In a hierarchy of layered applications and corresponding protocols, a port and protocol sharing method is disclosed. Dirty pixel data indicative of which pixels within the tile memory are dirty pixels storing new pixel values and which pixels within the tile memory are clean pixels not storing new pixel values is also formed. The entered digits are stored as a string and compared to the entries stored in the directory. Node traversal is initiated but its extent is limited by a fixed bit-budget. Many such CPUs have architectures that may cause in certain applications an unbalance between read and write traffic on the independent busses. The signal line driver TCP has a plurality of slits in the film substrate thereof and bent at the slits, allow the signal line drive board to be located on the rear side of the backlight unit of the LCD device.