About EIM Bus Timing Parameters in i.MX6DQ.

[keitanagashima]

Dear All,

I have questions about EIM Bus Timing Parameters in i.MX6DQ.

[Q1]

Refer to Table 40. EIM Bus Timing Parameters in IMX6SDLAEC(Rev.4).

There are both spec (min & max) in WE4~WE17.

On the other hand, refer to Table 41. EIM Bus Timing Parameters in IMX6DQAEC(Rev.3).

There aren't both spec (min & max) in WE4~WE17.

Why does i.MX6DQ have only the specification of the one (min or max)?

[Q2]

Refer to Table 41. EIM Asynchronous Timing Parameters Relative to Chip Select in IMX6DQAEC(Rev.3)

"WE31" : WE4 - WE6 - CSA  (Max : 3 - CSA)

If current data sheet of i.MX6DQ is right, we cannot calculate the max value from "WE4 - WE6 - CSA".

Because WE4 and WE6 hasn't min spec.

How should I think?

Best Regards,

Keita

[Yuri]

  Please look at my comments below.

1.

  As an example let’s consider WE4 parameter - clock rise to address valid : it defines address output delay,

and really have both values – minimal and maximal. But for practical purposes just maximal
value of address assertion delay is important. This is why only maximal parameter is provided

in the i.MX6 Q datasheet. 

2.
Again, for WE31 (EIM_CSx_B valid to Address Valid) the maximum delay is most important. It is

  (3 – CSA).

Have a great day,
Yuri

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[keitanagashima]

Dear Yuri,

Thank you for your reply.

Is the minimal spec of i.MX6DQ the same as the i.MX6SDL?

Best Regards,

Keita

[Yuri]

Strictly speaking, the minimal values are not specified.

Regards,

Yuri.

[keitanagashima]

Hi Yuri,

My customer must need to specification of blank space min or max to validate the EIM timing.

For example, It is necessary at the external device that a specification to Address valid - > OE valid is defined.

(The all spec specified in i.MX6SDL data sheet...)

Best Regards,

Keita

[karina_valencia]

ClayTurner​ can you help to  check this case?

[Clay_Turner · Accepted solution]

Keita,

We are currently updating the i.MX6DQ and the EIM timing parameters have been updated. This update fills in many of the empty values. The revision 4 datasheet is not yet published on the web but should be there within a few weeks. I have attached the EIM timing section for your reference. Hopefully, this will answer your questions.

Regards,

Clay