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Hi TI team
I have a question, did the DS90CF386 support revceive a resolution 1280*720p@60hz which ODCK is about 74.25Mhz.
I noticed the datasheet support list do not include it
this is the datasheet description: Supports VGA, SVGA, XGA, and Single Pixel SXGA/// 20-MHz to 85-MHz Shift Clock Support
I find all these supported format is a 4:3 format, not a 16:9?
thanks!
Hi Jeckson,
Thank you for the question. Actually, the availability of image would be determined by PCLK (total pixels * refresh rate), not aspect ratio. I think it is available since the desired PCLK is in the DS90CF386 pixel clock range.
Regards,
Josh
Hi Josh
Thank you for your answer,why I asked such a question,because I have a related problem about this .
We use a DS90CF386 to receive lvds from SOC ,transform LVDS TO RGB888 to DLP chip DLPC3435 (support 1280*720p@60hz max),this is the condition.
when we config the SOC to output a 1280*720p@60hz resolution to DS90CF386,we find the screen will not display all the size of it,as the picture shows below:red rectangle shows
then we use an oscilloscope to probe the HSYNC/ DE/ DATA(R0);this is the result:
Blue :HSYNC / Purple : DE/ Yellow : R0 DATA,
we find that when DE goes low ,there is a blank data area before it ,
then we use a 1024*768p@60hz resolution ,we find the horizontal screen can display all as the picture shows below:
( the vertical is still not ocupied full as the red rectangle shows)
also we probe the the HSYNC/ DE/ DATA(R0),the result shows below:
Blue :HSYNC / Red : DE/ Yellow : R0 DATA, this time we find DE and DATA will horizontal align and the screen can show all horizontal pixel
So we still doubt that DS90CF386 is suitable for 4:3 format ,and can not translate a 16:9 format normally??
Thanks !
Hi Jeckson,
1280*720p@60hz which ODCK is about 74.25Mhz.
Could you clarify that blanking is considered PCLK 74.25MHz since 1280*720*60 is ~55MHZ?
Regards,
Josh
Hi Josh
Thank you for your help,Yes, I think blank is considered.
this is the 1280*720p@60hz parameter:
#timming
h_active=1280
v_active=720
h_period=1650
v_period=760
hsync_width=40
hsync_bp=110
hsync_pol=0
vsync_width=5
vsync_bp=25
vsync_pol=0
the clk= 1650*760*60 =74.24Mhz
Hi Jeckson,
Regards,
Josh