GD25B64CSIG datasheet(34/57 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25B64C

7.25.

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

The Quad I/O Read Manufacturer/Device ID 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, and 4 dummy clocks. 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 Figure29. If the 24-bit address is initially set to

000001H, the Device ID will be read first.

Figure 29. Read Manufacture ID/ Device ID Quad I/O Sequence Diagram

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. 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

IO0

IO1

9 10 11 12 13 14 15

16 17 18 19 20 21 22 23

A23-16 A15-8 A7-0

M7-0

IO2

IO3

Dummy

MFR ID

DID

CS#

SCLK

24 25 26 27 28 29 30 31

MFR ID

(Repeat)

DID

(Repeat)

MFR ID

(Repeat)

DID

(Repeat)

IO0

IO1

IO2

IO3

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