GD25Q80CSIG datasheet(31/67 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25Q80C

Figure 25. Read Manufacture ID/ Device ID Sequence Diagram

7.23.

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# 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. Each bit is shifted out on the falling edge of Serial Clock.

The command sequence is shown in Figure27. The Read Identification (RDID) command is terminated by driving CS# high

at any time during data output. When CS# is driven high, the device is in the Standby Mode. Once in the Standby Mode,

the device waits to be selected, so that it can receive, decode and execute commands.

Command

90H

CS#

SCLK

High-Z

9 10

28 29 30 31

23 22 21

24-bit address

MSB

34 35 36 37

38 39

42 43 44 45

46 47

Device ID

CS#

SCLK

MSB

Manufacturer ID

GD25Q80CSIG bảng dữ liệu(PDF) 31 Page - GigaDevice Semiconductor (Beijing) Inc.