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GD25B16C Datasheet(PDF) 33 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD25B16C Datasheet(HTML) 33 Page - GigaDevice Semiconductor (Beijing) Inc. |
33 / 53 page 3.3V Uniform Sector Dual and Quad Serial Flash GD25B16C 33 7.25. Read Unique ID (4BH) The Read Unique ID command accesses a factory-set read-only 128bit number that is unique to each device. The Unique ID can be used in conjunction with user software methods to help prevent copying or cloning of a system. The Read Unique ID command sequence: CS# goes low sending Read Unique ID command 3-Byte Address (000000H) Dummy Byte128bit Unique ID Out CS# goes high. Figure 29. Read Unique ID Sequence Diagram Command 0 1 2 3 4 5 6 7 4BH CS# SCLK SI SO High-Z 8 9 10 28 29 30 31 3 2 1 0 23 22 21 24-bit address (000000H) MSB 34 35 36 37 33 6 5 4 3 2 1 0 38 39 Data Out1 32 42 43 44 45 41 46 47 40 7 6 5 4 3 2 1 0 7 6 5 7 Data Out2 CS# SCLK SI SO MSB Dummy Byte 7.26. Program/Erase Suspend (PES) (75H) The Program/Erase Suspend command “75H”, allows the system to interrupt a page program or sector/block erase operation and then read data from any other sector or block. The Write Status Register command (01H) and Erase/Program Security Registers command (44H, 42H) and Erase commands (20H, 52H, D8H, C7H, 60H) and Page Program command (02H / 32H) are not allowed during Program/Erase suspend. Program/Erase Suspend is valid only during the page program or sector/block erase operation. A maximum of time of “tsus” (See AC Characteristics) is required to suspend the program/erase operation. The Program/Erase Suspend command will be accepted by the device only if the SUS bit in the Status Register equal to 0 and WIP bit equal to 1 while a Page Program or a Sector or Block Erase operation is on-going. If the SUS bit equal to 1 or WIP bit equal to 0, the Suspend command will be ignored by the device. The WIP bit will be cleared from 1 to 0 within “tsus” and the SUS bit will be set from 0 to 1 immediately after Program/Erase Suspend. A power-off during the suspend period will reset the device and release the suspend state. The command sequence is show in Figure30. |
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