About DS90UB925Q and DS90UB926Q Evaluation Module

Dear sirs

I use DS90UB925Q and DS90UB926Q Evaluation Module like the following configuration.

When I use DS90UB925Q  internal pattern mode, the DS90UB926Q output is fine. (RGB[7:0],HS,VS,DE,PCLK)

When I use DS90UB925Q  external mode (signal from HOST Processor), the DS90UB926Q DE output is not working  (still low level).

But others output is fine. ( RGB[7:0],HS,VS,PCLK )

I try to set the DE input of DS90UB925Q high. But  the DS90UB926Q DE output is not working (still low level).

Do I need to set some register? Could you give me some suggestion?

Thanks

BRS

Nat