unit for DM6446 VPBE Digital LCD Timings: HSPLS/HINT/HSTART/HVALID

George Hou

Prodigy 125 points

Hi,

I have read some posts related with the VPBE Digital LCD Timing, but I am still confused about it, so i need some help.

In VPBE user guide, it said that the unit is the enc clock that is VENC clock.

In my DM6446 board, VENC clock is set to 27MHZ and DCLK for my LCD panel is 6.75MHZ and the LCD resolution is

240x320. So if the user guide is right, the value of HVALID should be 4*240, not 240. Is there anyone here could tell

me the right answer of HVALID value?

I will be appreciated for any help,

Thank you,

htbegin

over 15 years ago

0 Paul.Yin over 15 years ago

TI__Genius 14405 points

By DCLK, I am assuming you meant the VCLK output that's generated internally by DM6446 VENC.

I believe HVALID should be in terms of DCLK.

0 George Hou over 15 years ago in reply to Paul.Yin

Prodigy 125 points

Thanks for your reply.

I will try the HVALID cfg once I got a LCD Panel.

0 George Hou over 14 years ago in reply to Paul.Yin

Prodigy 125 points

I have tried the cfg of HVALID/HSPLS/HINT/HSTART，the datasheet is right the unit of them is ENC clock, not VCLK. So if the ENC clock is 27MHz, VCLK is 13.5MHZ, and HVALID should be 2*x_res, not x_res.

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unit for DM6446 VPBE Digital LCD Timings: HSPLS/HINT/HSTART/HVALID