i.MX 8M Plus has a register for controlling the LVDS physical interface output.
In the LVDS_CTRL register there is adjustment for example for:
Bandgap adjustment
Output transition time adjustment (slew rate)
Output current adjustment
Output common mode(Vos) adjustment
Pre-emphasis adjustment.
The reference manual (IMX8MPRM) and datasheet (MX8MPCEC) does no explain in detail what the LVDS_CTR register bits do.
Is there any detailed electrical specification for the LVDS interface and how the LVDS_CTR options change the output?
I have already mailed to you, pls check it
Hi joanxie,
I am an i.MX8 PE who handle CQC. I would like to know the detail definition of each bit of LVDS_CTRL register. Especially of below bits because we got 3 CQC units which have display issue with setting 000000 (in uboot) but okay with 100101 (in kernel). Please send me the document if you still have. My email is xin.fang@nxp.com. Thank you in advance!
Program CP with TST[5:2] and LF with TST[1:0](Default:100101)