GD25QL32CXIGX datasheet(40/62 Pages) ELM

40 / 62 page

Rev.1.0

62 -

http://www.elm-tech.com

GD25LQ32CxIGx 1.8V 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

Figure27. 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 27. Read Identification ID Sequence Diagram

0 1 2 3 4 5 6 7

CS#

SCLK

8 9 10

MSB

18 19 20 21

6 5 4 3 2 1 0

22 23

26 27 28 29

30 31

Capacity ID7-ID0

CS#

SCLK

MSB

Memory Type ID15-ID8

6 5 4 3 2 1 0

11 12 13 14 15

9FH

6 5 4 3 2 1 0

Manufacturer ID

MSB

Figure 27a. Read Identification ID Sequence Diagram (QPI)

CS#

SCLK

IO0

IO1

IO2

IO3

Command

9FH

12 8

13 9

15 11

14 10

IOs switch from

Input to Output

MID ID15-8 ID7-0

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