Is there a avalon master interrupt receiver template?

I want to display a image on the LCD through my LCD_CORE,in my design the SRAM is used as frame buffer,so I must to send the data of a image to the SRAM.

I used to use the UART to receive the data,and the DMA read it and write that to the SRAM when there is an interrupt generated by the UART,but the data is stored in the high 8 bit of the SRAM everytime.So I want to edit a component which is used to buffer the data.

I imagine that the component read the data from the UART when there is a interrupt generated,the component combine two 8bit data to a 16 bit data and generate an interrupt when the component achieved that.then the DMA read the 16 bit data from the component and write it to the SRAM.

I am not sure it is right.

thank you very much!