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GD25D20C Datasheet(PDF) 22 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD25D20C Datasheet(HTML) 22 Page - GigaDevice Semiconductor (Beijing) Inc. |
22 / 43 page 3.3V Uniform Sector Standard and Dual Serial Flash GD25D40C/20C 22 Figure15. Release Power-Down and Read Device ID Sequence Diagram 7.15. Read Manufacture ID/ Device ID (REMS) (90H) The Read Manufacturer/Device ID command is an alternative to the Release from Power-Down / Device ID command that provides both the JEDEC assigned Manufacturer ID and the specific Device ID. The command is initiated by driving the CS# pin low and shifting the command code “90H” followed by a 24-bit address (A23-A0) of 000000H. After that, the Manufacturer ID and the Device ID are shifted out on the falling edge of SCLK with most significant bit (MSB) first as shown in Figure16. Figure16. Read Manufacture ID/ Device ID Sequence Diagram 7.16. 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. Any 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# low. Then, the 8-bit command code for the command is shifted in. This is Command 0 1 2 3 4 5 6 7 ABH CS# SCLK SI 8 9 29 30 31 MSB 2 1 0 3 Dummy Bytes 23 22 32 33 34 35 36 37 38 7 6 5 4 3 2 1 0 SO MSB t RES2 Stand-by Mode Deep Power-down Mode High-Z Device ID Command 0 1 2 3 4 5 6 7 90H CS# SCLK SI SO High-Z 8 9 10 28 29 30 31 3 2 1 0 23 22 21 24-bit address MSB 34 35 36 37 33 6 5 4 3 2 1 0 38 39 32 42 43 44 45 41 46 47 40 7 Device ID CS# SCLK SI SO MSB Manufacturer ID 6 5 4 3 2 1 0 7 |
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