GPMI Timing for i.MX8M Mini

jimmyli — Sun, 01 May 2022 03:02:53 GMT

Hi，

We are going to take GPMI interface to drive NandFlash on i.MX8M Mini platform.

But, we meet the timing problem that we haven't found the reason yet.

Help you can help us. Thanks.

----Details:

1>Configuration

work mode: ONFI Source Synchronous Mode, shown as below.

config: SSYNCMODE = 1 and GPMI_CLK_DIV2_EN = 1, for GPMI_CTRL1n

GPMI_TIMING2 do not be modified.

Clock is changed to 100MHz, showed as below.

2>Question

According to the i.MX8M Mini Reference Manual, when I send 16 bytes data, it will have 8 DQS signals, but actually, it has 16 DQS.

I don't understand why it happen?

Does it some where I never config or fault configuartion?

----ONFI Source Synchronous Mode

jimmyli_1-1651373608110.png i.MX8M Mini RM, P2328

----100MHz clock config

jimmyli_0-1651373530489.png

----Actual wave

jimmyli_2-1651374153941.png

topic GPMI Timing for i.MX8M Mini in i.MX Processors