Dear Sir or Madam,
Hello.
I have a question about Variable_Output_Data_Window of SD specification in i.MX6 series.
Refer to Frequency_Range_Consideration in SD specification Phsical Layer Specification V4.20.
Is MX supporting Variable_Output_Data_Window function?
[Q1]
There is description of "SDR-104" in data sheet and Reference manual.
There is not a specification like tODLY in SDR104 and it is automatically adjusted by Variable-delay function(CMD19).
Is i.MX6S/DL/D/Q supporting this feature?
And is it supporting both of SDR-104 and SDR-50?
[Q2]
In SDR104, is it automatically adjusted at the case of Write operation, too?
Best Regards,
12-Nov-2014
Keita
Solved! Go to Solution.
Hi Keita
1. instead tODLY there is tOD in
Table 56. SDR50/SDR104 Interface Timing Specification IMX6DQCEC
CMD19 is supported for SDR-104.
2. yes, there is special uSDHC DLL for such purpose, please check
sect.67.5.3.2.4 DLL (Delay Line) in Read Path IMX6DQRM
Best regards
igor
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Hi Keita
1. instead tODLY there is tOD in
Table 56. SDR50/SDR104 Interface Timing Specification IMX6DQCEC
CMD19 is supported for SDR-104.
2. yes, there is special uSDHC DLL for such purpose, please check
sect.67.5.3.2.4 DLL (Delay Line) in Read Path IMX6DQRM
Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
Hi Igor,
>2. yes, there is special uSDHC DLL for such purpose, please check
>sect.67.5.3.2.4 DLL (Delay Line) in Read Path IMX6DQRM
Is this delay function support to write operation, too?
I haven't found the description in write path.
Best Regards,
Keita
Hi Keita
seems you are right:
delay function supports only read operation.
Best regards
igor
Hi Igor,
Hello.
[Description from "SD Physical Layer Specification 4.10"]
- Variable Output Data Window is supported in SDR104.
- At the initialization step the host should take care to find the optimal sampling point for the card output.
Let me clarify my understanding again. (It's important point.)
Is Variable_Output_Data_Window function support in i.MX6 only read operation?
In write operation, i.MX6 doesn't support this function, isn't it?
BR,
Keita
Hi Keita
I think "SD Physical Layer Specification 4.10" is not supported:
only 3.0 supported according to sect.67.1.1 Features IMX6DQRM
The features of the uSDHC module include the following:
• Conforms to the SD Host Controller Standard Specification version 3.0
Best regards
igor
Hi Igor,
• Conforms to the SD Host Controller Standard Specification version 3.0
My customer found the same description on v3.0.
Best Regards,
Keita
Hi Keita
please provide reference to this document and
page where it is described.
Best regards
igor
Hi Igor,
Please refer to "6.7.3.3.3Output Timing of Variable Window(SDR104 up to 208MHz) [page.161]" and "6.7.3.3.1Frequency Range Consideration [page.161]" in Physical Layer Specification v3.0.
BR,
Keita
Hi Keita
these chapters are for SD card output,
not for i.MX6 uSDHC module output.
SD 3.0 specification does not provide such requirements for Host.
In your original question:
"Is MX supporting Variable_Output_Data_Window function?"
- this seems refered to i.MX6 uSDHC module output.
Best regards
igor
Hi Igor,
>SD 3.0 specification does not provide such requirements for Host.
I will send you the mentioned point.
Please check it again.
BR,
Keita
Hi Igor,
Thank you for your reply.
Let me clarify it again.
Refer to Note.1 of Table 58. SDR50/SDR104Interface Timing Specification in IMX6SDLAEC(Rev.3).
There is description of "Data window in SDR100 mode is variable".
Is it support Variable_Output_Data_Window function in i.MX6 series of SDR50/104?
Best Regards,
Keita
Hi Keita
yes it supports.
Best regards
igor