i.mx6 can't connect with USB

[yun1405007]

    Hi everybody:   According to the official manual,we design circuit again about  I.MX6 processor,now,we tested the board yestoday,But,

the board can't be recognised in USB.VDDCORE and VDDSOC is 1.4V, VDD_HIGH_IN and NSNVS are 3.0V.All supply voltages

are in line with  the official manual.There are nothing wrong in multiplexing I / O ports and power-up sequence,However,we alway can't connect with USB.To our strange,when VDDCORE and VDDSOC voltage at around 1.2V ,USB can be connected,but Loading image fails .

thanks

[CarlosCasillas]

Hi,

You could refer to section 3.11 “USB recommendations” of the “Hardware Development Guide for i.MX 6Quad, 6Dual, 6DualLite, 6Solo Families of Applications Processo...” document and to section 3.4.1.2 “USB” of the application note AN3951 “i.MX Layout Recommendations”.

Hope this will be useful for you.
Best regards!
/Carlos
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