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GD25Q128CXIGX Datasheet(PDF) 37 Page - ELM Electronics |
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GD25Q128CXIGX Datasheet(HTML) 37 Page - ELM Electronics |
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37 / 69 page  37 Rev.1.2 69 - http://www.elm-tech.com GD25Q128CxIGx 3.3V Uniform Sector Dual and Quad Serial Flash 7.20. Deep Power-Down (DP) (B9H) Executing the Deep Power-Down (DP) command is the only way to put the device in the lowest consumption mode (the Deep Power-Down Mode). It can also be used as an extra software protection mechanism, while the device is not in active use, since in this mode, the device ignores all Write, Program and Erase commands. Driving CS# high deselects the device, and puts the device in the Standby Mode (if there is no internal cycle currently in progress). But this mode is not the Deep Power-Down Mode. The Deep Power-Down Mode can only be entered by executing the Deep Power-Down (DP) command. Once the device has entered the Deep Power-Down Mode, all commands are ignored except the Release from Deep Power-Down and Read Device ID (RDI) command. This releases the device from this mode. The Release from Deep Power-Down and Read Device ID (RDI) command also allows the Device ID of the device to be output on SO. The Deep Power-Down Mode automatically stops at Power-Down, and the device always Power-Up in the Standby Mode. The Deep Power-Down (DP) command is entered by driving CS# low, followed by the command code on SI. CS# must be driven low for the entire duration of the sequence. The Deep Power-Down command sequence: CS# goes low → sending Deep Power-Down command → CS# goes high. The command sequence is shown in Figure22. CS# must be driven high after the eighth bit of the command code has been latched in; otherwise the Deep Power-Down (DP) command is not executed. As soon as CS# is driven high, it requires a delay of tDP before the supply current is reduced to ICC2 and the Deep Power- Down Mode is entered. Any Deep Power-Down (DP) command, while an Erase, Program or Write cycle is in progress, is rejected without having any effects on the cycle that is in progress. Figure 22. Deep Power-Down Sequence Diagram Command 0 1 2 3 4 5 6 7 B9H CS# SCLK SI tDP Stand-by mode Deep Power-down mode Figure 22a. Deep Power-Down Sequence Diagram (QPI) CS# SCLK IO0 IO1 IO2 IO3 0 1 Command B9H tDP Deep Power-down mode Stand-by mode |
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