rgb data processing

Hi

I want to draw a rectangle(100x100) in the rgb video stream line (640x480) in dsp builder.

So to achieve this, I write code in vhdl and import that file in subsystem builder block in dsp builder. rgb data is not transfering at every clock so I connected valid signal of the data stream line as a clock to vhdl imported file(rectangle).

Data Bus: 8bit.

Valid signal : 1bit

Note: Data Bus and valid signal are separate buses.

But I can not get the required output at the Display(LCD Display).

further I do not know whether I should counter hsync, vsync, front porch, back porch and blanking signals in the data stream line(when the data is in the DSP Builder).

please tell me what mistake I have done here?

I have attached rectangle1.vhd file with this post.

I have also attached the Results of rectangle code along with the code.

Thank You