Can i use EIM for data transfer from FPGA?

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Can i use EIM for data transfer from FPGA?

797 Views
Contributor III

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Ubuntu 12.04

Kernel 3.14

Yocto system

i.MX6DL sabresd board

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Hi everyone.

I want to data transfer from FPGA. (16bit data bus)

Can i use EMIF? If i want to use EMIF , what interface can i use?

MMDC? or WEIM?

I think to usually use EIM. right?

If the wrong decision, please tell us.

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If i use EIM, can i use like below?

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Can i have EIM example code or manual.. or other solution.. for data transfer use EIM from FPGA ?

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4 Replies

85 Views
NXP TechSupport
NXP TechSupport

Hi Hanseung

you are right, one can use eim interface, for example codes one can

look at attached sdk test and pdf document Chapter 7 Configuring the EIM Driver

Best regards

igor

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85 Views
Contributor III

Thank you for your time!

Can i have a question?

Max operating frequency for EIM data transfer is 104Mhz.

if when i use multiplexed address/data mode, is EIM data trasfer rate 52 Mhz?

Do you know that data transfer rate for multiplexed mode? 

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85 Views
Contributor III

we used EIM in multiplexed mode with an FPGA to do 32-bit transfers and got avg. cycle times of 456ns for a read and 436ns for a write.  The actual transfers were taking 156ns for read and 148ns for write and the i.MX6 was inserting about 300ns of delay between cycles (known issue discussed on these forums before).  I suspect it would be possible to shave a few cycles off of the read and write times with more work, but this was sufficient for us.

85 Views
NXP TechSupport
NXP TechSupport

clock requirements are the same in multiplexed address/data mode

and timing diagrams can be found in datasheet and RM (EIM chapter).