please help to configure DM6446+THS8200 vga output setting

king huang

Prodigy 30 points

Other Parts Discussed in Thread: THS8200

Dear Sir:

as title, our dm6446 platform use ths8200 as the vga output. that is, the entire video path is :

dm6446 -> ycc16( output is ycc16) -> ths8200 -> VGA.

no matter how i try to configure the dm6446 or ths8200, the video sync timing is incorrect ?

can anyone tell me how to configure the FID pin of ths8200 ? ( according to the SPEC of dm6446 & ths8200, the DM6446 LCD_OE signal should connect to THS8200 FID pin as the valid data period ? is this right ?)

B.R.

King

over 16 years ago

0 Juan Gonzales over 16 years ago

TI__Mastermind 37340 points

You should be connecting LCD_FIELD pin on DM6446 to FID pin on THS8200 as shown on Figure 12 in the following App Note http://focus.ti.com/lit/an/spraan0/spraan0.pdf; this app note may also be helpful in understanding and configuring VGA output out of DM6446.

0 king huang over 16 years ago in reply to Juan Gonzales

Prodigy 30 points

Dear Sir:

in fact, our VGA output always have some green color regon which seems not a valid data area.

it just seems the blanking interval area all treat as valid data by ths8200.

Please reference

http://focus.ti.com.cn/cn/lit/ug/sprue37c/sprue37c.pdf about page P31,32 & P90

if dm6446 don't output LCD_OE signal, how do ths8200 know where is the start of valid data from data bus ?

or ths8200 just sample data after hsync signal ? so that's why the blanking interval be treated as valid data ?

0 Juan Gonzales over 16 years ago in reply to king huang

TI__Mastermind 37340 points

king huang said:

or ths8200 just sample data after hsync signal ? so that's why the blanking interval be treated as valid data ?

Yes, I believe this is the case.

Processors

Processors forum

please help to configure DM6446+THS8200 vga output setting