GD25B256DFIS datasheet(53/82 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25B256D

7.29. Read Manufacture ID/ Device ID Quad I/O (94H)

The Read Manufacturer/Device ID Quad I/O 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 by quad I/O.

The command is initiated by driving the CS# pin low and shifting the command code “94H” followed by a 24-bit address

(A23-A0) of 000000H. After which, 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 Figure 61. If the 24-bit address is initially set to 000001H, the Device ID will be

read first.

Figure 61. Read Manufacture ID/ Device ID Quad I/O Sequence Diagram

7.30.

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.

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)

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