Samsung S3C2451X User Manual page 541

S3C2451X RISC MICROPROCESSOR
22
OVERVIEW
The LCD controller consists of logic for transferring image data from a video buffer located in system memory to
an external LCD driver interface. LCD driver interface has two kind of interface. One is conventional RGB-
interface and the other is i80-System interface. The LCD controller supports up to two overlay image windows,
which support various color format, 16 level alpha blending, color key, x-y position control, soft scrolling, variable
window size, and etc.
The LCD controller can support the various requirements on the screen related to the number of horizontal and
vertical pixels, data line width for the data interface, interface timing, and refresh rate.
The LCD controller transfers the video data from the frame buffer and generates the necessary control signals
such as, RGB_VSYNC, RGB_HSYNC, RGB_VCLK, RGB_VDEN, and SYS_CS0.... As well as the control signals,
LCD controller has the data ports for video data, which are RGB_VD[23:0] and SYS_VD[17:0] as shown in Figure
22-1.
LCD CONTROLLER
Figure 22-1. LCD Controller Block diagram
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
LCD CONTROLLER
22-1