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iMX6Q USB client full-speed eye-diagram issue

Question asked by Tony1z on Jan 27, 2016
Latest reply on Jan 28, 2016 by igorpadykov

Hi Sir,

       We designed our board with iMX6Q and measured USB client full-speed eye-diagram.

       The USB signal voltage level in full-speed cannot reach 3.3V. USB traces impedance is 90 ohm differential controlled.

       We tried to increase amplitude with setting register USBPHY1.TX.D_CAL=0x0 by memtool.

       The amplitude of full-speed USB signal increase a little but still cannot reach 3.3V. It only has around 2.6V amplitude. (Refer to attached bmp file)

       Any other software suggestion ?