DS90UB948-Q1: How to enable ds90ub948 pattern generator function

Hello Sirs,

Our product is LCD monitor for car. And it work fine with ds90ub947.

Now we want to enable pattern generation and follow this app note both section 4.2  and 4.3

http://www.ti.com/lit/an/snla132c/snla132c.pdf

We always can't get any output swing( measure LVDS CLK_out ) . Keep DC level at 1.2V.

Is there anything need to take care ?

For section 4.2 , just need two i2c command write then we should get default 800x480 timing,right ? As my understanding is "yes"

Why we still can't see LVDS_CLK frequency ??

0x65, 0x03,

0x64, 0x11,

Need your experience sharing about this. Many thanks ~