 Yes 64-byte No N/A 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 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/hardware reset is 1. In QPI mode, the “Burst Read with Wrap (0Ch)” instruction should be used to perform the Read operation with “Wrap Around” feature. The Wrap Length set by W5-4 in Standard SPI mode is still valid in QPI mode and can also be re-configured by “Set Read Parameters (C0h)” instruction. Refer to 8.2.44 and 8.2.45 for details. Wrap Bit /CS CLK Mode 0 Mode 3 0 1 IO 0 IO 1 IO 2 IO 3 2 3 4 5 X X X X X X X X don't care 6 7 8 9 don't care don't care 10 11 12 13 14 15 Instruction (77h) Mode 0 Mode 3 X X X X X X X X X X X X X X X X w4 X w5 X w6 X X X Figure 28. Set Burst with Wrap Instruction (SPI Mode only) |
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