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W25Q16JVSSIQ Datasheet(PDF) 47 Page - Winbond |
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W25Q16JVSSIQ Datasheet(HTML) 47 Page - Winbond |
47 / 75 page W25Q16JV Publication Release Date: March 22, 2018, 2018 - 46 - Revision G Read Unique ID Number (4Bh) The Read Unique ID Number instruction accesses a factory-set read-only 64-bit number that is unique to each W25Q16JV device. The ID number can be used in conjunction with user software methods to help prevent copying or cloning of a system. The Read Unique ID instruction is initiated by driving the /CS pin low and shifting the instruction code “4Bh” followed by a four bytes of dummy clocks. After which, the 64- bit ID is shifted out on the falling edge of CLK as shown in Figure 42. Figure 42. Read Unique ID Number Instruction /CS CLK DI (IO 0) DO (IO 1) Mode 0 Mode 3 0 1 2 3 4 5 6 7 Instruction (4Bh) High Impedance 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 /CS CLK DI (IO 0) DO (IO 1) 24 25 26 27 28 29 30 31 32 33 34 36 37 38 35 23 Mode 0 Mode 3 * Dummy Byte 1 Dummy Byte 2 39 40 41 42 Dummy Byte 3 Dummy Byte 4 63 62 61 2 1 0 64-bit Unique Serial Number High Impedance = MSB * |
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