GD25LE256DFJS datasheet(50/83 Pages) GIGADEVICE

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1.8V Uniform Sector

Dual and Quad Serial Flash

GD25LE256D

7.27. 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 Figure29. 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.

Figure29. Read Identification ID Sequence Diagram

CS#

SCLK

9 10

MSB

18 19 20 21

22 23

26 27 28 29

30 31

Capacity ID7-ID0

CS#

SCLK

MSB

Memory Type ID15-ID8

11 12 13 14 15

9FH

Manufacturer ID

MSB

Figure29a. Read Identification ID Sequence Diagram (QPI)

CS#

SCLK

IO0

IO1

IO2

IO3

Command

9FH

IOs switch from

Input to Output

MID

ID15-8

ID7-0

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