SATA Speed is quite low at IMX6D platform

[houjunjie]

Now we are using IMX6D platform and the kernal version of it is 4.1.15 to test SATA speed. The result of both Read and Write is only 67MB/s. And we tested the SSD in different ARM platform, the speed can achieve 500MB/s. This speed 67MB/s is even not meet SATA1.0.

Our project is quite urgent, please help to give us some advice. Thanks.

Junjie 

[igorpadykov]

Hi Junjie 

reason may be signal integrity issues (noise), one can try to improve

signal shape using IOMUXC_GPR13 register described in sect.36.4.14 GPR (IOMUXC_GPR13)

i.MX6DQ Reference Manual

http://www.nxp.com/docs/en/reference-manual/IMX6DQRM.pdf

Also one can recheck sata signal layout, using layout requirements provided in

i.MX6 System Development User’s Guide

https://www.nxp.com/docs/en/user-guide/IMX6DQ6SDLHDG.pdf

Best regards
igor
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[houjunjie]

Hi Igor:

Actually our layout is totally same as your reference design. And also we tested the SATA speed in your EVB with kernal 4.1.15 and we got same issue. The EVB is as below. Please help to check it.

[igorpadykov]

Hi Junjie 

please check

iMX6Q SATA performance (speed limit) 

Best regards
igor