CS9211 datasheet(16/62 Pages) NSC

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Revision 2.1

Functional Description (Continued)

3.2

FUNCTIONAL BLOCKS

The block diagram of the CS9211, along with the basic sys-

tem interconnections are shown in Figure 3-4. Details of

each block will be discussed in this section.

The CS9211 interfaces directly to industry standard 8-, 16-

and 24-bit color or monochrome single or dual-scan STN

flat panels (not all combinations are supported). It can also

support 18-bit active matrix thin-film-transistor (TFT) with

one or two pixels per clock.

The digital RGB or video data that is supplied by the

CS5530A is converted into a suitable format to drive the

supported panels. The heart of the device is the Frame

Rate Modulator (FRM), which provides the ability to display

various intensities of each primary color. Dithering logic is

included to further increase the apparent number of colors

that can be displayed. To support the DSTN panels, a

memory controller that interfaces to external EDO DRAM

or SDRAM (used as a frame buffer) is built into the

CS9211. A configurable timing generator provides timing

pulses tailored to the panel being driven. The CS9211 sup-

ports automatic power sequence of panel power supplies.

The device contains a CRC generator which may be used

for self-validation during silicon validation.

Each pixel on an SSTN or DSTN LCD panel consists of

three primary color components: red, green, and blue.

Each primary color component, for a given pixel, can be

turned on or off; there are no intermediate intensities. A

total of eight colors can be generated for a given pixel

through various combinations of turning each color compo-

nent on or off. In order to generate more colors, frame rate

modulation and dithering are used. The CS9211 is capable

of generating 256K different colors, based on the 18-bit

RGB pixel inputs.

Figure 3-4. CS9211 Block Diagram

Dither

DRAM/SDRAM

Serial-IF/Register Block

Memory

Panel

FRM

TFT

DSTN/

Interface

Controller

DSTN

Timing

Generator

TFT,

SSTN,

DSTN

XGA

Geode™

CRC

Engine

CS5530A

Panel

I/O

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