Hi all,
I am confirming whether the IMX8M Plus has the WDQS function enabled?
I checked the RPA excel file, but I don't understand clearly.
Can you confirm this for me?
1. If it is enabled then, use Mode 1 or Mode 2 as shown below (From DDR datasheet)
2. In the RPA file, where can Enable/Disable be confirmed?
Thanks,
Hi, @haryanl
on i.MX8MP, we enable the WDQSEXTENSION feature of the DDR PHY whose description is as follows:
When set, DQS_T and DQS_C will be driven differentially to 0 and 1, respectively,
before and after a write burst, except during a memory read transaction.
From that I understand that DQS should be driven low at all times except a memory read transaction.
Here is measured the behavior of the system on 8MP EVK when WDQSEXTENSION is enabled and disabled:
Hi, @haryanl
on i.MX8MP, we enable the WDQSEXTENSION feature of the DDR PHY whose description is as follows:
When set, DQS_T and DQS_C will be driven differentially to 0 and 1, respectively,
before and after a write burst, except during a memory read transaction.
From that I understand that DQS should be driven low at all times except a memory read transaction.
Here is measured the behavior of the system on 8MP EVK when WDQSEXTENSION is enabled and disabled:
Hi @pengyong_zhang ,
Thank for your reply.
in the RPA file, is it confirmed here?
By default it is set to enabled
Because WDQS_Extension is used, is it correct that I understand that corresponds to DDR Mode 2: WDQS_on / WDQS_off definition based control?
Thanks,
