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GD25Q128CXIGX Datasheet(PDF) 43 Page - ELM Electronics |
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GD25Q128CXIGX Datasheet(HTML) 43 Page - ELM Electronics |
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43 / 69 page  43 Rev.1.2 69 - http://www.elm-tech.com GD25Q128CxIGx 3.3V Uniform Sector Dual and Quad Serial Flash 7.25. Read Identification (RDID) (9FH) The Read Identification (RDID) command allows the 8-bit manufacturer identification to be read, followed by two bytes of device identification. The device identification indicates the memory type in the first byte, and the memory capacity of the device in the second byte. The Read Identification (RDID) command while an Erase or Program cycle is in progress is not decoded, and has no effect on the cycle that is in progress. The Read Identification (RDID) command should not be issued while the device is in Deep Power-Down Mode. The device is first selected by driving CS# to low. Then, the 8-bit command code for the command is shifted in. This is followed by the 24-bit device identification, stored in the memory, being shifted out on Serial Data Output, each bit being shifted out during the falling edge of Serial Clock. The command sequence is shown in Figure28. The Read Identification (RDID) command is terminated by driving CS# to high at any time during data output. When CS# is driven high, the device is put in the Standby Mode. Once in the Standby Mode, the device waits to be selected, so that it can receive, decode and execute commands. Figure 28. Read Identification ID Sequence Diagram Figure 28a. Read Identification ID Sequence Diagram (QPI) CS# SCLK IO0 IO1 IO2 IO3 0 1 2 3 4 5 Command 9FH 12 8 6 0 13 9 1 15 11 3 14 10 2 4 5 6 7 IOs switch from Input to Output MID JDID15 -JDID8 JDID7- JDID0 0 1 3 2 4 5 6 7 |
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