GD25Q41ASIGT datasheet(35/51 Pages) GIGADEVICE

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Uniform Sector

Dual and Quad Serial Flash

GD25Q21B

Command

94H

CS#

SCLK

SI(IO0)

SO(IO1)

9 10 11 12 13 14 15

16 17 18 19 20 21 22 23

A23-16 A15-8 A7-0

M7-0

WP#(IO2)

HOLD#(IO3)

Dummy

MFR ID

DID

CS#

SCLK

SI(IO0)

SO(IO1)

WP#(IO2)

HOLD#(IO3)

24 25 26 27 28 29 30 31

MFR ID

(Repeat)

DID

(Repeat)

MFR ID

(Repeat)

DID

(Repeat)

7.26.

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# 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 Figure31. 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 31. Read Identification ID Sequence Diagram

GD25Q41ASIGT Datasheet(PDF) 35 Page - GigaDevice Semiconductor (Beijing) Inc.

GD25Q41ASIGT Datasheet(HTML) 35 Page - GigaDevice Semiconductor (Beijing) Inc.

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