IS66/67WVR4M8ALL/BLL

Integrated Silicon Solution, Inc.- www.issi.com

17

Rev. A2

07/08/2024

5.5 QPI WRITE OPERATION

In QPI mode, either 02h or 38h command can be used for QPI write operation. It has nothing to do with

maximum frequency.

Figure 5.9 QPI Write 02h or 38h

CE#

CLK

Cmd

Write

SIO[3:0]

0

1

3

8

2

3

4

5

6

7

8

Data In 1

9

10

11

23:20

23:20

23:20

23:20

23:20

23:20

15:12

7:4

3:0

11:8

7:4

3:0

7:4

19:16

3:0

24 Bits Address

Data In 2

5.6 QPI EXIT OPERATION

This command will switch the device back into SPI mode.

Figure 5.10 QPI Mode Exit, F5h (Only available in QPI mode)

CE#

CLK

Cmd

Quad Mode

Exit

SIO[3:0]

0

1

F

5